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创刊时间:1975年
主管:中华人民共和国工业和信息化部
主办:工业和信息化部电信传输研究所
主编:韩 玲
出版周期:月刊
ISSN:1008-9217
CN:11-2977/TN
邮发代号:82-949
国外代号:M1683 地址:北京市海淀区花园北路52号
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Email:tgzy@ritt.cn
 
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  • Table of Content
      20 December 2020, Volume 44 Issue 12 Previous Issue    Next Issue
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    Progress and Prospect for Development and Application ofMicroalloying Press-Hardening Steel
    LU Hongzhou, ZHAO Yan, FENG Yi, MA Mingtu, BIAN Jian, LIU Yonggang, GUO Aimin
    Materials For Mechanical Engineering. 2020, 44 (12): 1-10.   DOI: 10.11973/jxgccl202012001
    Abstract   PDF (1853KB) ( 8 )
    Ultra-high strength steels are important materials for the lightweight and safety of motor vehicles. The development and application of 1.5 GPa and above grade high-performance press-hardening steel are the key. In recent 10 a, the manufacturing technology of microalloying press-hardening steels and their parts have developed rapidly, achieving the performance such as high bending angles, hydrogen embrittlement resistance, high toughness and high hardenability; therefore the passive safety performance and lightweight of vehicles are improved. The development and application status of microalloying press-hardening steels are summarized, including the development and application of 1.5-2.0 GPa grade Nb microalloying, V microalloying, Nb-V composite microalloying and Nb-V(Mo) composite microalloying press-hardening steels, and the effects of microalloying on the nanoscale second phase precipitation and grain refinement; the hydrogen embrittlement resistance and its mechanism of microalloying press-hardening steels; the sharp corner cold bending property of microalloying press-hardening steels and its influence on the collision safety performance; the fracture failure performance of microalloying press-hardening steels. The manufacture and application of microalloying press-hardening steels in the future are also prospected.
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    Research Process of Formation Law, Microstructure Evolution andResidual Stress in Wire and Arc Additive Manufacturing
    GENG Ruwei, DU Jun, WEI Zhengying
    Materials For Mechanical Engineering. 2020, 44 (12): 11-17.   DOI: 10.11973/jxgccl202012002
    Abstract   PDF (535KB) ( 73 )
    The wire and arc additive manufacturing (WAAM) has gained more and more attention because of its unique advantages in forming large-scale components, and has become one of the most widely used metal additive manufacturing technology. The development history of WAAM is described. The influence of process parameters on the morphology of deposited layer and the evolution mechanism of microstructure is analyzed from the perspective of “shape and property control”. The numerical simulation methods for residual stress and their advantages and disadvantages are discussed, and it is pointed out that the combination of computational fluid dynamics and finite element method is one future research trend. The common methods for controling the residual stress and deformation, as well as the problems and challenges in wire and arc additive manufacturing, are summarized.
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    Effect of Pin Length on Microstructure and Properties of FrictionStir Welded Joint of 2A14 Aluminum Alloy Lock Bottom Structure
    SONG Jianling, ZHAO Yingjie, SUN Guangda, LIANG Tao, ZHOU Li
    Materials For Mechanical Engineering. 2020, 44 (12): 18-23,46.   DOI: 10.11973/jxgccl202012003
    Abstract   PDF (7083KB) ( 3 )
    Friction stir welding was performed on a lock bottom structure (groove depth of 6 mm) composed of an annealed fork ring and a quenched and artificial aged short shell of 2A14 aluminum alloy. The influence of pin length (4.0-7.0 mm) on microstructure and properties of the joint was studied. The results show that incomplete penetration defects existed at the root of the joint when the pin length was less than 6.0 mm, and the “Hook” defect appeared on the edge of the weld on the side of the short shell when the pin lenght was no less than 6.0 mm. With increasing pin length, the height of the “Hook” increased. With increasing pin length, the grain size of the weld nugget zone decreased first and then increased, and the tensile properties increased first and then decreased. When the pin length was 6.0 mm, the grain size of the weld nugget zone was the smallest, the hardness was the highest and the tensile properties was the best. When the pin length was 4.0 mm, the tensile fracture of the joint showed delamination, and the joint had a mixed fracture mode of quasi-cleavage and dimple fracture. When the pin length was no less than 6.0 mm, the joint showed ductile fracture.
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    Microstructure and Nanoindentation Mechanical Properties of WS2 Film withDifferent Doping Elements by Magnetron Sputtering
    HE Jiangtao, CAI Haichao, XUE Yujun, YANG Fang, MA Xiqiang
    Materials For Mechanical Engineering. 2020, 44 (12): 24-28,36.   DOI: 10.11973/jxgccl202012004
    Abstract   PDF (4069KB) ( 24 )
    The WS2 film, Ti/WS2 composite film and La-Ti/WS2 composite film were prepared by magnetron sputtering under different deposition pressures (0.8, 1.2 Pa). The microstructure and nanoindentation mechanical properties of the films were studied. The results show that the WS2 film had a loose and porous structure with coarse grains and many pores; the density of microstructure was poor. Compared with those of the WS2 film, the grain size of the Ti/WS2 composite film was reduced and the structure was densified. The doping of lanthanum further reduced the grain size of the film, and the microstructure was more compact. The doping of lanthanum also reduced the atomic ratio of sulfur to tungsten in the film, increased the relative content of the hard tungsten phase, and finally increased the hardness and deformation resistance of the film.
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    Microstructure and Properties of Cu-Ag Alloy after Annealing at Different Temperatures
    KONG Lingbao, ZHOU Yanjun, SONG Kexing, CAO Jun, Lü Changchun, LI Ke, LIU Qingbin, WU Baoan, TANG Huiyi, ZHANG Xuebin, HUANG Tao
    Materials For Mechanical Engineering. 2020, 44 (12): 29-32.   DOI: 10.11973/jxgccl202012005
    Abstract   PDF (2875KB) ( 23 )
    The Cu-4Ag and Cu-20Ag alloys were prepared by continuous casting combining with cold drawing and intermediate softening treatment. The microstructure, hardness and conductivity of the alloys annealed at different temperatures (440,480,520 ℃) were studied. The results show that after annealing, the rich-silver phase had fine-particle-like shapes fine and continuous network structures on the cross section of the Cu-4Ag and Cu-20Ag alloys, respectively. On the longitudinal section of the alloys, the rich-silver phase was fibrous. The Cu-20Ag alloy had more rich-silver phase, higher hardness and lower conductivity compared with Cu-4Ag alloy. The hardness of the two alloys decreased and the conductivity increased with increasing annealing temperature. The conductivity and hardness of the two alloys were the closest after annealing at 480 ℃. The conductivity and hardness of the Cu-20Ag alloy got the best match when annealed at 480 ℃.
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    Microstructure and Tensile Properties of Heat Affected Zone bySimulation Welding of Service-Degraded HP40Nb Furnace Tube
    LI Songlin, CAO Luowei, HAN Zhiyuan, CHENG Fangjie
    Materials For Mechanical Engineering. 2020, 44 (12): 33-36.   DOI: 10.11973/jxgccl202012006
    Abstract   PDF (1579KB) ( 2 )
    The microstructure and tensile properties of the heat affected zone of a service-degraded HP40Nb hydrogen production convert furnace tube were studied by the welding thermal simulation. The results show that coarse and continuous G phase and chromium-rich M23C6 carbides existed on austenite grain boundaries in the service-degraded furnace tube. After thermal cycling at peak temperature of 1 100-1 200 ℃, the precipitates still consisted of G phase and M23C6 carbides, and both decreased in content with increasing peak temperature. When the peak temperature was 1 250 ℃, the precipitates were composed of M23C6 and NbC phases. The tensile strength and elongation of the heat affected zone samples obtained at lower peak temperatures (950-1 050 ℃) were lower. When the peak temperature was higher than 1 100 ℃, the tensile strength and elongation increased with increasing temperature. When the peak temperature increased to 1 150 ℃ and above, the tensile strength reached the requirements of the unserviced HP40Nb alloy, while the elongation was smaller than the standard requirement.
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    Effect of Addition of Aluminum and Silicon Elements on Microstructure and Properties of TiN-based Film
    GUO Liming, DUAN Lili, YU Xiaofeng, WU Hua
    Materials For Mechanical Engineering. 2020, 44 (12): 37-41.   DOI: 10.11973/jxgccl202012007
    Abstract   PDF (1951KB) ( 21 )
    Three films of TiN, Ti-Al-N and Ti-Si-N were prepared by physical vapor deposition (PVD). The influence of aluminum and silicon addition on microstructure and properties of films was studied. The results show that the Ti3AlN phase existed preferred orientatian in microstructure of Ti-Al-N film, and a coarse columnar crystal microstructure formed. The Si3N4 phase formed in Ti-Si-N film, and the microstructure of Ti-Si-N film was more fine. The film base bonding force was the smallest of Ti-Al-N film and was the largest of Ti-Si-N film. The Ti-Al-N film had the smallest surface roughness and the largest hardness and elastic modulus.The friction factor of Ti-Si-N film was slightly higher than that of Ti-Al-N film, but the difference between them was small, which should be related to the fact that the microstructure of Ti-Si-N film was fine, and Si3N4 phase formed by Ti-Si-N film had a certain self-lubricating property.
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    Corrosion Behavior of Super High Strength Steel FG20 in High-Sulfur Oilfield Water with Different pH Values
    WANG Zhiqiang, HUANG Xiaoguang, GUO Tingshun, PEI Zhaohua
    Materials For Mechanical Engineering. 2020, 44 (12): 42-46.   DOI: 10.11973/jxgccl202012008
    Abstract   PDF (2157KB) ( 2 )
    Electrochemical corrosion and indoor coupon corrosion experiments were used to study the corrosion behavior of super high strength steel FG20 for sucker rods in high-sulfur oilfield water with different pH values. The results show that with the increase of pH value of the oilfield water, the free corrosion potential, free corrosion current density and corrosion rate of the FG20 steel decreased. With the increase of pH value of the oilfield water, the corrosion products on the surface of the FG20 steel changed from loose and cracked FeS layers to the dense FeCO3 and Fe2O3 layers, enhancing the corrosion resistance of the FG20 steel surface.
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    Effect of Annealing Process on Microstructure and Properties ofStainless Steel Applied in Architectural Decoration
    HUANG Lei, SUN Yanjun, WU Hao
    Materials For Mechanical Engineering. 2020, 44 (12): 47-52.   DOI: 10.11973/jxgccl202012009
    Abstract   PDF (7039KB) ( 1 )
    10Cr17 stainless steel was annealed in low temperature (840, 880 ℃) single phase region and high temperature (950, 1 000, 1 050, 1 100 ℃) dual phase region, and then cooled to room temperature by air and water cooling. The effect of annealing temperature and cooling method on microstructure, mechanical properties and corrosion resistance of 10Cr17 stainless steel was investigated. The results show that the annealed microstructure of the test steel at low temperatures (840, 880 ℃) was ferrite and (Fe,Cr)23C6 carbide, and at high temperatures (950~1 100 ℃) was ferrite, martensite and (Fe,Cr)23C6 carbide. When the temperature reached 1 000 ℃ and above, complete dynamic recrystallization occurred, and the recrystallized grain size by water cooling was smaller than that by air cooling. Comparing with the low temperature annealed steel, high temperature annealed test steel had higher strength, worse plasticity and better corrosion resistance, and the corrosion resistance under high temperature annealing and water cooling conditions was better than that under high temperature annealing and air cooling conditions. The strength of the test steel by water cooling was higher than that by air cooling, while the plasticity was slightly lower. When the annealing temperature was 950 ℃, the test steel had good strength and plastic combination, and the best corrosion resistance.
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    Research and Development of SG90T-9C Slag-Gas Bonded Protection Flux Cored Welding Material with High Strength and Toughness
    ZHANG Nan, TIAN Zhiling, ZHANG Shuyan, ZHANG Feihu
    Materials For Mechanical Engineering. 2020, 44 (12): 53-61.   DOI: 10.11973/jxgccl202012010
    Abstract   PDF (9141KB) ( 1 )
    A rutile type SG90T-9C slag-gas bonded protection flux cored welding wire was developed. The effect of the amount of silicon and manganese on microstructure and properties of the welding wire deposited metal and weld metal by welding Q960E steel was studied. The effect of heat input on morphology of M/A island in the weld microstructure was studied. The comprehensive properties of SG90T-9C welding wire were compared with CHT91K2, ESAB91K2 welding wires and H08Mn2SiA welding wire coupling HJ431 flux. The results show that with increasing manganese and silicon addition, the tensile strength of the deposited metal increased, and the impact toughness increased and then decreased. With increasing heat input, the M/A island shape changed from point to block and the island gathered on boundaries. The heat input should be controlled within 10 kJ·cm-1. Compared with other welding materials, the SG90T-9C welding wire deposited metal had excellent mechanical properties, the weld quality by welding Q960E steel was better, and the porosity and repair rate by welding Q960E steel frame reduced significantly.
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    Effect of Shot Peening on Residual Stress and Microstructure ofAl18B4O33 Whisker Reinforced Aluminum Matrix Composite
    WU Yihan, JIANG Chuanhai
    Materials For Mechanical Engineering. 2020, 44 (12): 62-66.   DOI: 10.11973/jxgccl202012011
    Abstract   PDF (1134KB) ( 12 )
    Conventional (room temperature) and warm (200 ℃) shot peening treatments were performed on Al18B4O33 whisker reinforced aluminum matrix composite, and the residual stress distribution of the surface layer after shot peening was studied. The microstructure of the surface layer was investigated by X-ray diffraction profile analysis and the microhardness was also studied. The results show that the residual compressive stress of the surface layer of the composite after shot peening increased first and then decreased with increasing distance from the surface (depth); the residual compressive stress after warm shot peening was greater than that after conventional shot peening. The domain size of the surface layer increased with the depth after shot peening, and the microstrain decreased; the domain size and microstrain after warm peening were both smaller than those after conventional shot peening. The dislocation density and microhardness of the surface layer decreased with increasing depth after shot peening, and the dislocation density and the microhardness after warm peening were higher than those after conventional shot peening.
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    Fatigue Properties of Al-12Si-CuNiMg Cast Aluminum Silicon Alloy under Multi-axial Loading
    LIU Xiaoyong, ZHANG Yi
    Materials For Mechanical Engineering. 2020, 44 (12): 67-70.   DOI: 10.11973/jxgccl202012012
    Abstract   PDF (1841KB) ( 1 )
    The Al-12Si-CuNiMg cast aluminum silicon alloy was subjected to proportional and 90° nonproportional multi-axial loading fatigue test under 160, 150, 140 MPa equivalent stress amplitudes. The fatigue life of the specimen was tested. The prediction accuracy of fatigue lives under two loading modes by the maximum principal stress model and the critical surface damage parameter Matake model was compared. The fatigue fracture was analyzed. The results show that under the same equivalent stress amplitude, the fatigue life of the non-proportional loaded specimen was much lower than that of the proportional loaded specimen. The fatigue lives estimated by the maximum principal stress model and the Matake model both had high accuracy under proportional loading. Under nonproportional loading, the fatigue lives estimated by the maximum principal stress model had larger errors while those by the Matake model still had high accuracy. The Matake model model was suitable for multi-axial loading fatigue life estimation of this material. The alloy under nonproportional multi-axial loading showed brittle fracture. The crack source was at the oxide inclusions near the surface, and the crack propagation region showed quasi-cleavage transgranular fracture, accompaning with secondary cracks.
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    Structure and Properties of Rock Wool Fiber Reinforced SiO2 Aerogel Composite Thermal Insulation Material After Accelerated Aging
    XIAO Shuhua, FAN Jinjuan
    Materials For Mechanical Engineering. 2020, 44 (12): 71-74,84.   DOI: 10.11973/jxgccl202012013
    Abstract   PDF (2593KB) ( 3 )
    The rock wool fiber reinforced SiO2 aerogel composite thermal insulation material was subjected to accelerated aging tests for different times (1-15 d) at 600 ℃. The microstructure, compression performance and thermal conduction performance were studied after aging. The results show that with increasing aging time, the aerogel filled in the rock wool fiber grid space agglomerated, and the fracture degree of fiber increased. When the aging time was 15 d, the aerogel was in a sintered state, and the structure was dense. The stress of the unaged sample changed linearly with strain. The stress of the aged sample increased faster than that of the unaged sample. The stress increased fastest with strain when the aging time was 15 d. With increasing aging time, the heat transfer path of the sample became shorter, and the thermal conductivity coefficient increased.
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    Thermal Deformation Behavior of 0.5% Graphene ReinforcedAluminum Composite
    LOU Shumei, GUO Guangxin, LIU Yongqiang, ZHANG Pingping
    Materials For Mechanical Engineering. 2020, 44 (12): 75-79.   DOI: 10.11973/jxgccl202012014
    Abstract   PDF (2565KB) ( 3 )
    Thermal compression simulation tests of 0.5% graphene reinforced aluminum composite were carried out under conditions of deformation temperature of 330-450 ℃ and strain rate of 0.01-10 s-1, and the thermal deformation behavior of the composite was studied. The constitutive equation considering the strain compensation was established with the flow data. The processing map was constructed by the dynamic material model, and the optimal parameter range was determined. The finite element simulation of the thermal extrusion of the material was conducted with a set of optimal parameters. The results show that the true stress-strain curves of the composite under different thermal deformation conditions showed the characteristics of first rise, then fall, and finally tending to be stable. The peak stress decreased with incresing deformation temperature and decreasing strain rate. The optimal deformation temperature of the composite was 410-430 ℃, and the strain rate was 0.01-0.016 s-1. The finite element simulation showed that the extruded composite profiles had relatively good performance at with deformation temperature of 420 ℃ and strain rate of 0.01 s-1.
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    Dynamic Mechanical Properties and Constitutive Relation of TC8 Titanium Alloy
    CAI Ming, CHEN Wei, CHEN Liqiang, ZHAO Zhenhua, LIU Lulu
    Materials For Mechanical Engineering. 2020, 44 (12): 80-84.   DOI: 10.11973/jxgccl202012015
    Abstract   PDF (1841KB) ( 4 )
    TC8 titanium alloy was subjected to room temperature quasi-static tensile tests at different strain rates (0.000 1, 0.001, 0.01 s-1) and dynamic compression tests at different strain rates and temperatures on the Hopkinson pressure bar device. The quasi-static and dynamic mechanical properties of the alloy were studied. The test data was fitted to obtain the parameters and then J-C constitutive model was established. The constitutive model was verified by tests. The results show that the yield strength, tensile strength and maximum equivalent failure plastic strain of TC8 titanium alloy all increased with increasing strain rate in the quasi-static tensile tests. The yield strength and ultimate strength of the alloy increased with increasing strain rate in the room temperature dynamic compression test, exhibiting an obvious strain rate strengthening effect; the yield strength and ultimate strength decreased with increasing temperature, exhibiting a significant temperature softening effect. The true stress-true strain curve calculated by the fitted J-C constitutive equation was consistent with the test results, and the average relative error was 4.82%, indicating that the constitutive model could predict the dynamic mechanical properties of TC8 titanium alloy at high temperature.
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    Finite Element Simulation of In-plane Shear of Carbon Fiber Reinforced Plastic Laminates with Two Material Models of LS-DYNA Software
    MENG Xianming, ZHONG Zheng, CHENG Congqian, CAO Tieshan, ZHAO Jie, HUANG Yafeng, WU Yao
    Materials For Mechanical Engineering. 2020, 44 (12): 85-90,96.   DOI: 10.11973/jxgccl202012016
    Abstract   PDF (2969KB) ( 156 )
    The progressive failure model of fiber reinforced plastics and the continuous damage model of composite laminate of the Ls-Dyna software were applied to simulate the mechanical response and damage modes of carbon fiber reinforced plastic laminates under in-plane shear loads, with the mechanical parameters obtained by quasi-static uniaxial tensile and in-plane shear tests. The applicability of the two models was compared. The results show that in the initial linear elastic stage during in-plane shearing, the two models could simulate the mechanical characteristics of the carbon fiber reinforced plastic laminates. As the load continued to increase, the load-displacement simulation curve obtained by the progressive failure model still rose linearly, and dropped rapidly after reaching the load peak; the simulation curve had a large deviation from the test curve. When the material was damaged, because of the introduction of damage parameters, the load-displacement simulation curve obtained by the continuous damage model was nonlinear, which was in good agreement with the test curve.
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    3D Modeling Method and Simulation for Mechanical Properties of Foam Metal Sandwich Panel
    QU Xiangsheng, WANG Lihua, JU Yan, LIU Dawei, ZHANG Hualin, ZHU Zhengjiang, HU Yuebo
    Materials For Mechanical Engineering. 2020, 44 (12): 91-96.   DOI: 10.11973/jxgccl202012017
    Abstract   PDF (2639KB) ( 1 )
    The establishment of a 3D random model of foam metal sandwich panel based on MATLAB software was described in detail. The quasi-static compression performance of the foam metal sandwich panel was simulated by ANSYS finite element software, and was compared with the test results. The dynamic mechanical properties of the foam aluminum sandwich panel under impact load were studied by the established 3D random model. The results show that the quasi-static compression true stress-true strain curves simulated by the random model were basically consistent with the test results, all having elastic stage, yield stage and compaction stage; the relative error was smaller than 10%, verifying the effectiveness and reliability of the model. After impact at the same initial velocity (80, 100, 200 m·s-1), the peak stress and absorbed energy of the foam aluminum sandwich panel with porosity of 60% were lower than those with porosity of 50%. The peak initial stress, platform stress and the absorbed energy of the foam aluminum sandwich panel with the same porosity increased with initial impact velocity.
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    Influence of Welding Defects on Bearing Capacity of Brazed AluminumHoneycomb Panel under Different Compression Conditions
    ZHAO Jie, ZHANG Juan, JIANG Xiaoqin, CHANG Shuxin, XIAO Shoune
    Materials For Mechanical Engineering. 2020, 44 (12): 97-102.   DOI: 10.11973/jxgccl202012018
    Abstract   PDF (3594KB) ( 1 )
    The finite element model of the honeycomb panel was established, and load-bearing response behavior of honeycomb panel under conditions of flat compression and lateral compression was simulated. The results were verified by experiments. With the finite element model, the influence of welding defects on the bearing capacity of honeycomb panel was studied by introducing the core layer wall debonding and the poor welding defects between panel and core layer. The results show that the honeycomb panel failed by buckling of the core layer under flat compression. Under lateral compression, the honeycomb panel failed by the combination of partial splitting between the panel and core layer, and buckling of the panel. The simulation of the load-displacement curves were in good agreement with the test results under two compression conditions, and the relative errors of the maximun loads were lower than 10%. Under flat compression, the more number of desoldering between the core layer walls the smaller the bearing capacity of brazed aluminum honeycomb panel. Under the lateral compression, the larger the size of the welding defect area, the smaller the maximum bearing capacity of the honeycomb panel, and the easier the structure failure.
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    Reason for White Spot Defect on Surface of Zr-3 Zirconium Alloy Sheet
    YUE Qiang, XU Bin, HU Xukun, ZHAO Linke
    Materials For Mechanical Engineering. 2020, 44 (12): 103-106.   DOI: 10.11973/jxgccl202012019
    Abstract   PDF (2377KB) ( 3 )
    After surface treatment by resin wheel grinding and pickling in production, white spot appeared on surface of Zr-3 alloy slabs. The cause of the white spot was analyzed by chemical composition analysis, microstructure observation and residual stress test. The results show that the white spot was caused by excessive residual stresses. The white spot defect was eliminated by application of thousand impeller grinding or sand blasting to decrease surface residual stresses and reduce twin crystal formation.
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