2009•Suxing gongcheng xuebaoRequires access
Constitutive characteristic of hot deformation for Cr15Mn9Cu2Ni1N austenitic stainless steel
Hou Guo-qing
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Abstract
Hot compression tests of Cr15Mn9Cu2Ni1N austenitic stainless steel were performed by using the thermal/mechanical testing machine.The flow stress-strain curves have been obtained in the deformation temperature range of 950℃ to 1200℃ and strain rate range of 0.01s-1 to 2.5s-1.By using the linear regression analysis method,the hot deformation constitutive equation based on hyperbolic sine form model was obtained for this steel,and hot deformation activation energy is 488.16kJ/mol in this constitutive equation.Due to higher content of Mn,the hot deformation activation energy of this steel is relatively higher than that of conventional Ni-Cr austenitic stainless steels.Microstructures of compression specimens after hot deformation were analyzed.Partial dynamic recrystallization occurs at 1000℃ and completely dynamic recrystallization microstructure can be obtained at temperature above 1100℃.