Microstructure and properties of laser clad Ni-based self-lubricating coating on Ti6Al4V alloy

doi:10.13251/j.issn.0254-6051.2021.06.038

Abstract

Abstract: Ni-based self-lubrication clad layers consisting of Ni25+Ni-coated MoS₂ were fabricated on Ti6Al4V alloy by using fiber laser. The microstructure, phases composition and friction performance of the clad layers were studied by means of field emission scanning electron microscopy (FESEM), X-Ray diffraction (XRD), and friction and wear tester. The results show that the clad layer surface mainly consists of petaloid and a little dendrites, while the microstructure at the clad-layer/substrate interface is mainly dendritic with a small amount of equiaxed grains. Intermetallic compounds such as NiTi and NiTi₂ and some other compounds are formed, which can improve surface hardness of the clad layers effectively and make the hardness change from 180-200 HV0.3 of the substrate to 430-530 HV0.3 of the surface layer. Meanwhile, the hardness decreases somewhat with the increase of amount of the Ni-coated MoS₂. Besides, the frictional coefficient of the clad layers with adding 5% and 10% MoS₂ is larger, and it decreases somewhat when the addition is 15%. The wear rate of the clad layers also decreases from 7.49×10^-7 mm³·N^-1·m^-1 at 5% addition to 3.29×10^-7 mm³·N^-1·m^-1 at 15% addition.

Key words: laser cladding, self-lubricating coating, microstructure, wear resistance, wear rate

CLC Number:

TG146

He Binfeng. Microstructure and properties of laser clad Ni-based self-lubricating coating on Ti6Al4V alloy[J]. Heat Treatment of Metals, 2021, 46(6): 195-199.

References

[1]郭华锋, 孙涛, 李菊丽, 等. 激光表面改性提高钛合金耐磨性能的研究进展[J]. 热加工工艺, 2012, 41(18): 124-129.
Guo Huafeng, Sun Tao, Li Juli, et al. Research progress of improving wear resistance performance of ti alloy by laser surface modification technology[J]. Hot Working Technology, 2012, 41(18): 124-129.
[2]Li Chonggui, Zhang Qunsen, Wang Feifei, et al. Microstructure and wear behaviors of WC-Ni coatings fabricated by laser cladding under high frequency micro-vibration[J]. Applied Surface Science, 2019, 485: 513-519.
[3]Meng Q W, Geng L, Zhang B Y, et al. Laser cladding of Ni-base composite coatings onto Ti-6Al-4V substrates with pre-placed B4C+NiCrBSi powders[J]. Surface and Coatings Technology, 2006, 200(16/17): 4923-4928.
[4]Das Mitun, Bhattacharya Kaushik, Dittrick Stanley A, et al. In situ synthesized TiB-TiN reinforced Ti6Al4V alloy composite coatings: Microstructure, tribological and in-vitro biocompatibility[J]. Journal of the Mechanical Behavior of Biomedical Materials, 2014, 29: 259-271.
[5]Li Xiaoquan, Du Zeyu, Yang Xuguang. Hot spray technology of TA7 titanium alloy coated by molybdenum and its bonding strength[J]. China Welding, 2006, 15(3): 20-23.
[6]洪子康, 骆祎岚, 朱巧莲, 等. 热处理温度对窄深槽类零件环保铬镀层组织与性能的影响[J]. 金属热处理, 2021, 46(2): 144-148.
Hong Zikang, Luo Yilan, Zhu Qiaolian, et al. Effect of heat treatment temperature on microstructure and properties of environmentally friendly chromium layer of narrow and deep groove parts[J]. Heat Treatment of Metals, 2021, 46(2): 144-148.
[7]Li Hong, Song Zhihui, Tang Peng. Preparation and property of modified micro-arc oxidation coating using Al₂O₃ particles on Ti6Al4V[J]. Rare Metal Materials and Engineering, 2020, 49(3): 755-760.
[8]Weng Fei, Chen Chuanzhong, Yu Huijun. Research status of laser cladding on titanium and its alloys: A review[J]. Materials and Design, 2014, 58: 412-425.
[9]He X, Song R G, Kong D J. Effects of TiC on the microstructure and properties of TiC/TiAl composite coating prepared by laser cladding[J]. Optics and Laser Technology, 2019, 112: 339-348.
[10]Qu C C, Li J, Juan Y F, et al. Effects of the content of MoS₂ on microstructural evolution and wear behaviors of the laser-clad coatings[J]. Surface and Coatings Technology, 2019, 357: 811-821.
[11]Torres H, Vuchkov T, Slawik S, et al. Self-lubricating laser claddings for reducing friction and wear from room temperature to 600 ℃[J]. Wear, 2018, 408/409: 22-33.
[12]Torres H, Vuchkov T, Ripoll M Rodriguez, et al. Tribological behaviour of MoS₂-based self-lubricating laser cladding for use in high temperature applications[J]. Tribology International, 2018, 126: 153-165.
[13]Torres H, Slawik S, Gachot C, et al. Microstructural design of self-lubricating laser claddings for use in high temperature sliding applications[J]. Surface and Coatings Technology, 2018, 337: 24-34.
[14]Liu Xiubo, Zheng Chen, Liu Yuanfu, et al. A comparative study of laser cladding high temperature wear-resistant composite coating with the addition of self-lubricating WS₂ and WS₂/(Ni-P) encapsulation[J]. Journal of Materials Processing Technology, 2013, 213(1): 51-58.
[15]欧阳春生, 刘秀波, 罗迎社, 等. 304不锈钢表面激光制备Ti₃SiC₂-Ni 基自润滑复合涂层的高温摩擦学性能[J]. 表面技术, 2020, 49(8): 161-171.
Ouyang Chunsheng, Liu Xiubo, Luo Yingshe, et al. High-temperature tribological properties of Ti₃SiC₂-Ni based self-lubricating composite coatings prepared on 304 stainless steel by laser cladding[J]. Surface Technology, 2020, 49(8): 161-171.
[16]Liu Xiubo, Liu Haiqing, Meng Xiangjun, et al. Effects of aging treatment on microstructure and tribological properties of nickel-based high-temperature self-lubrication wear resistant composite coatings by laser cladding[J]. Materials Chemistry and Physics, 2014, 143(2): 616-621.