Effect of the Cooling Time on the Cross Tensile Strength of the Resistance Spot Welded Medium Manganese Steel

被引：6
作者：
Wang, Yuanfang [1 ]
Ding, Kai [1 ]
Zhao, Bingge [1 ]
Zhang, Yuanheng [1 ]
Wu, Guanzhi [1 ]
Wei, Tao [1 ]
Pan, Hua [2 ,3 ]
Gao, Yulai [1 ]
机构：
[1] Shanghai Univ, Ctr Adv Solidificat Technol CAST, Sch Mat Sci & Engn, Shanghai 200444, Peoples R China
[2] State Key Lab Dev & Applicat Technol Automot Stee, Shanghai 201900, Peoples R China
[3] Baoshan Iron & Steel CO LTD, Automobile Steel Res Inst, R&D Ctr, Shanghai 201900, Peoples R China
来源：
TMS 2020 149TH ANNUAL MEETING & EXHIBITION SUPPLEMENTAL PROCEEDINGS | 2020年
基金：
中国国家自然科学基金;
关键词：
Medium manganese steel; Resistance spot welding; Cross tensile strength; Cooling time; Tempered martensite; FAILURE MODE TRANSITION; MECHANICAL-PROPERTIES; MICROSTRUCTURE; AUSTENITE; DP600; TRANSFORMATION; SEGREGATION; TOUGHNESS; SIZE;
D O I：
10.1007/978-3-030-36296-6_48
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effect of the cooling time between the welding pulses and post-heating pulses on the cross tensile strength (CTS) of the resistance spot welded medium manganese steel (RSW-MMS) was studied in this paper. Optical microscope (OM) and scanning electron microscope (SEM) were employed to analyze the microstructure evolution. The results showed that the microstructure in nugget with cooling time of 100 ms was martensite and the microhardness could reach similar to 530 HV. On the contrary, the microstructure of the sample cooled for 2000 ms was tempered martensite with the microhardness of similar to 370 HV. Accordingly, the strength increased from 1.8 to 3.4 kN accompanied with the failure mode transformed from interfacial fracture (IF) to partial interfacial fracture (PIF). The improvement of the CTS for the resistance spot welded 7 Mn MMS was mainly attributed to the higher ability of the tempered martensite to prevent the crack propagation.
引用
收藏
页码：515 / 523
页数：9
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