热处理工艺对M390/304闪光对焊焊接接头微观组织及力学性能的影响

doi:10.11896/cldb.22050290

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Abstract In order to improve the mechanical properties of M390 high carbon martensitic stainless steel and 304 austenitic stainless steel welded joints, especially the hardness of welded joints to meet the requirements of advanced knives production, different heat treatment processes of welded joints were performed for M390 high carbon martensitic stainless steel and 304 austenitic stainless steel joints obtained by flash butt welding. Tensile, Vickers microhardness tests and scanning electron microscopy (SEM) were used to characterize the mechanical properties and microstructure evolution of welded joints with different heat treatment processes, line scanning was used to investigate element diffusion in various heat treatment processes and the fracture mechanism of welder joints under different heat treatment processes was investigated. The research results show that the 1 150 ℃ air cooling heat treatment process can be used as the best heat treatment process for M390/304 welded joints, the tensile strength and elongation of the corresponding welded joints reach 494 MPa and 15.7%, which increase by 2.7% and 182% compared to as-welded, respectively. The greater degree of element diffusion in welded joint under 1 150 ℃ air cooling process, as well as the improved uniformity of chemical composition in weld metal, account for the significant increase in elongation. The fracture types are all brittle fractures under different heat treatment processes, but the fracture locations are not the same. The change in fracture location is caused by different diffusion degrees of C, Cr, Ni elements during different heat treatment processes, as well as differences in the size and morphology of carbides in weld metal, which result in different strengthening effects of the second phase in weld metal.

Key words： M390/304 welded joint flash butt welding quenching process microstructure mechanical property

Published: Online: 2023-12-19

CLC number:

TG156

Fund:National Natural Science Foundation of China (52175325,51961024,52071170).

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	Articles by authors
	DONG Hao
	QIAO Lixue
	CAO Rui
	WANG Caiqin
	CHE Hongyan
	WANG Tiejun
	YAN Yingjie

Cite this article:

DONG Hao,QIAO Lixue,CAO Rui, et al. Effect of Heat Treatment Process on Microstructure and Mechanical Properties of M390/304 Flash Butt Welding Welded Joints[J]. Materials Reports, 2023, 37(24): 22050290-6.

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http://www.mater-rep.com/EN/10.11896/cldb.22050290 OR http://www.mater-rep.com/EN/Y2023/V37/I24/22050290

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