Microstructure Characteristics of 30CrMnSiNi2A Steel After Ultrasound-Aided Deep Rolling

摘要

Effects of ultrasound-aided deep rolling (UADR) process on the microstructure of 30CrMnSiNi2A steel were studied using nanohardness tester, x-ray diffraction (XRD), scanning electron microscope (SEM), electron backscattered diffraction (EBSD), and transmission electron microscope (TEM). Results show that surface nanocrystallization, grain refinement, strain-induced martensite transformation, shear bands, intense shear texture {110} <111>, and rolling texture {112} <131> in the surface and subsurface were produced by the severe plastic deformation in the UADR process. Although deep compressive residual stress, work hardening, and grain refinement were generated in the treated surface and subsurface, the full width at half maximum (FWHM) value of the XRD peak in this zone decreased "abnormally", which means that the FWHM value may not characterize correctly the degree of work hardening and grain refinement in this situation.