Abstract
Investigated the fragmented substructure of steel 30CrMnSiA after heat treatment and deformation. Found that after heat treatment of steel is the main component of α-phase (~ 96%), γ- phase (~ 3%) is present in the material in the form of residual austenite. Batch martensite is 0.7 on the volume of α- phase plate - 0.3. Most of the residual martensite (1.5%) is located in the plate martensite, the lowest - in a fragmented packet martensite component (~ 0.5%). In unfragmented batch martensite of residual austenite is present in an amount of 1%. Found that in the process of deformation martensite structure formed after heat treatment is completely destroyed and the volume fraction of anisotropic fragments is 25%, 75%-isotropic. Electron microscopic studies have shown that originated fragmented structure is stabilized by tertiary carbides formed during deformation. These carbides are cementite particles and special carbide M6C. These particles are located mainly along the boundaries and junctions of the fragments.