Behavior of C45 steel Subjected to Different High Pressure Torsion (HPT) Procedures
Mike Haddad, Yulia Ivanisenko, Hans-Jörg Fecht

Abstract
Steel, as an indispensable material in modern engineering and structural applications, continues to be highly relevant in the field of nanocrystalline materials. Devising innovative methods in addition to understanding the deformation physics of those materials are of great importance in modern research fields to enhance the superior properties of such materials. In this study, commercially available C45 steel (Fe, 0.42-0.5w% C, 0.5-0.8w% Mn) was processed with different high pressure torsion procedures leading to ultrafine/nano-scale grain size and improved mechanical properties. This study summarizes the mechanical properties, deformation behavior, and microstructure development of nanocrystalline C45 steel through in-situ tensile test measurements performed within the scanning electron microscope and supplemented by transmission electron microscopy analysis. It also outlines the characteristics of the warm high pressure torsion technique (WHPT) which improved the mechanical properties of the commercial C45 steel significantly and made it comparable with high strength high alloyed steels.

Full Text: PDF