Overview of metastability and compositional complexity effects for hydrogen-resistant iron alloys: Inverse austenite stability effects
Name
12EFM_entropy_hcp_overview.pdf
Description
Accepted version
Size
2.78 MB
Format
Adobe PDF
Checksum (MD5)
22a2e6bd6aac6c3de67a0197757e1b2c
Author(s)
Koyama, Motomichi
Tasan, Cemal Cem
Tsuzaki, Kaneaki
Date Issued
2019
Journal
Engineering Fracture Mechanics
Publisher
Elsevier BV
Version
Author's final manuscript
Abstract
© 2019 Elsevier Ltd 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.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Terms of Use
Creative Commons Attribution-NonCommercial-NoDerivs License
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1016/j.engfracmech.2019.03.049
