期刊
INTERNATIONAL JOURNAL OF OFFSHORE AND POLAR ENGINEERING
卷 30, 期 4, 页码 478-486出版社
INT SOC OFFSHORE POLAR ENGINEERS
DOI: 10.17736/ijope.2020.oa24
关键词
Hydrogen embrittlement; phase transformation; phase-field method; Allen-Cahn formulation; hydride precipitation; mode I crack; grain boundary
Crack-induced hydride formation can occur in specific metallic structures, reducing their mechanical properties and facilitating failure. Grain boundaries are observed to be preferential sites for hydride formation. We present a phase-field approach describing the kinetics of crack-induced hydride formation at a grain boundary, by using the Allen-Cahn formulation and including the increase in grain boundary energy. Hydride development is found to occur at the crack tip and in the grain boundary. These regions seemingly evolve independently, except when the crack is very close to or lies in the grain boundary.
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