Microstructure and fatigue properties of friction stir welded high-strength steel plates

被引：20
|
作者：
Sorger, Goncalo [1 ]
Lehtimaki, Eero [1 ]
Hurme, Susanna [1 ]
Remes, Heikki [1 ]
Vilaca, Pedro [1 ]
Molter, Lars [2 ]
机构：
[1] Aalto Univ, Sch Engn, Dept Mech Engn, Espoo, Finland
[2] Ctr Maritime Technol eV, Hamburg, Germany
来源：
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING | 2018年 / 23卷 / 05期
关键词：
Friction stir welding; high-strength steel; microstructure; fatigue; S690; S355; MECHANICAL-PROPERTIES; DH36; STEEL; MILD-STEEL; RESISTANCE; JOINTS; HEAT;
D O I：
10.1080/13621718.2017.1399574
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The weldability of high-strength steels (HSSs) is limited by their loss of strength, toughness and fatigue properties. In demanding applications, the fatigue properties of welds are among the strictest requirements. This paper presents a weldability analysis focusing on the microstructure and fatigue properties of 6mm thick S690 and S355 HSS plates joined by friction stir welding. Their fatigue properties are compared to design recommendations and to fatigue properties obtained with other welding techniques. Results show that the high-quality friction stir welded steel joints outperform high-quality arc welds and FAT80 design recommendations. The fatigue strength of the friction stir welded joints is increased with material yield strength. The mechanisms governing crack initiation at different maximum stress levels are discussed.
引用
收藏
页码：380 / 386
页数：7
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