Abstract
The influence of heat treatment processes, which consist of a quenching partitioning (QP) process, intercritical annealing (IA) process and warm rolling (WR) process, on the hydrogen embrittlement (HE) of medium Mn steels is investigated. The corresponding experimental specimens are labeled QP160, IA810 and WR760, respectively. WR760 reveals the best mechanical properties, and the corresponding product strength and elongation (PSE) is 42.9 GPa•%; nevertheless, HE susceptibility is the lowest due to fine grains and microcrack propagation paths, which are parallel to rolling direction (RD), and they relax the triaxial stress conditions ahead of the main transverse crack's tip. IA810 (PSE = 29.1 GPa•%) shows the highest HE susceptibility due to the extremely unstable γ, which makes the microcrack propagation along the interface of γ(α′)/α-ferrite occur more easily when there is hydrogen. Compared to IA810, QP160 (PSE = 17.6 GPa•%) reveals a lower HE susceptibility due to the higher γ stability.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
