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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