LASER IN SITU SYNTHESIZED TiN/Ti3Al COMPOSITE COATINGS

doi:10.3724/SP.J.1037.2010.00641

Acta Metall Sin

2011, Vol. 47

Issue (8): 1086-1093 DOI: 10.3724/SP.J.1037.2010.00641

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LASER IN SITU SYNTHESIZED TiN/Ti₃Al COMPOSITE COATINGS

ZHANG Xiaowei, LIU Hongxi, JIANG Yehua, WANG Chuanqi

Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093

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ZHANG Xiaowei LIU Hongxi JIANG Yehua WANG Chuanqi. LASER IN SITU SYNTHESIZED TiN/Ti₃Al COMPOSITE COATINGS. Acta Metall Sin, 2011, 47(8): 1086-1093.

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Abstract Utilizing the high–temperature chemical reaction between Ti and AlN, TiN reinforced Ti₃Al composite coating was in situ synthesized on TC4 alloy substrate by laser cladding technique. The phase constitution and microstructure of treated samples were examined by XRD and SEM. The results reveal that the coating is mainly composed of TiN and Ti3Al phase. When the molar ratio between Ti and AlN is 4∶2, the content of TiN reduces as the laser power density increases; whereas when the molar ratio between Ti and AlN is 4∶1, the content of TiN increases with increasing the laser power density. SEM observation shows that the morphology of TiN changes gradually from bar–shaped to granular with the increase of laser power density. When the molar ratio between Ti and AlN is 4∶1 and the laser power density is 15.28 kW·s·cm−2, the macro-morphology of surface coating is better, no pores and cracks appear. The average microhardness of laser cladding coating is 3.4 times larger than that of TC4 alloy substrate.

Key words: laser cladding TiN/Ti₃Al composite coating microstructure in situ synthesis

Received: 01 December 2010

ZTFLH:

TG146. 2+3

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Supported by National Natural Science Foundation of China(No.51165015)

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2010.00641 OR https://www.ams.org.cn/EN/Y2011/V47/I8/1086

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