Effect of contamination on microstructure in friction stir spot welded DP590 steel

被引：56

作者：

Ohashi, R. ^{[1
]}

Fujimoto, M. ^{[1
]}

Mironov, S. ^{[2
]}

Sato, Y. S. ^{[2
]}

Kokawa, H. ^{[2
]}

机构：

[1] Kawasaki Heavy Ind Co Ltd, Mfg Technol Dept, Syst Technol Dev Ctr, Chuo Ku, Kobe, Hyogo 6508670, Japan

[2] Tohoku Univ, Dept Mat Proc, Grad Sch Engn, Aoba Ku, Sendai, Miyagi 9808579, Japan

来源：

SCIENCE AND TECHNOLOGY OF WELDING AND JOINING | 2009年 / 14卷 / 03期

关键词：

Friction stir spot welding; Microstructure; Hardness; Joint strength; DP590; steel;

D O I：

10.1179/136217108X388642

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this study, FSSW of DP590 steel was performed using both bare and TiC/TiN coated Si(3)N(4) tool with Ar shielding, and effect of contamination on the microstructure during FSSW was examined. Defect free welds were successfully obtained at all welding conditions. Si, N and O contaminations were clearly found in the weld when bare Si(3)N(4) tool was used without Ar shielding, but the coated tool and Ar shielding could suppress the contaminations. The contaminations caused higher hardness in the vicinity of the pin hole and reduced the weld strength. The present study showed that the prevention of the contaminations could improve the weld strength, especially the cross-tension strength, in FSSW of DP590 steel using Si(3)N(4) tool.

引用

页码：221 / 227

页数：7

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