Ti811表面单道与多道TC4激光熔覆层微观组织对比

doi:10.11896/j.issn.1005-023X.2018.12.008

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Abstract According to the proposed repair scheme of CFM engine maintenance manual, single-pass and multitrack TC4 laser cladding layers were prepared on the surface of Ti811 titanium alloys with coaxial powder feeding. Phase compositions and microstructures of coatings were analyzed by scanning electron microscope (SEM), X-ray diffraction (XRD) and energy dispersive spectrometer (EDS). The microhardness profiles of coatings along the depth direction were measured on a microhardness tester. The results show that the microstructure of the single-pass coating shows the widmanstatten structure. Many acicular martensite α′ and residual β′-Ti are distributed in the grain boundary composed of α-Ti and the nanoparticle Ti₃Al is dispersed in the single-pass coating with 10—150 nm. The microstructure of the multitrack coating evenly distributed Ti₃Al in addition to the substrate α-Ti. The microhardness is improved compared with that of the substrate in both single-pass and multitrack coatings. The highest microhardness of single-pass coating is about 485HV_0.5. The highest microhardness of multitrack coating is 510HV_0.5.

Key words： Ti811 laser cladding TC4 multitrack microstructure

Published: 20 July 2018

CLC number:	TG174.44
	TG156.99

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	Articles by authors
	ZHANG Tiangang
	SUN Ronglu
	AN Tongda
	ZHANG Hongwei

Cite this article:

ZHANG Tiangang,SUN Ronglu,AN Tongda, et al. Comparative Study on Microstructure of Single-pass and Multitrack TC4 Laser Cladding Layer on Ti811 Surface[J]. Materials Reports, 2018, 32(12): 1983-1987.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.12.008 OR http://www.mater-rep.com/EN/Y2018/V32/I12/1983

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