| ZHAI Yong-jie,LIU Xiu-bo,QIAO Shi-jie,XU Jiang-ning,GENG Rong-hua,PENG Yong.Influence of Heat Treatment on Microstructure and Mechanical Properties of Laser Cladding Ti2SC/TiS Coating on TA2 Alloy[J],46(6):207-214 |
| Influence of Heat Treatment on Microstructure and Mechanical Properties of Laser Cladding Ti2SC/TiS Coating on TA2 Alloy |
| Received:January 20, 2017 Revised:June 20, 2017 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2017.06.033 |
| KeyWord:laser cladding TA2 alloy heat treatment Ti-based self-lubrication wear resistance and antifriction |
| Author | Institution |
| ZHAI Yong-jie |
School of Mechanical and Electric Engineering, Soochow University, Suzhou , China |
| LIU Xiu-bo |
1.School of Mechanical and Electric Engineering, Soochow University, Suzhou , China;2.State Key Laboratory of Tribology, Tsinghua University, Beijing , China |
| QIAO Shi-jie |
School of Mechanical and Electric Engineering, Soochow University, Suzhou , China |
| XU Jiang-ning |
School of Mechanical and Electric Engineering, Soochow University, Suzhou , China |
| GENG Rong-hua |
School of Mechanical and Electric Engineering, Soochow University, Suzhou , China |
| PENG Yong |
School of Mechanical and Electric Engineering, Soochow University, Suzhou , China |
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| Abstract: |
| The work aims to obtain composite coatings of better tribological properties by performing heat treatment to laser cladding self-lubricating wear-resistant coatings. The composite coatings were fabricated by cladding 40% Ti-25.2% TiC-34.8%WS2 composite powder on TA2 alloy by taking advantage of laser cladding technology.The coatings were kept at 500 ℃ in vacuum for 1 h and 2 h, respectively, and then phases, microstructure, microhardness and tribological property of the coatings subject to heat treatment or not were analyzed with scanning electron microscope (SEM), X-ray diffractometer (XRD), energy dispersive system (EDS), microhardness tester, friction wear testing machine and atomic force microscope (AFM) systematically. Main phases of the coatings subject to heat treatment or not were α-Ti, (Ti,W)C1－x, TiC, Ti2SC and TiS. Microhardness of the coatings subject to 1 h and 2 h heat treatment (1143.3HV0.5 and 1162.7HV0.5) has increased compared with that of coatings not subject to heat treatment (1049.8HV0.5). Coefficient of friction and wear rate of the coatings subject to 1 h and 2 h heat treatment were 0.29 and 6.66×10−5 mm3/(N•m), 0.29 and 5.65×10−5 mm3/(N•m), respectively. Compared with the coating not subject to heat treatment (0.32 and 18.92×10−5 mm3/(N•m)), those coatings subject to heat treatment exhibited better wear resistance and antifriction property. Wear mechanism of the coatings subject to 1 h and 2 h heat treatment was mainly presented as abrasive wear, while that of coatings not subject to heat treatment was mainly plastic deformation and adhesive wear. Compared with the coating not subject to heat treatment, microhardness and tribological properties of the coatings subject to 1 h and 2 h heat treatment have improved, but those of the coatings change slightly in different time of heat treatment. |
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