Grade 91 (9Cr-1Mo) steel was subjected to various heat treatments and then to high-pressure torsion (HPT) at different temperatures. Its microstructure was studied using transmission electron microscopy (TEM) and X-ray diffraction (XRD). Effects of the tempering temperature and the HPT temperature on the microstructural features and microhardness in the ultrafine-grained (UFG) Grade 91 steel were researched. The study of the UFG structure formation takes into account two different microstructures observed: before HPT in both samples containing martensite and in fully ferritic samples.
A. Ganeev et al., "Effects of the Tempering and High-Pressure Torsion Temperatures Onmicrostructure of Ferritic/Martensitic Steel Grade 91," Materials, vol. 11, no. 4, MDPI AG, Apr 2018.
The definitive version is available at https://doi.org/10.3390/ma11040627
Materials Science and Engineering
Keywords and Phrases
Ferritic/Martensitic Steel; High-Pressure Torsion; Ultrafine-Grained Structure
International Standard Serial Number (ISSN)
Article - Journal
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01 Apr 2018