Prediction of creep crack initiation and growth for P91 at 600°C using MOD-NSW model

Issue title: Memorial Issue of Prof. Dr Bilal Dogan

Guest editors: A. Saxena, K. Nikbin and A.T. Yokobori Jr.

Article type: Research Article

Authors: Han, Jae-Jun^a | Lee, Han-Sang^a | Kim, Yun-Jae^{a; *} | Kim, Nak-Hyun^b | Kim, Woo-Gon^b | Lee, Hyeong-Yeon^b | Jerng, Dong Wook^c

Affiliations: [a] Department of Mechanical Engineering, Korea University, Seoul, Korea | [b] Korea Atomic Energy Research Institute, Daejeon, Korea | [c] School of Energy Systems Engineering, Chung-Ang University, Seoul, Korea

Correspondence: [*] Address for correspondence: Yun-Jae Kim, Department of Mechanical Engineering, Korea University, Anam-Dong, Sungbuk-Ku, Seoul 136-701, Korea. Tel.: +82 2 3290 3372; Fax: +82 2 926 9290; E-mail: [email protected].

Abstract: In this paper, predictions of creep crack initiation times and growth rates using the NSW-MOD model are compared with experimental data for the parent and weld metals of P91 at 600°C. For the weld metal, creep crack growth rates are found to be bounded by upper and lower bounds of the predictions, but creep crack initiation times are close to the upper bound. For the parent material, creep crack growth rates are bounded by upper and lower bounds of the predictions using the minimum creep rates, but creep crack initiation times are bounded by those using the average creep rates.

Keywords: Creep crack growth rate, creep crack initiation time, analytical analysis, modified NSW model, P91 martensitic steel

DOI: 10.3233/SFC-150184

Journal: Strength, Fracture and Complexity, vol. 9, no. 1, pp. 125-136, 2015