热处理对30CrMnSiNi2A钢电子束焊接头组织和性能的影响

doi:10.11896/cldb.24040172

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Abstract The effect of a new post-weld heat treatment system on the microstructure and properties of electron beam welded joints of 30CrMnSiNi2A steel was investigated by experiment. The results show that after adopting this new heat treatment system, the lath martensite and tempered sorbite in the weld, fusion line, heat affected zone and base metal transform into tempered martensite. The content of retained austenite in the weld, fusion line and heat affected zone increases greatly, and the content of retained austenite in the base metal decreases slightly. The grain size of the weld, fusion line, heat affected zone and base metal tends to be consistent, homogenizing the microstructure of these mentioned regions. In terms of mechanical properties, the hardness of the weld joint after welding is much higher than that of the base metal, and from weld joint center towards base metal, the hardness gradually decreases. After heat treatment, the hardness difference between the weld joint, fusion line, heat affected zone and the base metal is greatly eliminated, and the hardness is homogenized. The tensile strength of the base metal and welded joint is 795 MPa and 765 MPa, respectively, and the tensile strength of the joint after heat treatment is obviously improved to 1 456 MPa. This new heat treatment system adopted here promotes the uniformity of the microstructure of each region of the joint, effectively decreasing the performance difference between the regions.

Key words： 30CrMnSiNi2A steel electron beam welding microstructure mechanical property heat treatment

Published: 25 July 2025 Online: 2025-07-29

CLC number:

TG456.3

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	Articles by authors
	FENG Dianyuan
	LIU Shichao
	WANG Shanlin
	LI Huanhuan
	HONG Min
	TU Wenbin

Cite this article:

FENG Dianyuan,LIU Shichao,WANG Shanlin, et al. Effect of Heat Treatment on Microstructure and Mechanical Properties of Electron Beam Welding Joint of 30CrMnSiNi2A Steel[J]. Materials Reports, 2025, 39(14): 24040172-7.

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https://www.mater-rep.com/EN/10.11896/cldb.24040172 OR https://www.mater-rep.com/EN/Y2025/V39/I14/24040172

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