Effect of laser peening on improving fatigue strength of welded rib of high-strength steel

被引：0

作者：

Sakino Y. ^{[1
]}

Yoshikawa K. ^{[2
]}

Sano Y. ^{[3
]}

Sumiya R. ^{[3
]}

机构：

[1] Kinki University, Faculty of Engineering

[2] Graduate School of Engineering, Osaka University

来源：

Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society | 2016年 / 34卷 / 01期

关键词：

Box welded joint; Fatigue strength; High-strength steel; Laser peening; Residual stress;

D O I：

10.2207/qjjws.34.20

中图分类号：

学科分类号：

摘要：

Laser peening can introduce compressive residual stress to the surface and, therefore, is effective in enhancing the fatigue strength. This study targets 780 MPa grade high-strength steel (HT780) in order to clarify whether laser peening generates compressive residual stress on the surface of HT780, and whether such stress would account for prolonged fatigue life in the welded zones of HT780. As a result, large and deep compressive residual stress was generated on the base metal surface and at the boxing toe of HT780 under the peening conditions employed for 490 MPa grade steel. The smaller the applied stress range, the greater was the improvement of the fatigue life of the high-strength steel boxing toe by laser peening.

引用

页码：20 / 25

页数：5

共 12 条

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