Effect of Al/Si ratio on microstructure and wear resistance of Ti-Al-Si coating onTC4 alloy by laser cladding

doi:10.13251/j.issn.0254-6051.2021.03.028

Abstract

Abstract: Ti-Al-Si coating was prepared on the surface of TC4 alloy by laser cladding and using Ti-Al-Si composite powder with different Al/Si ratio as raw material. Effect of Al/Si ratio on phase composition, microstructure, microhardness and friction and wear properties of the coating was investigated. The results show that there is a good metallurgical bonding between the coating and the substrate, and no obvious cracks and pores are found in the single pass coating. The main structures of the coatings with different Al/Si ratio are mainly the dendrite, which has the main component of α-Ti, the reinforcing phase is lamellar Ti₅Si₃ and Ti₇Al₅Si₁₂, and TiAl, Ti₃Al and TiAl₃ phases are distributed among the dendrite. The higher the content of Si element, the more the content of in-situ reinforcing phase is in the coating. The highest microhardness of the coating is 1194 HV0.1, which is about 4.1 times of that of the substrate. However, the brittleness of the coating increases and the wear resistance decreases with the increase of the content of Si element. It is also found that the effect of reinforcing phases on hardness and wear resistance is stronger than that of grain refinement when the coating has more Al element.

Key words: laser cladding, Ti-Al-Si coating, Al/Si ratio, microstructure, microhardness, wear resistance

CLC Number:

TG135⁺.6

Liu Ran, Gao Yuan, Wu Tao. Effect of Al/Si ratio on microstructure and wear resistance of Ti-Al-Si coating onTC4 alloy by laser cladding[J]. Heat Treatment of Metals, 2021, 46(3): 135-139.

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