Study on Microstructure and Fatigue Properties of A473M Stainless Steel Strengthened by Surface Rolling

The surface of A473M martensitic stainless steel shaft sleeve was treated with rolling technology. This paper studies the change of microstructure and the influence on surface properties caused by feed parameters of rolling processing. The experimental results show that the surface of A473M martensitic stainless steel shaft sleeve is rolled, and the residual stress of its hardened layer changes from tensile stress to compressive stress and gradually decreases from the surface to the inside, and the maximum residual compressive stress on the surface can reach − 946 MPa. The surface roughness is reduced from 383 to 62.7 nm, the microstructure is refined, the width of martensite lath is reduced, and the texture in //ND direction is formed. The maximum nano-hardness of the surface hardened layer is increased from 2.5 to 4.8 GPa, the maximum depth of the hardened layer is 160 μm, and the maximum elastic modulus is increased from 140 to 217 GPa. Compared with A473M martensitic stainless steel matrix, the tensile strength is improved by 40