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A Study on the VHCF Fatigue Behaviors of Hydrogen Attacked Inconel 718 Alloy

수소취화된 인코넬 718의 VHCF(Very High Cycle Fatigue) 피로특성에 관한 연구

Suh, Chang-Min;Nahm, Seung-Hoon;Kim, Jun-Hyong;Pyun, Young-Sik
서창민;남승훈;김준형;편영식

  • Received : 2016.01.06
  • Accepted : 2016.05.04
  • Published : 2016.07.01

Abstract

This study is to investigate the influence of hydrogen attack and UNSM on fatigue behaviors of the Inconel 718 alloy. The decrease of the fatigue life between the untreated and the hydrogen attacked material is 10-20%. The fatigue lives of hydrogen attacked specimen decreased without a fatigue limit, similar to those of nonferrous materials. Due to hydrogen embrittlement, about 80% of the surface cracks were smaller than the average grain size of $13{\mu}m$. Many small surface cracks caused by the embrittling effect of hydrogen attack were initiated at the grain boundaries and surface scratches. Cracks were irregularly distributed, grew, and then coalesced through tearing, leading to a reduction of fatigue life. Results revealed that the fatigue lives of UNSM-treated specimens were longer than those of the untreated specimens.

Keywords

Hydrogen Attack;Hydrogen Induced Surface Cracks;Inconel 718 Alloy;Ultrasonic Nanocrystal Surface Modification;Rotary Bending Fatigue Test

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Cited by

  1. Very High Cycle Fatigue Behaviors and Surface Crack Growth Mechanism of Hydrogen-Embrittled AISI 304 Stainless Steels vol.09, pp.04, 2018, https://doi.org/10.4236/msa.2018.94027

Acknowledgement

Grant : 수소의 전환/저장/이용을 위한 안전측정기술개발

Supported by : 국가과학기술연구회