Flow Stress of TRIP Steel at Different Temperatures and Strain Rates

Abstract:

Uniaxial tension tests of transformation induced plasticity(TRIP780) steel at temperatures 298,333,363 K and strain rates 10-4,10-2, 100, 102, 103 s-1 were performed. The sensitivity of the flow stress of TRIP780 steel to temperature and strain rate was analyzed. In addition, the suitability of Johnson Cook(JC) and Khan Huang Liang(KHL) flow stress models to TRIP780 steel was discussed. The results indicate that the flow stress of TRIP780 steel shows positive sensitivity to the strain rate and negative sensitivity to the temperature, and the sensitivity of the flow stress of TRIP780 steel to strain rate decreases at high strain rate. At small strain, the JC model is more accurate for TRIP780 steel than KHL model in the flow stress prediction, while KHL model has higher precision at large strain.

Key words:transformation induced plasticity steel; flow stress; temperature; strain rate