Influence of Thermal Simulated and Real Tandem Submerged Arc Welding Process on the Microstructure and Mechanical Properties of the Coarse-Grained Heat-Affected Zone

被引：8
作者：
Far, Sadegh Moeini [1 ]
机构：
[1] Islamic Azad Univ, Shoushtar Branch, Sch Engn, Shoushtar, Iran
来源：
MATERIALS AND MANUFACTURING PROCESSES | 2011年 / 26卷 / 11期
关键词：
Fracture; Martensite; Microhardness; Microstructure; Pipeline; Steel; Toughness; Welding; LOW-CARBON; CLEAVAGE INITIATION; TOUGHNESS; STEELS;
D O I：
10.1080/10426914.2010.544827
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The X80 high-strength low-alloy microalloyed steel was procured as a hot rolled plate with accelerated cooling. The thermal simulated process involved heating the X80 steel specimens to the peak temperature of 1400 degrees C, with different cooling rates. The four-wire tandem submerged arc welding process, with different heat input, was used to generate a welded microstructure. The martensite/austenite constituent appeared in the microstructure of the heat-affected zone region for all the specimens along the prior-austenite grain boundaries and between bainitic ferrite laths. The blocky-like and stringer martensite/austenite morphology were observed in the heat-affected zone region. The Charpy absorbed energy of specimens was assessed using Charpy impact testing at -50 degrees C. Brittle particles, such as martensite/austenite constituent along the grain boundaries, can make an easy path for crack propagation. Similar crack initiation sites and growth mechanism were investigated for specimens welded with different heat input values.
引用
收藏
页码：1423 / 1429
页数：7
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