INFLUENCE OF Cu ON MICROSTRUCTURES AND WEAR RESISTANCE OF STELLITE 12 MATRIX LASER ALLOYING COATINGS ON TA15-2 TITANIUM ALLOY
Received date: 2013-07-29
Revised date: 2013-12-18
Online published: 2014-05-20
Supported by
Supported by National Natural Science Foundation of China (No.51175035) and China Postdoctoral Science Fuondation Funded Project (No.2012M520135)
Coaxial powder feeding laser alloying of the Stellite 12-B4C mixed powders on an aviation material TA15-2 titanium alloy substrate can form a wear resistance composite coating. Investigation indicated that the Cu addition promoted a great quantity of the ultrafine nanoscale polycrystals and amorphous phases to be produced in such coating, leading to an improvement of wear resistance. The nanocrystallization process of Cu on laser clad coatings, i.e. and the process of the productions of the nanoscale polycrystals, and also the AlCu2Ti ultrafine nanocrystals which were produced through in situ chemical reaction in laser molten pool retarded greatly growth of the particles. The coating with Cu mainly consisted of γ-Co, M12C, M23C6, W-C, Ti-B, AlCu2Ti and also the amorphous phases. AlCu2Ti ultrafine nanocrystals owned the high diffusibility in such high temperature molten pool, causing the lattice distortions, which also played an important amorphization effect on such coating.
Key words： laser alloying; surface reinforcement; wear property; amorphous; nanocrystal
Jianing LI , Shuili GONG , Juan WANG , Feihu SHAN , Huaixue LI , Bing WU . INFLUENCE OF Cu ON MICROSTRUCTURES AND WEAR RESISTANCE OF STELLITE 12 MATRIX LASER ALLOYING COATINGS ON TA15-2 TITANIUM ALLOY[J]. Acta Metall Sin, 2014 , 50(5) : 547 -554 . DOI: 10.3724/SP.J.1037.2013.00458
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