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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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Abstract

In this work, we examined the influence of microstructural changes, such as an intermetallic sigma (σ) 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 σ phase and the decrease of ΔKth. Ultrasonic velocity increased in response to the coarsening behavior of the σ phase in the vicinity of the grain boundaries.

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Authors and Affiliations

  1. School of Mechanical Engineering, Dongyang Mirae University, Seoul, 152-714, Korea

    Bumjoon Kim

  2. School of Mechanical Engineering, Sungkyunkwan University, Suwon, 440-746, Korea

    Bumjoon Kim, Jonghoon Lee, Jiwoo Im, Moonki Kim, Hakjoon Kim, Sungjin Song & Byeongsoo Lim

  3. Korea Atomic Energy Research Institute, Dukjindong, Yuseong, Deajeon, 305-353, Korea

    Jongbum Kim

Authors
  1. Bumjoon Kim
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  2. Jonghoon Lee
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  3. Jiwoo Im
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  4. Jongbum Kim
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  5. Moonki Kim
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  6. Hakjoon Kim
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  7. Sungjin Song
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  8. Byeongsoo Lim
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Correspondence to Byeongsoo Lim.

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Recommended by Editor Jai Hak Park

Bumjoon Kim received his B.S. degree in mechanical engineering in Seoul National University of Science and Technology in 1996. He then received his M.S. and Ph.D. in Sungkyunkwan University in 2001 and 2005, respectively. He is currently an assistant professor in Dongyang Mirae University, School of Mechanical Engineering. His research interests include mechanical materials, strength of materials (mechanical metallurgy), mechanical behavior of materials (creep, fatigue, creep-fatigue interaction), advanced engineering materials, and nondestructive evaluation for material property, degradation.

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Kim, B., Lee, J., Im, J. et al. Effect of sigma phase on near-threshold fatigue crack growth behavior and ultrasonic evaluation in AISI 316L stainless steel. J Mech Sci Technol 26, 3091–3096 (2012). https://doi.org/10.1007/s12206-012-0838-0

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  • DOI: https://doi.org/10.1007/s12206-012-0838-0

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