Abstract
The commercial steel was processed by three different Q&P heat treatments and three kinds of steels with different microstructures and mechanical properties were obtained. Among them, two steel samples contain bainite and ferrite matrix, fresh martensite and retained austenite, while the other possesses tempered martensite and ferrite matrix, fresh martensite and retained austenite. Comparing the content of retained austenite in these samples, the highest volume fraction was obtained in the sample with bainite matrix and a higher partitioning temperature. The mechanical property result shows that the yield strength for three steel samples had little difference, but their elongations were quite different. The steel with most retained austenite exhibits a good combination of yield strength and ductility.
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