Study On Recrystallization Of30CrMo Steel Based On CSP Process

Medium&high-carbon steel is applied wildly in varieties of industries, such asaviation, electronics, mechanics and automobile for its excellent mechanical properties.So far, China can produce medium&high-carbon steel mainly depending on traditionaltechnology and the product has some shortcomings, such as inhomogeneouscomposition, surface decarbonization, poor flatness etc. CSP process possesses a seriesof advantages like fast solidification, small composition segregation and high yield rateand it can notably improve shortcomings exist in traditional process. So it’s significantto explore medium&high-carbon steel technology based on CSP process.In this article,30CrMo steel produced by the CSP mill of WISCO is chosen asrepresentative to analyze its dynamic and static recrystallization rules by makingsingle-pass and double-pass thermal simulation experiments under different deformationconditions.And following conclusions are obtained:(1) Stress-strain curves of single-pass thermal simulation experiments aremeasured to calculate deformation activity energy of dynamic recrystallization, and thenZ parameter equation is built, flow stress-strain model of high temperature austeniticarea, grain size model and kinetic model of dynamic recrystallization are established;(2) Stress-strain curves of double-pass thermal simulation experiments aremeasured and used to calculate softening ratio by2%stress compensation method toinvestigate effects of different deformation conditions on static recrystallization;deformation activity energy of static recrystallization is calculated and finally thekinetic model of dynamic recrystallization is established.