Structural Characteristics and Mechanical Properties of Laser-fused In-situ Ti-C-B-Al Composite Coatings
SHU Linsen1,2,*, ZHANG Candong1,3, YU Helong4, ZHANG Chaoming1
1 School of Mechanical Engineering, Shaanxi University of Technology, Hanzhong 723001, Shaanxi, China 2 Shaanxi Key Laboratory of Industrial Automation, Hanzhong 723001, Shaanxi, China 3 School of Modern Technology, Mianyang City College, Mianyang 621000, Sichuan, China 4 National Key Laboratory for Remanufacturing, Army Academy of Armored Forces, Beijing 100072, China
Abstract: The Ti-C-B-Al composite coatings containing in-situ autogenous TiC, TiB, and TiAl intermetallic compounds reinforced with titanium base were prepared on the surface of Ti6Al4V substrate using titanium powder, aluminum powder, and boron carbide powder as raw materials, and the microstructure, phase composition, microhardness and nanoindentation properties of the composite coatings were investigated using scanning electron microscopy, X-ray diffractometer, microhardness tester, and nanoindentation tester. The results showed that the three powders reacted adequately with the high-energy laser beam to produce TiC, TiB, and TiAl intermetallic compound reinforced phases. The surface of the compo-site coating is smooth, with no pores or cracks inside the coating, forming an excellent metallurgical bond with the substrate, the reinforcement phase is evenly distributed in the coating, and the cladding coating has better mechanical properties than the matrix. The hardness of the coating ranged from 460HV0.3 to 510HV0.3. At the same time, there is a good relationship between the nano-mechanical properties and microhardness. When the m(Ti)∶m(Al)∶m(B4C)=84∶12∶4, the prepared coating has better mechanical properties.
通讯作者:
*舒林森,陕西理工大学机械工程学院副教授、硕士研究生导师。2007年北华大学机械设计制造及其自动化专业本科毕业,2010年四川轻化工大学机械设计及理论专业硕士毕业,2014年重庆大学机械制造及其自动化专业博士毕业后到陕西理工大学工作至今。目前主要从事激光熔覆、力学强度、机械结构有限元等方面的研究工作。发表论文20余篇,包括《机械工程学报》《中国机械工程》《中国激光》、Chinese Journal of Mechanical Engineering、Coating、Materials Research Express等。shulinsen19@163.com
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2024, Vol. 38 
