TY - JOUR

T1 - A carbon-stabilized austenitic steel with lower hydrogen embrittlement susceptibility

AU - Khanchandani, Heena

AU - Zeiler, Stefan

AU - Strobel, Lucas

AU - Göken, Mathias

AU - Felfer, Peter

N1 - Publisher Copyright: © 2023 The Authors. Steel Research International published by Wiley-VCH GmbH.

PY - 2024/2

Y1 - 2024/2

N2 - High-strength steels are susceptible to H-induced failure, which is typically caused by the presence of diffusible H in the microstructure. The diffusivity of H in austenitic steels with face-centered cubic (fcc) crystal structure is slow. The austenitic steels are hence preferred for applications in the hydrogen-containing atmospheres. However, the fcc structure of austenitic steels is often stabilized by the addition of Ni, Mn, or N, which are relatively expensive alloying elements to use. Austenite can kinetically also be stabilized using C. Herein, an approach is applied to a commercial cold work tool steel, where C is used to fully stabilize the fcc phase. This results in a microstructure consisting of only austenite and M 7C 3 carbide. An exposure to H by cathodic hydrogen charging exhibits no significant influence on the strength and ductility of the C-stabilized austenitic steel. While this material is only a prototype based on an existing alloy of different purposes, it shows the potential for low-cost H-resistant steels based on C-stabilized austenite.

AB - High-strength steels are susceptible to H-induced failure, which is typically caused by the presence of diffusible H in the microstructure. The diffusivity of H in austenitic steels with face-centered cubic (fcc) crystal structure is slow. The austenitic steels are hence preferred for applications in the hydrogen-containing atmospheres. However, the fcc structure of austenitic steels is often stabilized by the addition of Ni, Mn, or N, which are relatively expensive alloying elements to use. Austenite can kinetically also be stabilized using C. Herein, an approach is applied to a commercial cold work tool steel, where C is used to fully stabilize the fcc phase. This results in a microstructure consisting of only austenite and M 7C 3 carbide. An exposure to H by cathodic hydrogen charging exhibits no significant influence on the strength and ductility of the C-stabilized austenitic steel. While this material is only a prototype based on an existing alloy of different purposes, it shows the potential for low-cost H-resistant steels based on C-stabilized austenite.

KW - atom probe tomography

KW - austenite stabilizations

KW - diffusible hydrogen

KW - electron backscatter diffractions

KW - hydrogen embrittlements

UR - http://www.scopus.com/inward/record.url?scp=85174913448&partnerID=8YFLogxK

U2 - 10.1002/srin.202300372

DO - 10.1002/srin.202300372

M3 - Article

VL - 95.2024

JO - Steel research international

JF - Steel research international

SN - 0177-4832

IS - 2

M1 - 2300372

ER -