Dynamic recrystallization kinetics model analysis of 40CrNi2MoE steel extrusion process
In order to clarify the dynamic recrystallization state and high-temperature rheological characteristics of 40CrNi2MoE steel under the extrusion process,the high-temperature extrusion treatment of the material was studied and the strain and crystallization state were observed by benchtop field emission electron microscope and electro-hydraulic servo-dynamic fatigue testing machine.On the basis of obtaining the stress-strain curve of 40CrNi2MoE steel,the thermal deformation equation of the material is established based on the Arrhenius function,and it is found that the activation energy Q of thermal deformation is 343.887 kJ/mol,and the complete dynamic recrystallization can be achieved when the strain rate is between 0.1～10 s-1 and the temperature reaches more than 1 000 ℃.The relationship between the peak strain εp and its Z parameter of 40CrNi2MoE steel is εp=0.028 ln Z-0.35,and it is difficult for the material to undergo dynamic recrystallization under the condition of large Z parameters.The above data have certain reference significance for the micrograin refinement of 40CrNi2MoE steel in the processing process.
40CrNi2MoE steelhigh temperature rheological curvefine grain structuredeformation equation
万方数据
维普
