Abstract
Effect of equal-channel angular pressing (ECAP) and current density of cathodic hydrogen charging on hydrogen trapping in the low-alloy steel
Highlights
A large group of deformation processing techniques collectively termed as severe plastic deformation (SPD) methods have been devised in materials science and engineering community in the last few decades for the fabrication of materials with enhanced properties [1, 2]
The low-alloy steel grade 09G2S subjected to equal channel angular pressing (ECAP) occludes more diffusible hydrogen than the same steel in the as-received hot-rolled state at the same cathodic hydrogen charging conditions
The high hydrogen-uptake capacity of the ECAPed steel is due to the increased density of grain boundaries and dislocations — both serving as traps for diffusible hydrogen
Summary
A large group of deformation processing techniques collectively termed as severe plastic deformation (SPD) methods have been devised in materials science and engineering community in the last few decades for the fabrication of materials with enhanced properties [1, 2]. Concerning the HE phenomenon in iron-based alloys with the ultrafine grain (UFG) microstructure produced by SPD, the attention has been paid mostly to austenitic steels whose resistance to HE was either improved or not affected by SPD processing [7 – 9]. Mine et al [9] demonstrated no change in the tensile strength of the SPD-processed specimens of 310S austenitic stainless steel after high temperature gaseous charging up to 40 mass ppm concentration of hydrogen. Astafurova et al [8] concluded that the highly defective grain-subgrain microstructure with the high dislocation density alleviates hydrogen embrittlement effects in UFG Cr-Ni-Mo and Cr-Ni-Ti steels. Mine et al demonstrated that the reduced HE resistance of the Fe-0.01 % C alloy processed by SPD can be entirely recovered by annealing which results in the decrease of the dislocation density and low-angle grain boundaries serving as hydrogen traps [5]. Despite the importance of the results of these studies, the data on HE in UFG steels is still scarce and the development of UFG steels with low susceptibility to hydrogen damages is still challenging
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