TY - JOUR
T1 - Non-propagating fatigue cracks in austenitic steels with a micro-notch
T2 - Effects of dynamic strain aging, martensitic transformation, and microstructural hardness heterogeneity
AU - Nishikura, Yuri
AU - Koyama, Motomichi
AU - Yamamura, Yusuke
AU - Ogawa, Takuro
AU - Tsuzaki, Kaneaki
AU - Noguchi, Hiroshi
N1 - Funding Information:
This work was financially supported by JSPS KAKENHI ( JP16H06365 and JP17H04956 ) and the Elements Strategy Initiative for Structural Materials (ESISM) through the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan . M.K. greatly appreciate helpful discussion with Dr. Sawaguchi at National Institute for Materials Science. The Materials Manufacturing and Engineering Station at the National Institute for Materials Science supported this work through the production of the samples.
Publisher Copyright:
© 2018 Elsevier Ltd
PY - 2018/8
Y1 - 2018/8
N2 - The non-propagation limit of a microstructurally small fatigue crack was investigated with respect to dynamic strain aging (DSA), martensitic transformation, and microstructural hardness heterogeneity. In this study, we selected four model alloys: Fe-19Cr-8Ni-0.05C, Fe-19Cr-8Ni-0.14C, Fe-23Mn-0.5C, and as-hot-rolled Fe-30Mn-3Si-3Al steels. Transformation-induced cyclic hardening results in the most significant improvement of the non-propagation limit, i.e., in the case of the Fe-19Cr-8Ni-0.05C steel. Within different contexts, DSA, transformation-induced crack closure, and hardness-heterogeneity-enhanced plasticity-induced crack closure could also realize superior non-propagation limits. The effects of DSA and hardness heterogeneity can be combined with the effects of transformation, which is expected to create a new venue of material design and selection in terms of the crack non-propagation limit.
AB - The non-propagation limit of a microstructurally small fatigue crack was investigated with respect to dynamic strain aging (DSA), martensitic transformation, and microstructural hardness heterogeneity. In this study, we selected four model alloys: Fe-19Cr-8Ni-0.05C, Fe-19Cr-8Ni-0.14C, Fe-23Mn-0.5C, and as-hot-rolled Fe-30Mn-3Si-3Al steels. Transformation-induced cyclic hardening results in the most significant improvement of the non-propagation limit, i.e., in the case of the Fe-19Cr-8Ni-0.05C steel. Within different contexts, DSA, transformation-induced crack closure, and hardness-heterogeneity-enhanced plasticity-induced crack closure could also realize superior non-propagation limits. The effects of DSA and hardness heterogeneity can be combined with the effects of transformation, which is expected to create a new venue of material design and selection in terms of the crack non-propagation limit.
KW - Austenitic steel
KW - Dynamic strain aging
KW - High cycle fatigue
KW - Martensitic transformation
KW - Non-propagating fatigue crack
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U2 - 10.1016/j.ijfatigue.2018.04.027
DO - 10.1016/j.ijfatigue.2018.04.027
M3 - Article
AN - SCOPUS:85046798172
VL - 113
SP - 359
EP - 366
JO - International Journal of Fatigue
JF - International Journal of Fatigue
SN - 0142-1123
ER -