Response of Hydrogen Desorption and Hydrogen Embrittlement to Precipitation of Nanometer-Sized Copper in Tempered Martensitic Low-Carbon Steel
Journal
JOM
Journal Volume
71
Journal Issue
4
Pages
1349-1356
Date Issued
2019
Author(s)
Abstract
This work is aimed at studying the hydrogen–copper precipitate interaction in a martensitic steel. Analysis of hydrogen thermal desorption revealed that precipitation of copper particles enhances the hydrogen trapping capability of tempered copper-containing martensitic steel. Moreover, precipitation of copper could make hydrogen retain longer in the steel, indicating a retarded diffusion of hydrogen. Copper precipitates as a hydrogen trapping site were observed to preserve an activation energy of 35.6 kJ mol −1 by Choo-and-Lee method after release for 4 h at room temperature. This value is higher than the activation energy of dislocation. Moreover, tempered steel with copper particles displayed better resistance to hydrogen embrittlement in notched, slow-strain-rate tensile tests.
Publisher
Minerals, Metals and Materials Society
Type
journal article