Influence of the mode of deformation and hydrogenation on mechanical properties of 40X steel with surface nanostructure

Keywords

surface nanostructure, severe plastic deformation, physicomechanical proper¬ties, hydrogen.

Cite as

Kyryliv V. I., Maksymiv O. V., Hurey I. V., Tsizh B. R., Gurey V. I., and Kulyk Yu. O. Influence of the mode of deformation and hydrogenation on mechanical properties of 40Kh steel with surface nanostructure. Physicochemical Mechanics of Materials. 2024. 60(2), 063-069.

https://doi.org/10.15407/pcmm2024.02.063

Abstract

The influence of the unidirectional and multidirectional mode of severe plastic deforma­tion generated by mechano-pulse treatment, on the formation of tensile mechanical pro­perties of the 40Kh steel with surface nanostructure with and without electrolytic hydrogen charging was studied. Due to such treatment the yield strength of the obtained material was impro­ved in almost 2 times. However, the characteristics of plasticity changed am­big­uously: the elon­gation decreased in comparison with as-received state and the reduction in area after the multidirectional deformation – increased. The increment of the modulus of elasticity and formation of the equiaxed nanocrystalline structure, which enables transition of the severe plastic deformation to the advanced stage when plastic shear is suppressed and only plastic rotation occurs, is considered. It was established that after hydrogen charging, the multidi­rectional deformation generally provided the increase of the strength characteristics and retained the reduction in area as in the as-received steel.

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