Evaluation of fatigue life and fatigue limit of circumferentially-notched Type 304 stainless steel in air and hydrogen gas based on crack-growth property and cyclic stress-strain response

Naoaki Nagaishi, Michio Yoshikawa, Saburo Okazaki, Junichiro Yamabe, Fusahito Yoshida, Hisao Matsunaga

Research output: Contribution to journalArticle

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Abstract

Fatigue tests were performed using circumferentially-notched, round bar specimens with a stress concentration factor, Kt, of 6.6 for Type 304, metastable, austenitic stainless steel. The tests were carried out in ambient air and in 0.7 MPa hydrogen gas at room temperature. In a relatively higher stress amplitude regime (i.e., the amplitude resulting in Nf < 105), the hydrogen gas environment caused a marked degradation in fatigue life. In contrast, in a relatively lower stress amplitude regime (i.e., the amplitude resulting in Nf > 105), it appeared that fatigue life did not differ between air and hydrogen gas. It was also confirmed that the fatigue limit appeared not have been degraded in the hydrogen environment though there was a slight difference between the data obtained in two environments. The fatigue life curve and fatigue limit were predicted by assuming that the notch was equivalent to a circumferential crack. Consequently, there was a significant disparity between the prediction and the experimental results. As a result of microscopic observations of the fracture process in combination with elastic-plastic finite element analyses, these discrepancies were attributed to (i) complex cyclic plastic deformation behavior under large- and small-scale yielding conditions within the vicinity of the notch root, (ii) the retardation of crack initiation in the finite life regime, and (iii) the absence of non-propagating cracks at the fatigue limit, all of which are typical characteristics of metastable austenitic stainless steel.

Original languageEnglish
Pages (from-to)164-177
Number of pages14
JournalEngineering Fracture Mechanics
Volume215
DOIs
Publication statusPublished - Jun 15 2019

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Stainless Steel
Hydrogen
Crack propagation
Stainless steel
Gases
Fatigue of materials
Air
Austenitic stainless steel
Cracks
Crack initiation
Stress concentration
Plastic deformation
Plastics

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Evaluation of fatigue life and fatigue limit of circumferentially-notched Type 304 stainless steel in air and hydrogen gas based on crack-growth property and cyclic stress-strain response. / Nagaishi, Naoaki; Yoshikawa, Michio; Okazaki, Saburo; Yamabe, Junichiro; Yoshida, Fusahito; Matsunaga, Hisao.

In: Engineering Fracture Mechanics, Vol. 215, 15.06.2019, p. 164-177.

Research output: Contribution to journalArticle

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