Application of Austempering Hardness Change Rule in Continuous Tempering Condition
A austempering mathematical model of the change rule of the tempering hardness for 30CrMnSiA steel was established based on the nonlinear regression analysis.Using the three dimensional graph described by this model,the destinguish between the austempering and the continuous tempering was analyzed.Theory analysing shows that the continuous tempering course can be see as a superposition of multiple austempering courses.The tempering hardness of quenched steel under continuous tempering can be determined by austempering model so long as the changing curve of temperature for the continuous tempering course is given.The austempering mathematical model can be conveniently used to forecast hardness change of quenched steel at continuous tempering condition,or the austempering model can be used to control tempering course in the real production process on the basis of different hardness requirements.