Increase of bending fatigue resistance for tungsten inert gas welded SS400 steel plates using friction stir processing

被引：16
作者：
Ito, Kazuhiro [1 ]
Okuda, Tatsuya [1 ]
Ueji, Rintaro [1 ]
Fujii, Hidetoshi [1 ]
Shiga, Chiaki [1 ]
机构：
[1] Osaka Univ, Joining & Welding Res Inst, Ibaraki, Osaka 5670047, Japan
来源：
MATERIALS & DESIGN | 2014年 / 61卷
基金：
日本科学技术振兴机构;
关键词：
Structural steel; Tungsten inert gas; Friction stir processing; Bending fatigue; ULTRASONIC PEENING TREATMENT; JOINTS; STRENGTH; ENHANCEMENT; IMPROVEMENT; BEHAVIOR; LIFE;
D O I：
10.1016/j.matdes.2014.04.076
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
To improve the fatigue resistance of tungsten inert gas (TIG)-welded SS400 steel plates, friction stir processing (FSP) was performed on TIG weld beads. Although the tensile properties of the TIG-welded steel plates with FSP were similar to those without FSP, their bending strength exhibited about 1.4 GPa at room temperature, which was 40% higher than that without FSP (about 1 GPa). Similarly, FSP produced about 170% increase in the number of cycles to failure at an applied stress amplitude of 270 MPa during three-point bending fatigue at room temperature. A fine-grained FSP region (grain sizes of about 1-2 mu m in diameter) enhanced grain-boundary strengthening, leading to the higher bending strength and bending fatigue resistance. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：275 / 280
页数：6
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