Effect of crystallographic features on low-temperature fatigue ductile-to-brittle transition for simulated coarse-grained heat-affected zone of bainite steel weld

被引：14
|
作者：
Wang, Boshi [1 ]
Chen, Nannan [1 ]
Cai, Yan [1 ]
Guo, Wei [1 ]
Wang, Min [1 ]
机构：
[1] Shanghai Jiao Tong Univ, Shanghai Key Lab Mat Laser Proc & Modificat, Shanghai 200240, Peoples R China
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2023年 / 170卷
关键词：
CGHAZ; Bainite microstructure; Crystallographic characteristic; Fatigue crack growth; Low -temperature fatigue ductile -to -brittle; transition; CRACK-GROWTH-RATES; LOW-CARBON STEEL; IMPACT TOUGHNESS; MECHANICAL-PROPERTIES; BRIDGE STEEL; TRANSFORMATION; AUSTENITE; MICROSTRUCTURES; PROPAGATION; MARTENSITE;
D O I：
10.1016/j.ijfatigue.2023.107523
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
The coarse-grained heat-affected zone (CGHAZ) of bainite steel welds is prone to lose toughness due to welding thermal history. This study aims to reveal the correlation between crystallographic characteristics and fatigue ductile-to-brittle transition (FDBT) for typical microstructures (lath bainite and granular bainite) in the CGHAZ at low temperatures. Compared to the granular bainite, the lath bainite presents retarded growth of fatigue cracking and significantly lowered FDBT temperature (-20 degrees C vs-40 degrees C). The superior low-temperature fatigue performances of lath bainite are ascribed to the high-fraction high-angle grain boundary formed by its unique variant selection.
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页数：16
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