Transactions of Materials and Heat Treatment

Title：High temperature rheological behavior and constitutive equation of as-cast heat-resisting alloy steel P91

Authors： Deng Kui Li Yongtang Fu Jianhua Liu Qiang

Unit： Taiyuan University of Science and Technology

KeyWords： as-cast heat-resisting alloy steel P91 thermal deformation flow stress constitutive equation

ClassificationCode：TG142.73；TG376

year,vol(issue):pagenumber：2015,40(11):100-106

Abstract：

To study the high-temperature deformation rheological behavior of the as-cast heat-resisting alloy steel P91, its high-temperature rheological stress constitutive equation was established and its isothermal compression experiment was done by the Gleeble-3500 thermal simulation testing machine. Then, the heat deflection behavior was investigated under the condition of the deflection temperature 900-1200 ℃, the strain rate 0.01-5 s-1, and deformation 60%. Results show that with the increase of the deformation temperature and the decrease of the stress rate, the possibility of dynamic recrystallization increases and the flow stress decreases substantially. And the curves transform from work hardening to dynamic recovery and dynamic recrystallization. Based on the sine-hyperbolic Arrhenius equation and the Zener-Hollomon parameters, the impact of true strain on flow stress was considered. The flow stress model and constitutive equation of the as-cast state heat resistant alloy steel P91 were proposed. Error analysis demonstrates that the proposed constitutive equation has a good accuracy.

Funds：

国家自然科学基金资助项目（51135007）

邓馗（1989-），男，硕士研究生

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