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Vol.7 No.2previousAASP15 (106-107-108-109-110-111)-AA112-113-NT71

Academic Articles
Regular Paper Vol.7No.2 (2015) p.189 - p.198
 

Sustainability of compressive residual stress by stress improvement processes

 
Satoru NISHIKAWA1, Shigeru OKITA2, Atsunori YAMAGUCHI3
 
1 Japan Power Engineering and Inspection Corporation, 14-1 Bentencho, Tsurumi-ku Yokohama, 230-0044, Japan
2 Japan Power Engineering and Inspection Corporation, 14-1 Bentencho, Tsurumi-ku Yokohama, 230-0044, Japan
3 Japan Power Engineering and Inspection Corporation, 14-1 Bentencho, Tsurumi-ku Yokohama, 230-0044, Japan
 
Abstract
Stress improvement processes are countermeasures against stress corrosion cracking in nuclear power plant components. It is necessary to confirm whether a compressive residual stress induced by stress improvement processes can be sustained under operation environment. In order to evaluate stability of the compressive residual stress in 60-year operating conditions, the 0.07% cyclic strains of 200 times at 593 K were applied to the welded specimens, then a thermal aging treatment for 1.66×106 s at 673 K was carried out. As the result, it was confirmed that the compressive residual stresses were sustained on both surfaces of the dissimilar welds of austenitic stainless steel (SUS316L) and nickel base alloy (NCF600 and alloy182) processed by laser peening (LP), water jet peening (WJP), ultrasonic shot peening (USP), shot peening (SP) and polishing under 60-year operating conditions.
 
Keywords
Stress improvement processes, Sustainability of the compressive residual stress, Austenitic stainless steel, Nickel base alloy, LP, WJP, USP, SP, Polishing
 
Full Paper: PDF EJAM Vol.7 No.2 pp.189-198 "Sustainability of compressive residual stress by stress improvement processes"















Article Information
Article history:
Received 15 Junuary 2015
Accepted 19 August 2015