小功率脉冲激光下飞机叶片的强化是现在急需解决的问题，本试验通过采用光纤传输300 W Nd：YAG脉冲激光熔覆系统，在低碳钢（SM400B）上熔覆Co基合金（Stellite-6）和碳化钒（VC）混合粉末（VC的质量分数变化范围为0~100%），并对熔覆层的性能进行了研究，从而探究小功率脉冲激光下飞机叶片强化的工艺。试验结果表明，随着VC质量分数的增加，熔覆层组织由亚共晶组织转变为过共晶组织。当VC质量分数小于80%时，熔覆层硬度、裂纹敏感性及耐磨性能随VC增加而增加；当VC质量分数大于80%时，由于母材的稀释作用，熔覆层硬度、裂纹敏感性及耐磨性能随VC增加而降低。试验表明，使用Co基合金（Stellite-6）和碳化钒（VC）混合粉末可以形成耐磨性好、硬度高，裂纹敏感性低的熔覆层，对飞机叶片产生较好的强化效果。
徐国建
,
杨文奇
,
杭争翔
,
刘祥宇
,
迟海龙
,
欧雪松
. Stellite-6+VC混合粉末激光熔覆性能的研究[J]. 机械工程学报, 2017
, 53(14)
: 165
-170
.
DOI: 10.3901/JME.2017.14.165
The enhancement of the blade of aircraft with small power pulse laser is an urgent problem to be solved.Pulse 300W Nd:YAG laser facility is used for cladding in this experiment,and Stellite 6 alloy and VC mixed powder are cladded on mild steel (SM400B) plate. Shape of clad layer, microstructure and performance of clad layer are investigated by changing the weight fraction of VC in the range of 0 to 100% to research the process of strengthening the blade of aircraft with small power pulse laser. The experimental results demonstrate that with the increase of the content of VC, the microstructure of the cladding layer is changed from the eutectic structure to the eutectic structure. The hardness, crack sensitivity and wear resistance of the cladding layer are increased with the increase of VC when the content of VC is less than 80%, and when the weight of VC is more than 80%, the hardness, crack sensitivity and wear resistance of the cladding layer decrease with the increase of VC due to dilution effect of parent material.The results show that high quality cladding layer with good wear resistance,high hardness and low crack sensitivity can formed by using Co based alloy (Stellite-6) and vanadium carbide (VC) mixed powder,which can make a great effect in strengthening the blade of aircraft.
[1] KUSTSUNA M. The Characteristics of laser cladding and its application[J]. Welding Technique,1995,43(9):70-77.
[2] 徐国建,黄雪,傅新皓,等. Ni基合金与WC混合粉末的激光熔覆层组织[J]. 硬质合金,2012,29(5):297-308. XU Guojian,HUANG Xue,FU Xinhao,et al. Microstructure of laser cladding layer using mixed powder of Ni-based alloys + WC[J]. Cemented Carbide,2012,29(5):297-308.
[3] DUHOURG L,ARCHAMBEAULT J. Technological and scientific landscape of laser cladding process in 2007[J]. Surface & Coatings Technology,2008,202(24):5863-5869.
[4] STEEN W M. Laser material processing[M]. London:Springer Verlag,2003.
[5] READY J F. LIA handbook of laser material processing[M]. Orlando:The Laser Institute of America and Mangolia Publishing Inc.,2001.
[6] PAUL C P,ALEMOHAMMAD H,TOYSERKANI E,et al. Cladding of WC-12 Co on low carbon steel using a pulsed Nd:YAG laser[J]. Materials Science and Engineering A,2007,464:170-176.
[7] KUSTSUNA M. Laser surface processing of metals[J]. The Review of Laser Engineering,1991,22(9):32-47.
[8] ARAKI T. Recent thermal spraying surface modification by laser processing[J]. Welding Technique,1999,47(8):73-78.
[9] 徐国建,丁小粉,王志一,等. 蒸汽发电机叶片激光堆焊层的性能[J]. 沈阳工业大学学报,2014,36(3):269-274. XU Guojian,DING Xiaofen,WANG Zhiyi,et al. Performances of laser overlay cladding on blade of steam generator[J]. Journal of Shenyang University of Technology,2014,36(3):269-274.
[10] ANASOFIA C M,OLIVEIRA D,PAULO S C P,et al. Microstructural features of consecutive layers of Stellite 6 deposited by laser cladding[J]. Surface and Coatings Technology,2002,153(2-3):203-209.
[11] STEEN W M. Surface treatment of materials by laser beam[C]//Proceedings of ECLAT'88-European Conference on Laser Treatment of Materials,1988:60-63.
[12] TECHEL A,LUFT A,MULLER A,et al. Production of hard metal-like wear protection coatings by CO2 laser cladding[J]. Optical and Quantum Electron,1995,27(12):1313-1318.
[13] 王晓荣,王新洪,杜宝帅,等. 激光熔覆Fe-Ti-V-Cr-C合金涂层的微观组织和性能[J]. 材料工程,2011(3):50-54. WANG Xiaorong,WANG Xinhong,DU Baoshuai,et al. Microstructure and property of laser cladding Fe-Ti-V-Cr-C alloy coatings[J]. Journal of Materials Engineering,2011(3):50-54.
[14] 徐国建,殷德洋,杭争翔,等. 激光熔覆钴基合金与碳化钒的功能梯度层[J]. 激光与光电子学进展,2012,49(6):061404-1-061404-6. XU Guojian,YIN Deyang,HANG Zhengxiang,et al. Functionally gradient material coating of Co-based alloy and VC using laser cladding[J]. Laser & Optoectronics Progress,2012,49(6):061404-1-061404-6.
