GH4065A合金电子束焊接工艺及接头组织性能

doi:10.11896/cldb.19080030

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Abstract In this paper, the weld quality of GH4065A alloy under different electron beam welding (EBW) conditions was studied. The causes of welding cracks and the mechanism of crack suppression by double-spot EBW were discussed. The microstructure and mechanical properties of the welded joint were tested and analyzed. It was found that the double-spot EBW can effectively connect GH4065A alloy, and the weld quality can meet the requirements of grade I in HB7608-1998. However, the conventional EBW was easy to crack. The results showed that the weld zone (WZ) of the EBW joint was dominated by dendrites, and there was segregation of Nb and Ti elements. The γ′ strengthening phase gradually coarsened from the weld to the matrix. The difference of microstructure between the WZ and the matrix was the main reason for the reduction of tensile plasticity at high temperature. The simulation results showed that the double-spot EBW can reduce the energy concentration in the welding process, improve the cooling speed of the weld, and reduce the tendency of cracking. After aging treatment, the strength coefficient of welded joint at 25—750 ℃ was over 96%, and the elongation of welded joint at 750 ℃ was 9%, indicating that EBW was an effective joining method of GH4065A alloy structure.

Key words： GH4065A alloy electron beam welding weld mechanical properties

Published: 02 December 2020

CLC number:

TG456.3

Fund:This work was financially supported by the Special Foundation for State Major Basic Research Program of China (61429080102).

About author:: Tong Zhaoreceived his M.S. degree in June 2014 from Beijing University of Chemical Technology. Since August 2014, he has worked in Science and Technology on Power Beam Processes Laboratory, AVIC Manufacturing Technology Institute, mainly engaged in the research of electron beam processing technology.

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	ZHAO Tong
	TANG Zhenyun
	LIU Qiaomu
	HUANG Shuo
	ZHANG Wenyun
	ZHANG Beijiang

Cite this article:

ZHAO Tong,TANG Zhenyun,LIU Qiaomu, et al. Electron Beam Welding Process and Microstructure and Properties of Joint of GH4065A Alloy[J]. Materials Reports, 2020, 34(22): 22105-22110.

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http://www.mater-rep.com/EN/10.11896/cldb.19080030 OR http://www.mater-rep.com/EN/Y2020/V34/I22/22105

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