Effects of low-temperature transformation and transformation-induced plasticity on weld residual stresses: Numerical study and neutron diffraction measurement

被引：146
作者：
Jiang, Wenchun [1 ]
Chen, Wei [1 ]
Woo, Wanchuck [2 ]
Tu, Shan-Tung [3 ]
Zhang, Xian-Cheng [3 ]
Em, Vyacheslav [4 ]
机构：
[1] China Univ Petr East China, Coll Chem Engn, State Key Lab Heavy Oil Proc, Qingdao 266580, Peoples R China
[2] Korea Atom Energy Res Inst, Neutron Sci Div, Daejeon 305353, South Korea
[3] East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety MOE, Shanghai 200237, Peoples R China
[4] NRC Kurchatov Inst, Neutron Res Dept, 1 Akad Kurchatova Pl, Moscow, Russia
来源：
MATERIALS & DESIGN | 2018年 / 147卷
基金：
中国国家自然科学基金;
关键词：
Weld residual stress; Low-temperature transformation; Transformation-induced plasticity; FATIGUE-CRACK GROWTH; STAINLESS-STEEL; PHASE-TRANSFORMATION; CARBON-STEEL; PREDICTION; STRENGTH; MODEL; MARTENSITE; EVOLUTION; BEHAVIOR;
D O I：
10.1016/j.matdes.2018.03.032
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this study, the weld residual stresses (RS) in a 25 mm thick ferrite steel plate with newly developed low-temperature transformation (LTT) welding wire were investigated by finite element method and neutron diffraction (ND) measurement. A thermo-elastic-plastic finite element model coupled with solid-state phase transformation (SSPT) was developed to investigate the distribution and formation mechanism of RS, which has been verified by ND measurement. The results demonstrate that the developed LTT alloy can significantly reduce the RS and even generate compressive RS in the weld zone, due to the interrupted cooling shrinkage caused by the LTT. The higher inter-pass temperatures related to the microstructure evolution result in an increased region of compressive stress within the weldment. Moreover, the longitudinal RS in the weld zone gradually changes to tension as the initial temperature of martensitic transformation increases. Notably, the relaxation effect of transformation-induced plasticity on RS and its influence on model accuracy were discussed. (C) 2018 Elsevier Ltd. All rights reserved.
引用
收藏
页码：65 / 79
页数：15
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