Influence of Heat Treatment and Deformation on the Phase-Structural State of Steel 30CrMnSiA

摘要

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 ccmcntite particles and special carbide M_6C. These particles are located mainly along the boundaries and junctions of the fragments.