TY - JOUR
T1 - Overview of metastability and compositional complexity effects for hydrogen-resistant iron alloys
T2 - Inverse austenite stability effects
AU - Koyama, Motomichi
AU - Tasan, Cemal Cem
AU - Tsuzaki, Kaneaki
N1 - Funding Information:
This work was financially supported by the Japan Science and Technology Agency (JST) (grant number: 20100113 ) under the Industry–Academia Collaborative R&D Program and JSPS KAKENHI ( JP16H06365 and JP17H04956 ).
Funding Information:
This work was financially supported by the Japan Science and Technology Agency (JST) (grant number: 20100113) under the Industry?Academia Collaborative R&D Program and JSPS KAKENHI (JP16H06365 and JP17H04956).
Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2019/6/1
Y1 - 2019/6/1
N2 - The main factors affecting resistance to hydrogen-assisted cracking are hydrogen diffusivity and local ductility. In this context, we note fcc (γ) to hcp (ε) martensitic transformation, instead of γ to bcc (ά) martensitic transformation. The γ-ε martensitic transformation decreases the local hydrogen diffusivity, which thereby can increase strength without critical deterioration of hydrogen embrittlement resistance. Furthermore, ε-martensite in a high-entropy alloy is extraordinary ductile. Consequently, the metastable high-entropy alloys showed lower fatigue crack growth rates under a hydrogen effect compared with those of conventional metastable austenitic steels such as type 304.
AB - The main factors affecting resistance to hydrogen-assisted cracking are hydrogen diffusivity and local ductility. In this context, we note fcc (γ) to hcp (ε) martensitic transformation, instead of γ to bcc (ά) martensitic transformation. The γ-ε martensitic transformation decreases the local hydrogen diffusivity, which thereby can increase strength without critical deterioration of hydrogen embrittlement resistance. Furthermore, ε-martensite in a high-entropy alloy is extraordinary ductile. Consequently, the metastable high-entropy alloys showed lower fatigue crack growth rates under a hydrogen effect compared with those of conventional metastable austenitic steels such as type 304.
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U2 - 10.1016/j.engfracmech.2019.03.049
DO - 10.1016/j.engfracmech.2019.03.049
M3 - Review article
AN - SCOPUS:85063615416
SN - 0013-7944
VL - 214
SP - 123
EP - 133
JO - Engineering Fracture Mechanics
JF - Engineering Fracture Mechanics
ER -