Study on Residual Stress of Multi-layer and Multi-pass Butt-welded Joint for Ultra-high Strength Wear-resistant Steel NM500

被引：0
作者：
Hu L. [1 ]
Liu H. [2 ]
Cheng H. [2 ]
Chen W. [1 ]
Feng G. [1 ]
Ye Y. [1 ]
Deng D. [1 ]
机构：
[1] College of Materials Science and Engineering, Chongqing University, Chongqing
[2] Handan Branch, Hebei Iron and Steel Co., Ltd., Handan
来源：
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | 2024年 / 60卷 / 04期
关键词：
numerical simulation; residual stress; solid-state transformation; wear-resistant steel; weld;
D O I：
10.3901/JME.2024.04.335
中图分类号：
学科分类号：
摘要：
Based on SYSWELD software, a “thermo-metallurgical-mechanical” coupling computational approach with consideration of solid-state phase transformation is established to simulate temperature field, fraction of phase and welding residual stress in a multi-layer and multi-pass butt-welded joint of wear-resistant NM500 steel. Meanwhile, microstructure, hardness and surface residual stress distribution of the joint were observed by optical microscope, measured by micro-hardness tester and by hole-drilling method, respectively, and the measured data are compared with the corresponding simulation results. The results show that the simulated melting zone above the melting point of the NM500 steel butt-welded joint is in a good agreement with the actual melting zone, and this proves that the numerical simulation method reproduced the actual welding heat input for the butt-welded joint. For NM500 steel butt-welded joint, the peak value of longitudinal residual stress located the base metal adjacent to the heat-affected zone, and its value is about 1 600 MPa, which is similar to the yield strength of base metal at room temperature. The transverse residual stress distributed in the thickness direction in the shape of “tension - compression – tension”. In general, the magnitude and distribution of longitudinal and transverse residual stresses obtained by numerical simulation are in good agreement with the experimental measurements, which verified the effectiveness of the “thermo-metallurgical-mechanical” coupling computational method. Based on the numerical simulation results, the formation mechanism of welding residual stress in NM500 steel multi-layer multi-pass butt-welded joint is also investigated. © 2024 Chinese Mechanical Engineering Society. All rights reserved.
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页码：335 / 344
页数：9
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