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Title: Stabilization of the HCP [var epsilon] phase in an Fe-21%Mn alloy subjected to cathodic hydrogen charging

Abstract

Cathodic hydrogen charging induces some phase transformation in the surface layer of FCC iron alloys. Such a hydrogen-induced phase transformation has extensively been studied for austenitic stainless steels, where the FCC [gamma] phase transforms partially into an HCP [var epsilon][sub H] phase. The formation of the [var epsilon][sub H] phase has also been found in FCC Fe-Mn alloys and Fe-Ni-Mn alloys. The [var epsilon][sub H] phase is unstable in the absence of hydrogen and decomposes to an [var epsilon] martensite in the metastable FCC alloys. In order to make clear the nature of the [var epsilon][sub H] phase, it is necessary to reveal the stability of the [var epsilon] phase in FCC iron alloys during cathodic hydrogen charging. In the present study, the authors employed an Fe-21%Mn alloy which consisted of a mixture of the [gamma] and [var epsilon] phases in an as-quenched state. For this two-phase alloy, the [var epsilon] [r arrow] [gamma] transformation has so far been examined by a high-pressure equilibration method in a hydrogen-gas atmosphere. The purpose of this study is to compare the stability of the [gamma] phases in the two-phase alloy subjected to cathodic hydrogen charging in an aqueous solution. The influence of hydrogenmore » on the [var epsilon] phase stability will be discussed, including the transformation in a hydrogen-gas atmosphere.« less

Authors:
; ;  [1]
  1. Nagoya Inst. of Tech. (Japan)
Publication Date:
OSTI Identifier:
6544791
Resource Type:
Journal Article
Journal Name:
Scripta Metallurgica et Materialia; (United States)
Additional Journal Information:
Journal Volume: 29:1; Journal ID: ISSN 0956-716X
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; IRON ALLOYS; CRYSTAL-PHASE TRANSFORMATIONS; MANGANESE ALLOYS; FCC LATTICES; HYDROGEN EMBRITTLEMENT; PHASE STUDIES; SAMPLE PREPARATION; STABILIZATION; ALLOYS; CRYSTAL LATTICES; CRYSTAL STRUCTURE; CUBIC LATTICES; EMBRITTLEMENT; PHASE TRANSFORMATIONS; 360102* - Metals & Alloys- Structure & Phase Studies

Citation Formats

Aikawa, T, Nishino, Y, and Asano, S. Stabilization of the HCP [var epsilon] phase in an Fe-21%Mn alloy subjected to cathodic hydrogen charging. United States: N. p., 1993. Web. doi:10.1016/0956-716X(93)90268-W.
Aikawa, T, Nishino, Y, & Asano, S. Stabilization of the HCP [var epsilon] phase in an Fe-21%Mn alloy subjected to cathodic hydrogen charging. United States. https://doi.org/10.1016/0956-716X(93)90268-W
Aikawa, T, Nishino, Y, and Asano, S. Thu . "Stabilization of the HCP [var epsilon] phase in an Fe-21%Mn alloy subjected to cathodic hydrogen charging". United States. https://doi.org/10.1016/0956-716X(93)90268-W.
@article{osti_6544791,
title = {Stabilization of the HCP [var epsilon] phase in an Fe-21%Mn alloy subjected to cathodic hydrogen charging},
author = {Aikawa, T and Nishino, Y and Asano, S},
abstractNote = {Cathodic hydrogen charging induces some phase transformation in the surface layer of FCC iron alloys. Such a hydrogen-induced phase transformation has extensively been studied for austenitic stainless steels, where the FCC [gamma] phase transforms partially into an HCP [var epsilon][sub H] phase. The formation of the [var epsilon][sub H] phase has also been found in FCC Fe-Mn alloys and Fe-Ni-Mn alloys. The [var epsilon][sub H] phase is unstable in the absence of hydrogen and decomposes to an [var epsilon] martensite in the metastable FCC alloys. In order to make clear the nature of the [var epsilon][sub H] phase, it is necessary to reveal the stability of the [var epsilon] phase in FCC iron alloys during cathodic hydrogen charging. In the present study, the authors employed an Fe-21%Mn alloy which consisted of a mixture of the [gamma] and [var epsilon] phases in an as-quenched state. For this two-phase alloy, the [var epsilon] [r arrow] [gamma] transformation has so far been examined by a high-pressure equilibration method in a hydrogen-gas atmosphere. The purpose of this study is to compare the stability of the [gamma] phases in the two-phase alloy subjected to cathodic hydrogen charging in an aqueous solution. The influence of hydrogen on the [var epsilon] phase stability will be discussed, including the transformation in a hydrogen-gas atmosphere.},
doi = {10.1016/0956-716X(93)90268-W},
url = {https://www.osti.gov/biblio/6544791}, journal = {Scripta Metallurgica et Materialia; (United States)},
issn = {0956-716X},
number = ,
volume = 29:1,
place = {United States},
year = {1993},
month = {7}
}