Microstructure and properties of fiber laser welded joints of TRIP590 steel used for automobile

被引：0
|
作者：
Tuo W. [1 ]
Yang S. [1 ,2 ]
Yang W. [1 ]
Zhang D. [1 ]
机构：
[1] School of Materials Engineering, Shanghai University of Engineering Science, Shanghai
[2] Shanghai Research & Development Center for Key Technologies of Ultra-Intense Laser Processing, Shanghai
来源：
Yang, Shanglei (yslei@126.com) | 1600年 / Cailiao Daobaoshe/ Materials Review卷 / 30期
关键词：
Fiber laser; Microstructure; Product of strength and elongation; Retained austenite; TRIP590;
D O I：
10.11896/j.issn.1005-023X.2016.04.025
中图分类号：
学科分类号：
摘要：
To accelerate the development of the laser welding technology of advanced high strength steel, TRIP590 steel with a thick of 1.5 mm was welded by using a fiber laser. The microstructure, hardness and tensile properties of the welded joints were studied. The influence of welding speed on the microstructure and properties were analyzed. The results showed that the microstructure of the welding zone mainly contained lathy martensite. Heat affected zone (HAZ) could be divided into two parts: incomplete quenched zone and quenched zone. The hardness distribution of weld joints was nonuniform, and the HAZ or welding zone had the highest hardness. With the increase of welding speed, martensite content increased and bainite content reduced in the HAZ, the microstructure of HAZ and welding zone became finer. The samples for tensile test which were welded at the speed from 3 to 5 m/min all fractured in base metal. The elongation was more than 30%, and the elongation rose with the increase of the welding speed. The product of strength and elongation (PSE) was more than 20000 MPa%. The induced effect of phase transformation was notable, resulting in the transformation of most of the residual austenite into martensite. The plasticity and strength of TRIP590 increased at the same time, which achieved a unity of high strength and high plasticity. © 2016, Materials Review Magazine. All right reserved.
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页码：102 / 105
页数：3
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