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http://dx.doi.org/10.3795/KSME-A.2017.41.11.1011

Study on VHCF Fatigue Behaviors and UNSM Effects of Hydrogen Attacked STS 316L  

Nahm, Seung-Hoon (Korea Research Institute of Standards and Science)
Baek, Un-Bong (Korea Research Institute of Standards and Science)
Suh, Chang-Min (School of Mechanical Engineering, Kyungpook Nat'l Univ., DMI)
Pyun, Young-Sik (Dept. of Mechanical Engineering, Sun Moon Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.41, no.11, 2017 , pp. 1011-1020 More about this Journal
Abstract
This study was conducted to investigate the material properties of stainless steel 316L specimens of untreated and UNSM treated material, hydrogen attacked material(100 bar, $300^{\circ}C$ at 120 h) and UNSM treated hydrogen attacked material at room temperature. Results demonstrated that the hydrogen attacked materials showed a tendency toward a slightly decreased fatigue strength, while the hydrogen embrittlement effect was smaller than the S-N curve of conventional untreated material. As compared to untreated material, the fatigue limit of the UNSM treated material increased by 43.8%, while it was 57.1％ higher in the UNSM treated hydrogen attacked material than in untreated hydrogen attacked material. The plastic deformation layer was ${\sim}152{\mu}m$ thick, as confirmed by maps showing the level of local plastic deformation affected by the UNSM treatment in three ways: an image quality map, inverse pole figure map, and kernel average misorientation map captured via electron back scatter diffraction. Owing to hydrogen embrittlement, about 90％ of surface cracks were smaller than the average grain size of $35{\mu}m$.
Keywords
Hydrogen Induced Surface Cracks; STS 316L; Ultrasonic Nanocrystal Surface Modification; Rotary Bending Fatigue Test; EBSD(Electron Back Scatter Diffraction);
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Times Cited By KSCI : 2  (Citation Analysis)
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