Research of Hydrogen Embrittlement Behavior in Alloy Steels
A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Metal Failure Analysis".
Deadline for manuscript submissions: closed (30 September 2023) | Viewed by 1292
Special Issue Editor
Interests: fracture and failure analysis; materials characterization; corrosion; mechanical properties
Special Issues, Collections and Topics in MDPI journals
Special Issue Information
Dear Colleagues,
The ingress of hydrogen into the microstructure of steel alloys may create severe failure. This failure decreases the ductility and strength of steel. This problem arises due to the small size of hydrogen atoms, which enables them to diffuse through different microstructural defects. Several theories about hydrogen degradation in steel alloys, including the internal pressure theory, hydrogen-enhanced decohesion, and hydrogen-enhanced localized plasticity. Based on the internal pressure theory, hydrogen atoms diffuse through the steel microstructure and accumulate in hydrogen traps such as grain boundaries, interstitials, voids, and the space between the inclusions and metal matrix. The combination of hydrogen atoms forms hydrogen molecules. This process creates a high amount of pressure, and when this pressure reaches a critical value, the hydrogen-induced cracks initiate. In the hydrogen-enhanced decohesion theory, the hydrogen atoms diffuse through different defects and weaken the interatomic bonds leading to a break of atomic binding to start slipping. Finally, according to hydrogen-enhanced localized plasticity theory, the mobility of dislocations is increased in the presence of solute atoms, leading to a decrease in the required stress for dislocation movement. In steel alloys suffering from hydrogen embrittlement, both intergranular and transgranular cracks are observed, and these steels show fractures, which are far below the non-affected steels yield strength. The level of hydrogen embrittlement in steel alloys depends on various factors such as steel microstructure, the distribution of inclusions and precipitates, the density of hydrogen traps and dislocations, grain size, residual stress, and crystallographic texture.
Dr. Mohammad Ali Mohtadi-Bonab
Guest Editor
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Keywords
- hydrogen embrittlement
- steel alloys
- microstructure
- failure, dislocation
- crystallographic texture
- crack
- ductility
