Research On Hot Deformation Behaviors Of High Carbon Alloy Steel 75Cr1

With the rapid development such as construction, mining and some other fields in China, the domestic demand for saw steel is increasing greatly, especially in the field of precision cutting equipment. Needed to import for a long time. The earliest researched steel 50Mn2 V has been difficult to satisfacte the need of the further development in domestic market.Research a new、superior performance saw steel has been a urgently need for many enterprises.High carbon alloy steel 75Cr1 possess higher hardness、elasticity and excellent abrasion resistance and more hardenability, It will become a new representative in saw steel field.The article uses Gleeble-1500 D thermal simulation testing machine executive a single pass on the steel, with the application of SEM, microscope and other equipment to study the effects on deformation resistance, the results show that: the lower the deformation temperature is, the greater the strain rate is, The stress-strain curve of 75Cr1 steel is more likely to show a dynamic recrystallization type; on the contrary, is more likely to show a type of work hardening.Research the 75Cr1 steel austenite grain growth behavior using a thermal heating experiment, the experimental results shows: the growth rate of grain increasing first and the gently in the end with temperature increased, combined with the grain growth model proposed by Sellars to calculate grain growth activation energy Q = 1.57 × 106 J / mol, further deduced grow grain model of 75Cr1 steelAccording to the hyperbolic sine function proposed by Tegart and appling linear regression method, in order to deduced the thermal deformation activation energy Q= 264.4KJ / mol,d calculated the thermal deformation equation of 75Cr1 steel:E=9.43*10^-3[sinh（010105σ）]^3.24exp（264.4/RT）of recrystallized volu Based on the evolution of energy storage, by fitting the existing experimental data, accurate positioning the response / dynamic recrystallization point on the critical stress-strain curve. And based on the evolution to creat a new idea of calculating the dynamic recrystallization fraction X of 75Cr1 D steel. This concept can resolve the difficult of no obvious peak stress-strain curve about the caculation me fraction, but its practical application is still need to discusse.The relevant establishmentT g physical metallurgy models in the microstructure nd property prediction software of the 75Cr1 steel on austenite grain growth model, the thermal deformation model 、dynamic recrystallization and flow stress model can be further applied to be underlyin a...