中锰TRIP钢电阻点焊研究进展与展望

doi:10.11896/cldb.20080023

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Abstract In response to increasingly severe environmental problems, the automotive industry should cut down the weight of vehicles to achieve energy-saving and emission-reduction goals. The application of traditional light-weight high-strength steels, such as dual-phase steel (DP), transformation-induced plasticity steel (TRIP), austenitic steel, etc., is limited by due to production costs, low plastic product and metallurgical issues. The strong plastic product of medium manganese TRIP steel can reach 30GPa%—60GPa%, which achieves a good combination of excellent comprehensive mechanical properties and lightweight characteristics, and has extremely high application prospects in lightening the body. Based on the evolution of microstructure and deformation mechanism of medium-Mn TRIP steel, the main factors on the quality of the resistance spot welding joint were discussed, and the effects of chemical composition, microstructure, nugget geometry and welding process of the base metal were summarized. By analyzing the characteristics of martensite transformation, grain size, and morphology of austenite during the welding process, the internal factors on the toughness of the heat-affected zone of the welded joint of the medium-Mn TRIP steel were revealed. This review summarized the research on advances of high strength steel (AHSS) in recent years, expounded the three typical failure modes of AHSS solder joints, the internal failure mechanism and its influencing factors, and focused on the fracture behavior of solder joints in tensile and shear tests. A method for predicting the critical nugget size to ensure pull-out failure (PF) was proposed. Finally, the latest research on post-welding modification was summarized, and future research hotspots and directions of resistance spot welding of medium-Mn TRIP steel were prospected.

Key words： medium-Mn TRIP steel resistance spot welding microstructure failure mode

Published: Online: 2022-05-24

CLC number:

TG40

Fund:National Natural Science Foundation of China (51861024).

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	LIU Teng
	ZHU Zhengqiang
	WU Linfeng

Cite this article:

LIU Teng,ZHU Zhengqiang,WU Linfeng. Research Progress and Prospect of Resistance Spot Welding of Medium-Mn TRIP Steel[J]. Materials Reports, 2022, 36(10): 20080023-7.

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http://www.mater-rep.com/EN/10.11896/cldb.20080023 OR http://www.mater-rep.com/EN/Y2022/V36/I10/20080023

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