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| A STUDY OF RESIDUAL STRESS IN THE REPAIR WELD OF STAINLESS STEEL CLAD PLATE BY NEUTRON DIFFRACTION MEASUREMENT AND FINITE ELEMENT METHOD |
| JIANG Wenchun 1,2, WOO Wanchuck 2, WANG Bingying 3, TU Shan–Tung 4 |
1. State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering, China University of Petroleum (East China), Qingdao 266580
2. Korea Atomic Energy Research Institute, Daejeon, 305–353, South Korea
3. College of Mechanical and Electronic Engineering, China University of Petroleum (East China), Qingdao 266580
4. Key Laboratory of Pressure System and Safety (MOE), School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237 |
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Cite this article:
JIANG Wenchun WOO Wanchuck WANG Bingying TU Shan–Tung . A STUDY OF RESIDUAL STRESS IN THE REPAIR WELD OF STAINLESS STEEL CLAD PLATE BY NEUTRON DIFFRACTION MEASUREMENT AND FINITE ELEMENT METHOD. Acta Metall Sin, 2012, 48(12): 1525-1529.
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Abstract 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 residual stress 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.
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Received: 08 June 2012
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| Fund: 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) |
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