Hot deformation behavior and hot working diagram of 23MnNiMoCr54 alloy steel for chain ring
The single pass hot compression experiment was carried out on Gleeble-3500 testing machine to analyze the influence of deform-ation temperature and strain rate on the hot deformation behavior and microstructure evolution laws of 23MnNiMoCr54 alloy steel.The strain-dependent thermal deformation constitutive equation was established.On this basis,the thermal processing map was drawn to deter-mine the best processing range.The results indicate that the hot deformation behavior of 23MnNiMoCr54 alloy steel has unimodal"dynam-ic recrystallization"characteristics.The flow stress of 23MnNiMoCr54 alloy steel decreases with the increasing of deformation temperature and the decreasing of strain rate during hot compression.The dynamic recrystallized grains and deformed grains grow at higher deformation temperatures or lower strain rates.The established thermal working diagram shows that the larger rheological instability exists at lower de-formation temperature and higher strain rate,and the rheological instability phenomenon is easily to occur.The optimal process parameters of 23MnNiMoCr54 alloy steel in hot processing are the deformation temperature of 1150-1250℃and the stain rate of 0.01-0.1 s-1.
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