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International Journal of Automotive Technology > Volume 1(2); 2000 > Article
International Journal of Automotive Technology 2000;1(2): 71-77.
CREEP-FATIGUE CRACK GROWTH AND CREEP RUPTURE BEHAVIOR IN TYPE 316 STAINLESS STEELS - EFFECT OF HOLD TIME AND AGING TREATMENT
J. W. IM, S. J. WON, M. J. KIM, B. S. Lim
Sungkyunkwan University
ABSTRACT
High temperature materials in service are subjected to mechanical damage due to operating load and metallurgical damage due to operating temperature. Therefore, when designing or assessing life of high temperature components, both factors must be considered. In this paper, the effect of tensile hold time on high temperature fatigue crack growth and long term prior thermal aging heat treatment on creep rupture behavior were investigated using STS 316L and STS 316 austenitic stainless steels, which are widely used for high temperature components like in automotive exhaust and piping systems. In high temperature fatigue crack growth tests using STS 316L, as tensile hold time increased, crack growth rate decreased in relatively short tensile hold time region. In creep rupture tests with STS 316, as againg time increased, the values of creep stress exponent decreased. In long term aged specimens, cavity type microcracks have been observed at the interface of grain boundary and coarsened carbide.
Key Words: High temperature fatigue crack growth, Hold time, Thermal aging, Creep-rupture
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