Abstract
The use of hydrogen in iron and steel has the potential to improve mechanical properties via altering the phase stability and dislocation behavior. When hydrogen is introduced under several gigapascals, a stoichiometric composition of hydrogen can be introduced for steel compositions. In this study, a face-centered cubic (fcc) stainless steel was hydrogenated under several gigapascals. When the steel was not hydrogenated, the microstructure after depressurization was an fcc with a hexagonal close-packed (hcp) structure. In contrast, the hydrogenation treatment resulted in a fine lath body-centered cubic (bcc) structure arising from diffusionless transformation. In particular, the bcc phase formed through the following transformation sequence: fcc → hcp → dhcp (double hexagonal close-packed phase) → bcc. That is, the use of hydrogenation treatment realized fine microstructure evolution through a new type of diffusionless transformation sequence, which is expected to be used in future alloy design strategies for developing high-strength steels.
Highlights
The use of hydrogen in iron and steel has the potential to improve mechanical properties via altering the phase stability and dislocation behavior
The microstructure consisted of an fcc phase along with a small amount of a bcc phase
The bcc phase is known to form without diffusion of substitutional atoms
Summary
The use of hydrogen in iron and steel has the potential to improve mechanical properties via altering the phase stability and dislocation behavior. After depressurization at 293 K, the microstructure without hydrogenation remained in the fcc phase and contained plate-like products, as shown in Fig. 2a and b.
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