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Effect of sigma phase on near-threshold fatigue crack growth behavior and ultrasonic evaluation in AISI 316L stainless steel |
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| Authors: | Bumjoon Kim Jonghoon Lee Jiwoo Im Jongbum Kim Moonki Kim Hakjoon Kim Sungjin Song Byeongsoo Lim |
| Affiliation: | 1. School of Mechanical Engineering, Dongyang Mirae University, Seoul, 152-714, Korea 2. School of Mechanical Engineering, Sungkyunkwan University, Suwon, 440-746, Korea 3. Korea Atomic Energy Research Institute, Dukjindong, Yuseong, Deajeon, 305-353, Korea |
| Abstract: | In this work, we examined the influence of microstructural changes, such as an intermetallic sigma (??) phase, on the fatigue behavior of high-temperature aged AISI 316L stainless steel. Nondestructive ultrasonic test and fatigue crack growth tests were performed to determine the threshold stress intensity factor of these artificially aged specimens. Ultrasonic test results characterizing the microstructural changes were compared with those of the fatigue tests to propose an empirical formula capable of predicting the threshold stress intensity factor by a nondestructive method. We observed a strong correlation between the increase in the volume fraction of the ?? phase and the decrease of ??Kth. Ultrasonic velocity increased in response to the coarsening behavior of the ?? phase in the vicinity of the grain boundaries. |
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