Abstract
There exists obvious deficiency in traditional twining induced plasticity (TWIP) steel which exhibits excessive ductility but rather low strength. In order to improve the property, new composition of a test steel, i.e., Fe-18Mn-0.528Si-0.6C (mass fraction, %) steel is designed through increasing C content and decreasing Mn content upon the estimation result of stack fault energy and phase diagram calculation. That the γ →e transformation may happen during deformation at room temperature in the designed steel is predicted through calculation. The microstructure, before and after tensile test, of the hot rolling test steel is analyzed with OM, XRD and TEM. It is shown that there occurs simultaneously TWIP and transformation induced plasticity (TRIP) effect in the steel treated by a special hot rolling process (rolling starting temperature 1100 , finishing rolling temperature 850 and air cooling) and superior mechanical property with strength higher than 1 GPa and elongation rate higher than 60% are then obtained which fit very well with the requirement of the third generation automobile steel. It is also revealed the existence of e martensite obtained through quenching or induced by stress would damage the mechanical property.
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