摘要
Advanced automotive steels were designed with alloy concept and thermodynamics. Several phases were taken for the designing of transformation induced plasticity（TRIP） steels in accordance with the practical metallurgy process. A1 was firstly chosen to substitute Si for improving galvanizing property, afterwards P was proved to be another alternative of Si by thermodynamic calcula- tion and kinetic estimation. Thermodynamic investigation in the third phase revealed the effective function of A1 to increase carbon solubility in austenite as well as TRIP effect of steel. Stack fault energy was calculated, in combination with heat treatment and microstructure measurement, which led to a successful composition designing of twin induced plasticity （TWIP） steel.
Advanced automotive steels were designed with alloy concept and thermodynamics. Several phases were taken for the designing of transformation induced plasticity（TRIP） steels in accordance with the practical metallurgy process. A1 was firstly chosen to substitute Si for improving galvanizing property, afterwards P was proved to be another alternative of Si by thermodynamic calcula- tion and kinetic estimation. Thermodynamic investigation in the third phase revealed the effective function of A1 to increase carbon solubility in austenite as well as TRIP effect of steel. Stack fault energy was calculated, in combination with heat treatment and microstructure measurement, which led to a successful composition designing of twin induced plasticity （TWIP） steel.
基金
Acknowledgement This work is financially supported by the National Key Basic Research Development Project of China （Grant No. 2010CB630802）, the National Natural Science Foundation of China （Grant Nos.50934011 and 50971137） and Shanghai University.
