基于微观机理的S30408不锈钢母材及其焊缝延性断裂性能研究

王嘉昌; 郑宝锋; 何杰; 杨将

doi:10.3724/j.gyjzG23091910

基于微观机理的S30408不锈钢母材及其焊缝延性断裂性能研究

doi: 10.3724/j.gyjzG23091910

王嘉昌^1,2,
郑宝锋^2,3,
何杰¹,
杨将¹

1. 中国电建集团华东勘测设计研究院有限公司, 杭州 311122;
2. 东南大学土木工程学院, 南京 211189;
3. 东南大学混凝土及预应力混凝土结构教育部重点实验室, 南京 211189

详细信息

作者简介:
王嘉昌,博士,主要从事钢结构和组合结构设计与研究。电子信箱:wang_jc3@hdec.com

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出版历程
- 收稿日期: 2023-09-19
- 网络出版日期: 2025-10-24

Research on Micromechanical Ductile Fracture Properties of Austenitic Stainless Steel S30408 Base Metal and Welds

1. Powerchina Huadong Engineering Corporation Limited, Hangzhou 311122, China;
2. School of Civil Engineering, Southeast University, Nanjing 211189, China;
3. Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, Nanjing 211189, China

摘要

摘要: 为校准奥氏体S30408不锈钢母材、焊缝纵向和横向、热影响区纵向和横向5种材料基于微观机理的断裂模型参数,进行了标准圆棒和缺口圆棒拉伸试验及其断口的扫描电镜试验,获得各材料的本构参数和特征长度。结合有限元方法模拟缺口圆棒试件的加载全过程,采用空穴增长模型VGM和应力修正临界应变模型SMCS标定各材料的微观断裂韧性参数。研究结果表明:奥氏体S30408不锈钢焊缝材料的断裂韧性参数α和η值均小于母材和热影响区材料,表明焊缝材料更容易启裂;标定的断裂韧性参数离散系数均小于12%,验证了基于微观机理的断裂模型预测奥氏体S30408不锈钢母材、焊缝和热影响区材料延性断裂的有效性;对比普通碳钢材料,奥氏体不锈钢S30408母材的断裂韧性明显更好,但不锈钢焊缝最差。
- 奥氏体S30408不锈钢 /
- 焊缝 /
- 微观断裂模型 /
- 单调拉伸试验 /
- 参数校准
Abstract: In order to calibrate the micromechanism-based fracture model parameters for five austenitic stainless steel S30408 materials—base metal, longitudinal welds, transverse welds, longitudinal heataffected zone (HAZ), and transverse HAZ—standard smooth round bar tensile tests and notched round bar tensile tests were conducted, along with scanning electron microscopy (SEM) examination of the fracture surfaces. These tests provided the constitutive parameters and characteristic lengths for each material. The entire loading process of the notched round bar specimen was simulated using the finite element method (FEM), and the micromechanical fracture toughness parameters for each material were calibrated based on the Void Growth Model (VGM) and the Stress-Modified Critical Strain (SMCS) model. The results showed that the values of the toughness parameters α and η for S30408 welds were smaller than those of the base metal and the HAZ material, indicating that the weld material was more prone to cracking. The calibrated fracture toughness parameters all exhibited coefficients of variation less than 12%, which validated the effectiveness of the micromechanism-based fracture model in predicting ductile fracture of austenitic stainless steel S30408 base metal, welds, and HAZ materials. Compared to conventional carbon steel, the base metal of austenitic stainless steel S30408 exhibited significantly superior fracture toughness, while its welds demonstrated the poorest performance.
- austenitic stainless steel S30408 /
- weld /
- micromechanical fracture model /
- monotonic tensile tests /
- parameter calibration

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