Effect of hydrogen on the micro- and macro-strain near the surface of austenitic stainless steel

Osamu Takakuwa, Yuta Mano, Hitoshi Soyama

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

Abstract

The objective of this study is to evaluate the effect of hydrogen on the micro- and macro-strain of austenitic stainless steel using X-ray diffraction. When hydrogen is trapped in lattice sites, it can affect both the micro- and macro-strain. The micro-strain was evaluated through fitting profiles to measured X-ray diffraction profile using a fundamental parameter method. The macro-strain, i.e., the residual stress, was evaluated by a 2D method using a two-dimensional PSPC. The experimental samples were charged with hydrogen by a cathodic charging method. The results revealed that the induced residual stress was equi-biaxial and compressive, and that the micro-strain increased. Both of these varied rapidly with increasing hydrogen charging time. Saturation occurred at a compressive stress of around 130 MPa. On reaching saturation, the hydrogen charging was terminated and desorption of hydrogen began at room temperature. Then, the strains decreased and the compressive stress reverted, ultimately, to a tensile stress of 180 MPa. Martensitic transformation occurred due to hydrogen charging and this had a significant effect on the X-ray diffraction profile.

Original languageEnglish
Title of host publicationMaterials Science and Engineering Technology
PublisherTrans Tech Publications Ltd
Pages1298-1302
Number of pages5
ISBN (Print)9783038351023
DOIs
Publication statusPublished - Jan 1 2014
Externally publishedYes
Event2014 International Conference on Materials Science and Engineering Technology, MSET 2014 - Shanghai, China
Duration: Jun 28 2014Jun 29 2014

Publication series

NameAdvanced Materials Research
Volume936
ISSN (Print)1022-6680
ISSN (Electronic)1662-8985

Other

Other2014 International Conference on Materials Science and Engineering Technology, MSET 2014
CountryChina
CityShanghai
Period6/28/146/29/14

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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