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The dynamic tensile behavior of HSLA TRIP steel and its modeling

Li Liu

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Abstract

The dynamic tensile behavior of HSLA TRIP steel at room temperature was investigated in the strain rate from 900 s-1 to 1600 s-1. The results showed that the yield strength and uniform tensile strength increase and total elongation decreases with increasing strain rate. The dynamic deformation mechanism is the combined effects of strain rate hardening, adiabatic temperature rise and deformation-induced transformation of the retained austenite. The flow stress simulated by considering quasi-static, thermally activated and viscous drag flow characteristics as well as strain rate softening effect under high strain rate is in good agreement with the test date. The rate of plastic work translating into heat under high rate deformation is 0.8-0.9 for the HSLA TRIP steel.

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What this paper is about

The dynamic tensile behavior of HSLA TRIP steel at room temperature was investigated in the strain rate from 900 s-1 to 1600 s-1. The results showed that the yield strength and uniform tensile strength increase and total elongation decreases with increasing strain rate. The dynamic deformation mechanism is the combined effects of strain rate hardening, adiabatic temperature rise and deformation-induced transformation of the retained austenite. The flow stress simulated by considering quasi-static, thermally activated and viscous drag flow characteristics as well as strain rate softening effect under high strain rate is in good agreement with the test date. The rate of plastic work translating into heat under high rate deformation is 0.8-0.9 for the HSLA TRIP steel.

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Available abstract

The dynamic tensile behavior of HSLA TRIP steel at room temperature was investigated in the strain rate from 900 s-1 to 1600 s-1. The results showed that the yield strength and uniform tensile strength increase and total elongation decreases with increasing strain rate. The dynamic deformation mechanism is the combined effects of strain rate hardening, adiabatic temperature rise and deformation-induced transformation of the retained austenite. The flow stress simulated by considering quasi-static, thermally activated and viscous drag flow characteristics as well as strain rate softening effect under high strain rate is in good agreement with the test date. The rate of plastic work translating into heat under high rate deformation is 0.8-0.9 for the HSLA TRIP steel.

Key concepts: Materials science, Strain rate, Ultimate tensile strength, Flow stress, Work hardening, Softening, Elongation, Austenite

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