Modeling of residual stress mitigation in austenitic stainless steel pipe girth weldment
- Oregon Graduate Inst., Portland, OR (United States)
- Westinghouse Savannah River Co., Aiken, SC (United States)
This study provides numerical procedures to model 40-cm-diameter, schedule 40, Type 304L stainless steel pipe girth welding and a newly proposed post-weld treatment. The treatment can be used to accomplish the goal of imparting compressive residual stresses at the inner surface of a pipe girth weldment to prevent/retard the intergranular stress corrosion cracking (IGSCC) of the piping system in nuclear reactors. This new post-weld treatment for mitigating residual stresses is cooling stress improvement (CSI). The concept of CSI is to establish and maintain a certain temperature gradient across the pipe wall thickness to change the final stress state. Thus, this process involves sub-zero low temperature cooling of the inner pipe surface of a completed girth weldment, while simultaneously keeping the outer pipe surface at a slightly elevated temperature with the help of a certain heating method. Analyses to obtain quantitative results on pipe girth welding and CSI by using a thermo-elastic-plastic finite element model are described in this paper. Results demonstrate the potential effectiveness of CSI for introducing compressive residual stresses to prevent/retard IGSCC. Because of the symmetric nature of CSI, it shows great potential for industrial application.
- Research Organization:
- Westinghouse Savannah River Co., Aiken, SC (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC09-89SR18035
- OSTI ID:
- 10126109
- Report Number(s):
- WSRC-MS-94-080; CONF-931234-8; ON: DE94007184; TRN: 94:005599
- Resource Relation:
- Conference: American Welding Society international conference on modeling and control of joining processes,Orlando, FL (United States),8-10 Dec 1993; Other Information: PBD: [1994]
- Country of Publication:
- United States
- Language:
- English
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