Effect of intercritical quenching on microstructure and properties of DP980 steel

The increase in the number of cars leads to an increase in energy consumption, so the trend of automotive lightweight is more and more obvious, and DP steel with its excellent strength and plastic fit, high-cost performance, and other advantages in a long time is still the main material with high strength and high performance for automobiles. The effect of quenching temperature and soaking time on the microstructure and properties of DP980 steel in the critical quenching and tempering process was studied. The results show that martensite structure occurs when the quenching temperature is 760°C, and the volume fraction of martensite is 32% when the quenching temperature is 780°C. At 720°C to 780°C, the product of strength and ductility of DP980 steel increases with the increase of quenching temperature. The focus of future work is to find the appropriate quenching temperature and the Soaking time, on the basis of reaching the strength requirements, to get the best comprehensive mechanical properties.