Study Of GCR15Bearing Steel Recrystallization Behaviors In Hot Ring Rolling Process

The metal theory shows that the mechanical properties of metal depends on themicrostructure of materials, thermal deformation recrystallization behaviors have asignificant impact on the microstructure. Therefore, accurate descriptions of therecrystallization behaviors can predict the microstructure of products under specificprocess, provide the basis for further guidance and achieve the purpose to improveproduction practices.In this paper, high-performance bearing ring controllable microstructurefabrication and GCr15bearing steel hot ring rolling process were studied, analyzedby elastic-plastic mechanics, kinematics analysis and deformable body shaping andforming processes physical simulation experiment combined thermodynamicprinciples and materials theory, GCr15recrystallization behaviors under hot ringrolling process were studied: thermal simulation isothermal compression experimentswere conducted, macro and micro constitutive equations GCr15bearing steel thermaldeformation state were proposed; based on experimental studies, theoretical analysisand Simufact software platform macroscopic plastic deformation and recrystallizationbehaviors coupled numerical model of GCr15were built to calculate the GCr15bearing steel hot ring rolling process macroscopic stress-strain field andmicrostructure state distribution after recrystallization, revealed the effects of GCr15recrystallization behaviors on the microstructure of the material; provide a reliabletheoretical basis and design methods for the manufacture of high-performancebearings controllable ring.Research were based on classic recrystallization model, one of the mostcommonly used bearing steel GCr15during hot deformation behavior was studied byusing Gleeble-3500thermal-mechanical simulation system, austenite grain growexperiment, single pass compression test, two-pass compression test and single-passcompression-insulation test were launched, respectively. Based on the experimental data, a series of mathematical equations have been solved, which made us able toaccurately describe the behaviors of GCr15, laid a good foundation for the subsequentfinite element simulation.GCr15recrystallization equations obtained from experiments embedded inSimufact Material Data, compared with the material100Cr6steel that chemicalcomposition close to GCr15bearing steel in the same simulation process, the resultsshow that the model embedded in can successfully describe simple thermaldeformation process, but still have some problems in complex radial thermal ringrolling process simulation, illustrate this research idea is feasible, but need for furtheroptimization and exploration.