The effects of different warm rolling(WR)reductions on the microstructure and mechanical properties of low-Cr FeCrAl alloys at both room and elevated temperatures were investigated.The study revealed that when the WR ...The effects of different warm rolling(WR)reductions on the microstructure and mechanical properties of low-Cr FeCrAl alloys at both room and elevated temperatures were investigated.The study revealed that when the WR reduction is small,it effectively refines the grains and forms a large number of subgrains in the matrix,while also inducing the dissolution of the Laves phase.This enhances the mechanical properties of FeCrAl alloys primarily through grain refinement and solid solution strengthening.Conversely,with larger WR reductions,the grain refinement effect diminishes,but a significant number of Laves phases form in the matrix,strengthening the alloys primarily through precipitation strengthening.WR exhibited a remarkable enhancing effect on the comprehensive mechanical properties at both room and high temperatures,with a signi-ficant enhancement in ductility at high temperatures.Notably,a 10%WR reduction resulted in the optimal overall mechanical properties at both room and elevated temperatures.展开更多
In this study,specific warm rolling was carried out to process the Fe_(50)Mn_(30)Co_(10)Cr_(10) high-entropy alloy.The aim was to investigate the effect of warm rolling temperature on the microstructure and mechanical...In this study,specific warm rolling was carried out to process the Fe_(50)Mn_(30)Co_(10)Cr_(10) high-entropy alloy.The aim was to investigate the effect of warm rolling temperature on the microstructure and mechanical properties.The results indicated that serious transverse cracks appeared in the 25℃ rolled sheet with reduction of 60%,which was significantly improved through 100−300℃ warm rolling.In addition,the increase of rolling temperature promoted dislocation slip and inhibited martensitic transformation and twinning deformation.A single face centered cubic(FCC)matrix with abundant dislocations and stacking faults was developed in the 300℃rolled microstructure.Meanwhile,the deformation stored energy gradually increased,and the copper-type deformation texture was gradually enhanced.After annealing,the recrystallized microstructure of 25−200℃ rolled sheets was composed of FCC and a small amount of HCP phase.However,the hexagonal close packed(HCP)content in the annealed sheet rolled at 300℃ was as high as 20%−23% after annealing for 2−4 min and decreased to 4.5%after annealing for 8 min.All recrystallized microstructure contained a large number of annealing twins,and the average grain size increased with the increase of rolling temperature.Moreover,the mechanical properties of the annealed sheet were significantly improved after warm rolling.展开更多
文摘The effects of different warm rolling(WR)reductions on the microstructure and mechanical properties of low-Cr FeCrAl alloys at both room and elevated temperatures were investigated.The study revealed that when the WR reduction is small,it effectively refines the grains and forms a large number of subgrains in the matrix,while also inducing the dissolution of the Laves phase.This enhances the mechanical properties of FeCrAl alloys primarily through grain refinement and solid solution strengthening.Conversely,with larger WR reductions,the grain refinement effect diminishes,but a significant number of Laves phases form in the matrix,strengthening the alloys primarily through precipitation strengthening.WR exhibited a remarkable enhancing effect on the comprehensive mechanical properties at both room and high temperatures,with a signi-ficant enhancement in ductility at high temperatures.Notably,a 10%WR reduction resulted in the optimal overall mechanical properties at both room and elevated temperatures.
基金Project(2022RALKFKT003)supported by the Open Research Fund from the State Key Laboratory of Rolling and Automation of Northeastern University,ChinaProjects(20232BAB204053,20202ACBL214015)supported by the Natural Science Foundation of Jiangxi Province,China。
文摘In this study,specific warm rolling was carried out to process the Fe_(50)Mn_(30)Co_(10)Cr_(10) high-entropy alloy.The aim was to investigate the effect of warm rolling temperature on the microstructure and mechanical properties.The results indicated that serious transverse cracks appeared in the 25℃ rolled sheet with reduction of 60%,which was significantly improved through 100−300℃ warm rolling.In addition,the increase of rolling temperature promoted dislocation slip and inhibited martensitic transformation and twinning deformation.A single face centered cubic(FCC)matrix with abundant dislocations and stacking faults was developed in the 300℃rolled microstructure.Meanwhile,the deformation stored energy gradually increased,and the copper-type deformation texture was gradually enhanced.After annealing,the recrystallized microstructure of 25−200℃ rolled sheets was composed of FCC and a small amount of HCP phase.However,the hexagonal close packed(HCP)content in the annealed sheet rolled at 300℃ was as high as 20%−23% after annealing for 2−4 min and decreased to 4.5%after annealing for 8 min.All recrystallized microstructure contained a large number of annealing twins,and the average grain size increased with the increase of rolling temperature.Moreover,the mechanical properties of the annealed sheet were significantly improved after warm rolling.
