Thermal deformation behavior and hot processing map of Fe-28Mn-10Al-1C-3Cu lightweight steel
Under the"dual carbon"strategy objective,reducing vehicle weight to achieve a reduction in vehicle ex-haust emissions will help achieve this goal as soon as possible.Therefore,researchers focus research on the develop-ment of high-strength low-density automotive steel.Although high-strength Fe-Mn-Al-C austenitic lightweight steel has received much attention in the automotive industry due to its excellent comprehensive properties and significant weight reduction effect,and has a wide open future development opportunity,its yield strength and hydrogen embri-ttlement fracture resistance still need to be further improved.The above-mentioned problems can be improved by adding Cu element in Fe-Mn-Al-C austenitic lightweight steel.In order to study the high-temperature deformation behavior of Fe-Mn-Al-C-Cu austenitic lightweight steel,unidirectional hot compression tests on forged Fe-28Mn-10Al-1C-3Cu austenitic lightweight steel were taken by Gleeble-3500 thermal simulation testing machine.The strain rate was 0.01-10 s-1,the deformation temperature was 850-1 100 ℃,and the strain was 0.6.The rheological be-havior of Fe-28Mn-10Al-1C-3Cu austenitic lightweight steel was obtained.The results show that the stress decrea-ses with the increase of deformation temperature at the same strain rate.The stress increases with the increase of strain rate at the same deformation temperature.Combined the obtained true stress-strain curve with the Arrhenius and Zener-Holomon equation,the thermal deformation constitutive equation of Fe-28Mn-10Al-1C-3Cu austenitic lightweight steel was constructed.Based on the dynamic material model and Prasad instability criterion,the energy dissipation map and rheological instability map of lightweight steel were calculated,and the hot processing map was plotted.The suitable hot deformation process region for the steel was determined.Region Ⅰ is strain rate 0.01-0.08 s-1 and deformation temperature 975-1 025 ℃,and region Ⅱ is strain rate 0.01-0.76 s-1 and deformation temperature is 1 050-1 100 ℃.The research results can provide theoretical guidance for the hot processing of Cu containing auste-nitic lightweight steel.
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