文献类型：期刊文献

中文题名：中子衍射和有限元法研究不锈钢复合板补焊残余应力

英文题名：A STUDY OF RESIDUAL STRESS IN THE REPAIR WELD OF STAINLESS STEEL CLAD PLATE BY NEUTRON DIFFRACTION MEASUREMENT AND FINITE ELEMENT METHOD

作者：蒋文春[1,2];W00 Wanchuck[2];王炳英[3];涂善东[4]

机构：[1]中国石油大学(华东)化学工程学院重质油国家重点实验室,青岛266580;[2]Korea Atomic Energy Research Institute,Daejeon,305-353,South Korea;[3]中国石油大学(华东)机电工程学院,青岛266580;[4]华东理工大学机械与动力工程学院承压系统安全科学教育部重点实验室,上海200237

年份：2012

卷号：48

期号：12

起止页码：1525

中文期刊名：金属学报

外文期刊名：Acta Metallurgica Sinica

收录：CSTPCD;;EI(收录号：20130415931741);Scopus;WOS:【SCI-EXPANDED(收录号:WOS:000312687800017)】；北大核心:【北大核心2011】；CSCD:【CSCD2011_2012】；

基金：Supported by National Natural Science Foundation of China (No.51105380), Doctoral Program of Higher Education of China (No.20100133120008) and Natural Science Foundation of Shandong Province (No.ZR2010AQ002)

语种：中文

中文关键词：不锈钢复合板,补焊,残余应力,中子衍射,有限元

外文关键词：stainless steel clad plate, repair weld, residual stress, neutron diffraction, finiteelement method

摘要：利用中子衍射和有限元法分析不锈钢复合板补焊残余应力,结果表明:计算结果与测试结果具有一致性.焊缝和热影响区产生了较高的残余应力,远离热影响区,残余应力逐渐降低.由于局部补焊加热,沿厚度方向产生了弯曲应力;在不锈钢覆层,最大残余应力位于热影响区,由于加工硬化的影响,其值已超过屈服强度.因此,采用常规标准假设会使评定结果与实际存在差异,利用中子衍射与有限元法相结合,不仅可以准确获得残余应力大小,而且可以获得沿厚度方向分布的残余应力,满足安全评定标准有关处理焊接残余应力的要求.
Stainless steel clad plate is widely used in petrochemical engineering because of its high strength and good corrosion resistance, but there are cracks to be always generated in clad metal during the fabrication and service. Welding is often used to repair the cracked zone in stainless steel clad plates, but the residual stress is generated inevitably during welding, which has a great effect on their structure integrity. Chinese code, safety assessment for in-service pressure vessels containing defects, requires through-thickness stress distribution, and assumes that the secondary membrane stress induced by welding is equal to the yield stress, and the bending stress is zero. This work uses a combination of neutron diffraction method and finite element method （FEM） to determine the residualstress in the repair weld of a stainless steel clad plate. It is found that there is a good agreement between FEM and experimental results. The residual stress is concentrated in the heat affected zone （HAZ） of the weld metal, and decreases gradually far away from this zone. Due to the local heating input difference through thickness of the clad plate, a bending stress is generated in it. In the clad metal, the maximum stress is located at HAZ, which has exceeded the yield strength because of work hardening. Therefore, the assessment result based on the code assumption would lead to a big difference from the actual one. The combined use of FEM and neutron diffraction can obtain both the stress values and through-thickness stress distribution, which meet the requirement how to treat the welding residual stress in the structure integrity assessment code.