非真空激光定向凝固参数对DZ22合金熔覆层组织的影响

doi:10.11896/cldb.19050019

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Abstract In order to improve the microstructure of laser directional solidification cladding for DZ22, realize large area repairing for directional solidification base materials, fixed variable method was adopted in this work, with which the influence of laser process parameters on the microstructure of directionally solidification alloy DZ22 was studied by changing the laser process parameters. The results showed that the primary dendrites spa-cing and the height of the steering dendrites zone became larger, the number of the secondary dendrites and the volume was bigger, and the zone of isoaxial crystal was increased with the increase of current and pulse width; The zone of isoaxial crystal in the laser cladding upper layer was enlarged first and then reduced, and the primary dendrites were tapering with the increase of frequency; Scanning velocity was negatively correlated with the primary dendrites scale, and the primary dendrites spacing and the height of the steering dendrites zone became smaller with the increase of scanning velocity, besides, high scanning speed was not conducive to the formation of columnar structure.

Key words： DZ22 alloy directional solidification laser cladding microstructure

Published: 06 November 2020

CLC number:

TG146.1

Fund:Natural Science Foundation of China (51505491).

About author:: Haodong Liureceived his B.E. degree in oil-gas sto-rage and transportation engineering from China University of Petroleum in Sep. 2005—Jun. 2009 and M.E. degree in material science from Army Engineering University in Sep. 2009—Dec. 2011 and Ph.D. degree in aeronautical and astronautical science and technology from Naval Aviation University in Feb. 2012—Jun. 2016. He was appointed to the faculty upon graduation, and is currently a lecturer of the NAU. He has published more than 20 journal papers as the first author, applied 3 national invention patents and 1 of them were authorized. In addition, he is a reviewer of several academic journals. His research interests focus on the advanced metals with national and army research priority, and the fundamental theory & application about the advanced processing and microstructure & property control.

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	LIU Haodong
	YU Hui
	DAI Jingtao
	CUI Aiyong
	WEI Huakai
	ZHAO Peizhong
	LU Changliang

Cite this article:

LIU Haodong,YU Hui,DAI Jingtao, et al. Effect of Non-vacuum Laser Directional Solidification Parameters on Cladding Layer of DZ22 Alloy[J]. Materials Reports, 2020, 34(20): 20091-20095.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.19050019 OR http://www.mater-rep.com/EN/Y2020/V34/I20/20091

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