Relationship between mechanical properties in 42SiCr and 42SiMn medium-carbon steels and austempering temperatures

In conventional steels, bainitic microstructure which forms under isothermal conditions consists of ferrite and carbide precipitates whose distribution size substantially depend on the pa-rameters treatment. CFB steels (Carbide Free Bainite) however, main micro-structural constituents are ferrite, retained austenite and, sometimes, M-A constituent. may possess better ductility same or even higher strength than micro-structures precipitates. This advantage results from principle formation is related to absence brittle carbides their substi-tution with austenite. paper explores effect austempering mechanical proper-ties unconventional 42SiCr 42SiMn.