Study on High-Temperature Mechanical Properties of 28MnCr5 Gear Steel

摘要

28MnCr5 is a kind of level gear Steel. The forming of surface cracks of steel caster is closely related with the high temperature mechanical, which decide the critical deformation value of the solidified shell. In current paper, Gleeble-1500 stress/strain thermal simulation machine was used to investigate the relationship between the hot ductility, tensile strength, yield phenomena and temperature. The results show that III brittle temperature zone ranges from 900 to 600℃. The reason of forming brittleness lowest point of 28MnCr gear steel is the grain boundary sliding phenomenon. Straightening temperature should be higher than the lower limit of III brittle temperature range, and weak secondary cooling should be used to improve the straightening temperature during the continuous casting process.