The molybdenum alloy (MHC) and the nickel alloy (GH4099) were successfully joined with NiCrSiB as the interlayer by the Gleeble-3800 thermal simulated machine. Microstructure of MHC/GH4099 welded joints were characterized by scanning electron microscope (SEM), energy dispersive scanning (EDS) and X-ray diffraction (XRD). The effects of bonding temperature on microstructure and shear strength were also investigated. Results indicated that a reliable welded joint can be obtained at peak temperatures of 950 ℃，1 000 ℃ and 1 050 ℃ and holding time of 600 s. The MHC/GH4099 joints were mainly composed of γ-Ni solid solution, CrMo solid solution, MoNi and CrB, Ni3Si phase. The shear strength of the joint at 1 050 ℃ can reach 116 MPa. The larger stress concentration in the heat affected zone of MHC side was the main reason of brittle fracture for MHC/GH4099 joints.
CHE Hongyan
,
ZHENG Tianming
,
WANG Henglin
,
DONG Hao
,
YAN Yingjie
,
CAO Rui
. Microstructure and mechanical properties of thermal simulated MHC/GH4099 diffusion brazing joints[J]. Transactions of The China Welding Institution, 2021
, 42(9)
: 15
-20
.
DOI: 10.12073/j.hjxb.20210221001
[1] 王承阳, 董帝, 滕宇阔, 等. 退火工艺对MHC钼合金板材组织和力学性能的影响[J]. 金属热处理, 2018, 43(7): 180 ? 183
Wang Chengyang, Dong Di, Teng Yukuo, et al. Effect of annealing on microstructure and mechanical properties of MHC molybdenum alloy sheet[J]. Heat Treatment of Metals, 2018, 43(7): 180 ? 183
[2] 朱源, 张昊, 程晓瞳, 等. 镍箔中间层厚度对GH4099合金固相扩散焊质量的影响[J]. 焊接学报, 2018, 39(4): 93 ? 98
Zhu Yuan, Zhang Hao, Cheng Xiaotong, et al. Effect of nickel interlayer thickness on solid-state diffusion bonding quality of superalloy GH4099[J]. Transactions of the China Welding Institution, 2018, 39(4): 93 ? 98
[3] 王刚, 杨双全. Cu/GH4099钎焊接头组织及力学性能[J]. 焊接, 2019(2): 49 ? 53
Wang Gang, Yang Shuangquan. Microstructure and properties of Cu and GH4099 vacuum brazed joints[J]. Welding & Joining, 2019(2): 49 ? 53
[4] 王骥腾. Mo-Cu合金与GH4099高温合金真空钎焊接头微观结构及性能研究[D]. 济南: 山东大学, 2015.
Wang Jiteng. Microstructure and properties of vacuum brazed joint for Mo-Cu alloy and GH4099 superalloy[D]. Jinan: Shandong University, 2015.
[5] Zhang Jian, Shen Qiang, Luo Guoqiang, et al. Microstructure and bonding strength of diffusion welding of Mo/Cu joints with Ni interlayer[J]. Materials and Design, 2012, 39: 81 ? 86.
[6] Zhang Ping, Yuan Jinping, Meng Lingdong, et al. Effect of molybdenum on the microstructure and corrosive wear resistance of laser clad Ni-based coatings[J]. China Welding, 2010, 19(1): 43 ? 47.
[7] Ren Xueping, Li Shuxia, Xiong Zhiping. Isostatic diffusion bonding and post-solution treatment between Cr22Ni5Mo3MnSi and Cr30Ni7Mo3MnSi duplex stainless steels[J]. Journal of Manufacturing Processes, 2018, 34: 215 ? 224.
[8] 吴铭方, 司乃潮, 陈健. 铝/镀银层/钢的扩散钎焊及界面化合物的生长行为[J]. 中国有色金属学报, 2010, 20(6): 1209 ? 1213
Wu Mingfang, Si Naichao, Chen Jian. Diffusion brazing of Al/Ag plating layer/steel and growth behavior of interface compound[J]. The Chinese Journal of Nonferrous Metals, 2010, 20(6): 1209 ? 1213
[9] Ma Qunshuang, Li Yajiang, Wu Na, et al. Microstructure of vacuum-brazed joints of super-Ni/NiCr laminated composite using nickel-based amorphous filler metal[J]. Journal of Materials Engineering and Performance, 2013, 22(6): 1660 ? 1665.
[10] Tokoro K, Wikstrom N P, Ojo O A, et al. Variation in diffusion-induced solidification rate of liquated Ni-Cr-B insert during TLP bonding of Waspaloy superalloy[J]. Materials Science and Engineering A, 2008, 477(1-2): 311 ? 318.
[11] Idown O A, Richards N L, Chaturvedi M C. Effect of bonding temperature on isothermal solidification rate during transient liquid phase boding of Inconel 738LC superallo[J]. Materials Science and Engineering A, 2005, 397: 98 ? 112.
[12] Liaw D W, Shiue R K. Infrared brazing of Mo using the 70Au-22Ni-8Pd alloy[J]. International Journal of Refractory Metals and Hard Materials, 2005, 23(2): 91 ? 97.
[13] Chang C T, Shiue R K. Infrared brazing Ti-6Al-4V and Mo using the Ti-15Cu-15Ni braze alloy[J]. International Journal of Refractory Metals and Hard Materials, 2005, 23(3): 161 ? 170.
