Overview of metastability and compositional complexity effects for hydrogen-resistant iron alloys: Inverse austenite stability effects

被引：36

作者：

Koyama, Motomichi ^{[1
]}

Tasan, Cemal Cem ^{[2
]}

Tsuzaki, Kaneaki ^{[3
,4
]}

机构：

[1] Tohoku Univ, Inst Mat Res, Aoba Ku, 2-1-1 Katahira, Sendai, Miyagi 9808577, Japan

[2] MIT, Dept Mat Sci & Engn, 77 Massachusetts Ave, Cambridge, MA 02139 USA

[3] Kyushu Univ, Dept Mech Engn, Nishi Ku, Motooka 744, Fukuoka, Fukuoka 8190395, Japan

[4] Kyushu Univ, HYDROGENIOUS, Nishi Ku, Motooka 744, Fukuoka, Fukuoka 8190395, Japan

来源：

ENGINEERING FRACTURE MECHANICS | 2019年 / 214卷

基金：

日本科学技术振兴机构;

关键词：

Steels; Hydrogen embrittlement; Fatigue crack growth; Slow strain rate tests; Plasticity; FATIGUE-CRACK GROWTH; HIGH-ENTROPY ALLOYS; MARTENSITIC-TRANSFORMATION; PHASE-TRANSFORMATIONS; STAINLESS-STEELS; EMBRITTLEMENT RESISTANCE; EPSILON-MARTENSITE; NICKEL-EQUIVALENT; TIP DEFORMATION; DESIGN CONCEPT;

D O I：

10.1016/j.engfracmech.2019.03.049

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

The main factors affecting resistance to hydrogen-assisted cracking are hydrogen diffusivity and local ductility. In this context, we note fcc (gamma) to hcp (epsilon) martensitic transformation, instead of gamma to bcc (alpha) martensitic transformation. The gamma-epsilon martensitic transformation decreases the local hydrogen diffusivity, which thereby can increase strength without critical deterioration of hydrogen embrittlement resistance. Furthermore, epsilon-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.

引用

页码：123 / 133

页数：11

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