X-ray diffraction measurement of the stacking fault energy reduction induced by hydrogen in an AISI 304 steel

Journal Article · Mon Dec 01 04:00:00 EST 1997 · Scripta Materialia

DOI:https://doi.org/10.1016/S1359-6462(97)00332-1· OSTI ID:556519

Pontini, A E; Hermida, J D ^[1]

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1. Centro Atomico Constituyentes, San Martin (Argentina). Dept. de Materiales

Cathodic charging of hydrogen into AISI 304 steels at high current densities and room temperature produces the same martensitic phases ({var_epsilon} and {alpha}{prime}) as are formed by deformation at 77 K. This phenomenon is interpreted on the assumption that hydrogen lowers the Stacking Fault Energy (SFE) of the austenite. In this way, the high stress gradients resultant from the forced hydrogen absorption would produce the martensitic transformations at room temperature. So, it would be of interest to study the reduction of the SFE of the austenite induced by hydrogen prior to martensitic transformation. The purpose of this work is to measure this reduction in an AISI 304 steel by X-Ray Diffraction (XRD) using bulk samples, in order to avoid the unwanted effects on the microstructure that might arise from cathodic charging of hydrogen into thin foils. The measurements were done at 77 K, 206 K and room temperature (293 K).

• OSTI ID: 556519
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 11 Vol. 37; ISSN 1359-6462; ISSN SCMAF7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AUSTENITE
CRYSTAL DEFECTS
HYDROGENATION
MARTENSITE
ROLLING
SAMPLE PREPARATION
STACKING FAULTS
STAINLESS STEEL-304
TEMPERATURE DEPENDENCE
X-RAY DIFFRACTION