TY - JOUR
T1 - Relationship between mechanical response and microscopic crack propagation behavior of hydrogen-related intergranular fracture in as-quenched martensitic steel
AU - Shibata, Akinobu
AU - Gutierrez-Urrutia, Ivan
AU - Okada, Kazuho
AU - Miyamoto, Goro
AU - Madi, Yazid
AU - Besson, Jacques
AU - Tsuzaki, Kaneaki
N1 - Funding Information:
This study was financially supported by JST PRESTO (Grant Number JPMJPR2096 ), JSPS KAKENHI (Grant Numbers JP19H02459 and JP20K21083 ), and the Elements Strategy Initiative for Structural Materials (ESISM) through MEXT Japan.
Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2022/1/13
Y1 - 2022/1/13
N2 - The present study investigated the relationship between the mechanical response and microscopic crack propagation behavior of hydrogen-related intergranular fractures in high-strength martensitic steel. In contrast to cracks in the uncharged specimen, the cracks in the hydrogen-charged specimen propagated under a small crack opening displacement. Crack tip bluntings were frequently observed in the uncharged specimen, whereas no obvious blunting of the tip was observed in the hydrogen-related intergranular cracks. In addition, a high strain was localized around the hydrogen-related intergranular crack tip. The results indicate that strain localization can induce the formation of new quasi-cleavage cracks inside prior austenite grains ahead of the existing crack tip. The hydrogen-enhanced decohesion at prior austenite grain boundaries and the quasi-cleavage crack formation/propagation ahead of the arrested intergranular crack result in hydrogen-related crack propagation with a small crack opening displacement.
AB - The present study investigated the relationship between the mechanical response and microscopic crack propagation behavior of hydrogen-related intergranular fractures in high-strength martensitic steel. In contrast to cracks in the uncharged specimen, the cracks in the hydrogen-charged specimen propagated under a small crack opening displacement. Crack tip bluntings were frequently observed in the uncharged specimen, whereas no obvious blunting of the tip was observed in the hydrogen-related intergranular cracks. In addition, a high strain was localized around the hydrogen-related intergranular crack tip. The results indicate that strain localization can induce the formation of new quasi-cleavage cracks inside prior austenite grains ahead of the existing crack tip. The hydrogen-enhanced decohesion at prior austenite grain boundaries and the quasi-cleavage crack formation/propagation ahead of the arrested intergranular crack result in hydrogen-related crack propagation with a small crack opening displacement.
KW - Crack propagation
KW - Electron backscattering diffraction
KW - Fracture
KW - Hydrogen embrittlement
KW - Martensitic steels
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U2 - 10.1016/j.msea.2021.142288
DO - 10.1016/j.msea.2021.142288
M3 - Article
AN - SCOPUS:85118576311
SN - 0921-5093
VL - 831
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
M1 - 142288
ER -