Effects of post-weld heat treatment on mechanical properties and microstructure of resistance spot-welded lightweight steel

被引：10

作者：

Hwang, Insung ^{[1
]}

Cho, Heewon ^{[1
,2
]}

Nam, Sangwoo ^{[1
,3
]}

Kang, Munjin ^{[1
]}

Koo, Min-Seo ^{[4
]}

Kim, Young-Min ^{[1
]}

机构：

[1] Korea Inst Ind Technol, Joining R&D Grp, Incheon 21999, South Korea

[2] Hanyang Univ, Sch Mech Design Engn, Seoul 04763, South Korea

[3] Seoul Natl Univ, Dept Mat Sci & Engn, Seoul 08826, South Korea

[4] POSCO, Tech Res Labs Gwangyang Res Lab, Sheet Prod & Proc Res Grp, Gwangyang 57807, South Korea

来源：

INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY | 2019年 / 104卷 / 9-12期

关键词：

Resistance spot welding; Lightweight steel; Post-weld heat treatment; Tempered martensite; Second welding current; Furnace; DUAL-PHASE; BEHAVIOR; SPHEROIDIZATION; ACCELERATION; TEMPERATURE; WELDABILITY; CARBON;

D O I：

10.1007/s00170-019-04366-x

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

To improve the mechanical properties of resistance spot-welded 780-MPa-grade lightweight steel, post-weld heat treatment (PWHT) through the application of a second welding current and using a furnace was performed after resistance spot welding. It was not possible to obtain satisfactory mechanical properties of the weld through the application of a second welding current. In the case of the PWHT by a furnace, the required loads were satisfied when PWHT was applied at temperatures of less than 300 degrees C for more than 30 min, and at more than 300 degrees C for 15 min or more. Due to the softening of martensite by PWHT, the resistance to fracture progression during tensile test was increased, and mechanical properties could be improved.

引用

页码：4813 / 4825

页数：13

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