Effect of Heat Treatment on Microstructure and Fretting Wear Resistance of Laser Clad Ti-matrix Composite Coatings
LIU Xiu-bo1,2, ZHOU Zhong-yan1, ZHAI Yong-jie2, QIAO Shi-jie2, XU Jiang-ning2, LUO Ying-she1, TU Rong3
1. Hunan Province Key Laboratory of Engineering Rheology, Central South University of Forestry and Technology, Changsha 410004, China;
2. School of Mechanical and Electric Engineering, Soochow University, Suzhou 215006, Jiangsu, China;
3. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
Abstract：To study the effect of heat treatment at different temperatures on microstructure and fretting wear resistance of laser clad Ti-matrix composite coatings, Ti-matrix composite coatings were fabricated by laser cladding with the powder precursor:40%Ti-25.2%TiC-34.8%WS2 (mass fraction). The coatings were heated at 300,500℃ and 700℃ in vacuum for 1h respectively, and the microstructure and fretting wear resistance of coatings were analyzed. Results indicate that the main phase compositions of coatings are all composed of α-Ti, (Ti, W)C1-x, TiC, Ti2SC and TiS. The microhardness of coatings without heat treatment and with heat treatment at 300,500℃ and 700℃ is 1049.8,980.7,1143.3HV0.5 and 1190.7HV0.5. The coating with heat treatment at 700℃ exhibits excellent fretting wear resistance and the wear mechanism is mainly adhesive wear and abrasive wear.
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