Temperature dependence of fatigue crack growth in low-carbon steel under gaseous hydrogen

Osamu Takakuwa, Yuhei Ogawa, Saburo Okazaki, Hisao Matsunaga, Saburo Matsuoka

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In order to elucidate the temperature dependence of hydrogen-assisted fatigue crack growth (HAFCG), the fatigue crack growth (FCG) test was performed on low-carbon steel JISSM490B according to ASTM E647 using compact tension (CT) specimen under 0.7 MPa (≈ 0.1 ksi) hydrogen-gas at room temperature (RT: 298 K (≈ 77 °F)) and 423 K (≈ 302 °F) at stress intensity factor range of ΔK = 30 MPa m1/2 (≈ 27 ksi in1/2). Electron backscatter diffraction (EBSD) observation was performed on the mid-thick section of CT specimen in order to investigate change in plasticity around the crack wake in gaseous hydrogen environment and how it changes due to temperature elevation. The obtained results showed the higher temperature, the lower intense of HAFCG as reported in our previous article. Plasticity around the crack wake became less in gaseous hydrogen environment, especially tested at 298 K. The propensity of the results obtained at higher temperature (423 K) can be separated into two cases: (i) intense plasticity occurs like tested in air, (ii) crack propagates straighter accompanying less plasticity like tested in gaseous hydrogen environment at 298 K. This implies macroscopic FCG rate is determined by combination of microscopic FCG rate in the case (i) and case (ii).

Original languageEnglish
Title of host publicationMaterials and Fabrication
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791858981
DOIs
Publication statusPublished - Jan 1 2019
EventASME 2019 Pressure Vessels and Piping Conference, PVP 2019 - San Antonio, United States
Duration: Jul 14 2019Jul 19 2019

Publication series

NameAmerican Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP
Volume6B-2019
ISSN (Print)0277-027X

Conference

ConferenceASME 2019 Pressure Vessels and Piping Conference, PVP 2019
CountryUnited States
CitySan Antonio
Period7/14/197/19/19

    Fingerprint

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering

Cite this

Takakuwa, O., Ogawa, Y., Okazaki, S., Matsunaga, H., & Matsuoka, S. (2019). Temperature dependence of fatigue crack growth in low-carbon steel under gaseous hydrogen. In Materials and Fabrication (American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP; Vol. 6B-2019). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/PVP2019-93451