Transactions of Materials and Heat Treatment

Title：Experimental research on hot deformation behavior of ultra high strength steel and simulation analysis of the constitutive relationship

Authors： Li Guocheng Deng Tao Lu Renzhi

Unit： Chongqing Jiaotong University

KeyWords： boron steel hot deformation behavior stress-strain curves constitutive relationship

ClassificationCode：TG306

year,vol(issue):pagenumber：2016,41(3):110-115

Abstract：

For boron steel 22MnB5 to research the deformation behavior of ultra high strength steel at high temperature, some isothermal uniaxial tensile tests were carried out by thermo-mechanical simulator Gleeble 1500D at the temperature range of 600-900 ℃ with strain rates of 0.01，0.1 and 1 s-1 respectively, and the stress-strain curves under different conditions were obtained. Experiments show that the influences of temperature, strain rate and strain on the flow stress are of mutual relations. In consideration of the interaction of different factors, the constitutive model of boron steel 22MnB5 at high temperature was established by polynomial fitting, and the computational data agrees well with the experimental data. Furthermore, the above model can predict the relationship between the stress and strain under the different conditions.

Funds：

重庆市科委基础与前沿研究计划项目（CSTC2013 JCYJA0794）

李国城（1990-），男，硕士研究生通讯作者：邓涛(1982-),男，博士，副教授

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