Effects of Novel Q-P-T and Traditional Q-T Processes on the Microstructure and Mechanical Properties of Martensitic Steels With Different Carbon Content

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Compared with traditional quenching and tempering (Q-T) treatment, the product of strength and elongation of the carbon steel can be enhanced significantly by novel quenching- partitioning-tempering (Q-P-T) treatment, especially for the medium carbon steel. Based on the tensile results, the product of strength and elongation of the Fe-0.42C-1.46Mn-1.58Si-0.028Nb specimen treated by Q-P-T, is up to 31627 MPa·% with elongation 20.3%, which not only is higher than the specimen treated by Q-T process, but also meets the mechanical properties predicted of next generation advanced high strength steel. Microstructural analysis indicates the differences in Q-T and