Open AccessEffect of Rolling Processing on Mechanical Properties of Material Cr12
Author(s) -
Yichen Liu,
Taoyuan Li,
Haiquan Zhang,
Pengran Guo
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/735/1/012025
Subject(s) - materials science , residual stress , indentation hardness , ultimate tensile strength , surface roughness , microstructure , surface stress , compressive strength , stress (linguistics) , surface finish , composite material , metallurgy , hardness , surface energy , linguistics , philosophy
The rolling process changes the mechanical properties of the specimen’s surface material, and it also directly affect the fatigue strength and service life of the workpiece. The effects of rolling parameters on surface residual stress, microhardness, surface roughness and surface microstructure are studied by rolling test of Cr12 specimens. After rolling, the residual stress on the surface of Cr12 specimens changes from tensile stress to compressive stress, and the maximum compressive stress is -216MPa. With the increase of contact stress and rolling passes, the residual compressive stress increases at first and then remains stable. Rolling processing can effectively improve the surface hardness of specimens up to 30%, and the surface roughness can be reduced by 25%-67%. The fine grains aligned with the rolling direction, and the 50-60 μm grain refinement layers were observed, which resulted in the changes in the surface mechanical properties of the specimens.