Law of fracture life for directionally solidified and poly-crystal nickel-base super alloys (CM247LC and IN100) under creep–fatigue conditions based on non-equilibrium science

Article type: Research Article

Authors: Yokobori, Jr., A.T.^; | Sugiura, R. | Takeuchi, H. | Ozeki, G. | Ishida, A. | Kobayashi, D. | Hosono, S.

Affiliations: Graduate School of Engineering, Tohoku University, Sendai, Japan | Electric Power Research and Development Center, Chubu Electric Power, Nagoya, Japan

Note: [] Address for correspondence: A.T. Yokobori, Jr., Faculty of Graduate School of Engineering, Tohoku University, Aoba 6-6-01, Aramaki, Aoba-ku, Sendai-shi 980-8579, Miyagi, Japan. E-mail: yokobori@md.mech.tohoku.ac.jp

Abstract: Nickel-base super-alloys strengthening by precipitation of γ' phase are used as a heat resistant material in gas turbines for electric power plant and jet engine. They were severely subjected to creep (time dependent mechanism, TD) and strain/stress controlled fatigue conditions (cyclic dependent condition, CD). In this paper, sophisticated investigation and analyses on the load frequency characteristics of fracture life under creep and fatigue conditions were conducted based on catastrophic function for nickel-based super alloys, CM247LC (directionally solidified nickel-base material, DS) and these results were compared with those of IN100 (polycrystalline nickel-base material).

Keywords: Nickel-base superalloy, CM247LC, IN100, fracture life, creep–fatigue interaction, Q* concept, non-equilibrium science

DOI: 10.3233/SFC-130154

Journal: Strength, Fracture and Complexity, vol. 8, no. 1, pp. 25-44, 2013