A Study on the Correlation between Advanced Small Punch Test and Charpy V-notch Test on X20CrMoV121 and 2.25Cr1Mo steels Weldment

Lee, Dong-Hwan; Kim, Hyoung-Sup

Journal of KWJS 2008;26(3):37-44.
Published online July 31, 2008.

X20CrMoV121강과 2.25Cr1Mo강 용접부의 ASP 시험과 CVN 충격시험의 상관관계에 대한 연구

A Study on the Correlation between Advanced Small Punch Test and Charpy V-notch Test on X20CrMoV121 and 2.25Cr1Mo steels Weldment

Dong-Hwan Lee, Hyoung-Sup Kim

Abstract

Charpy V-Notch test is commonly used to evaluate fracture toughness. However, since the region to be evaluated is limited to bulk material due to the specimen size required, individual evaluation of microstructures on weldment is very difficult. In this study, ASP(Advanced Small Punch) test was carried out to evaluate material degradation and fracture toughness on the B.M, W.M and each micro-structures of HAZ for X20CrMoV121 and 2.25Cr1Mo steels with artificial aging time. In addition, to evaluate fracture toughness and material degradation of B.M and W.M of X20CrMoV121 steels with aging times, CVN (Charpy V-notch) test was performed. And then the correlation between ASP and CVN test on X20CrMoV121 steels was obtained. Furthermore, through this correlation, material degradation property of each microregion of the HAZ in weldment, which was impossible to be evaluated by the CVN test, can be estimated and determined.

Key Words: Advanced Small Punch (ASP) Test, Conventional Small Punch(CSP) Test, Material Degradation, Heat Affected Zone (HAZ), Ductile-Brittle Transition Temperature(DBTT)