Abstract
The segregation behavior of trace amount of phosphorus (P) and the mechanical properties of dual-phase (DP) steels have been systematically studied. The microstructure of DP steels is mainly composed of martensite, ferrite and nanoscale carbides. For the DP steels with different trace amounts of P (≤ 0.015 wt%), P has almost no effect on the mechanical properties. Atom probe technology (APT) analyses confirm that P segregation was only found at the precipitate/matrix interface. Moreover, the precipitates of (Ti, Mo) C are widely distributed in the ferrite, martensite and ferrite/martensite interface regions. The special segregation feature of P would not concentrate at specific regions such as ferrite/martensite interface and/or martensite lath interface, which reveals that trace amounts of P (≤ 0.015wt%) have almost no effect on the mechanical properties of DP steels. It is proved for the first time that the MC-type carbides of (Ti, Mo) C can reduce or eliminate the damage effect of P on the mechanical properties of steels, which provides a new way for the design of alloys to reduce P damage. This work will promote to increase the P content control standard in DP steels from 0.01 to 0.015 wt%, which will not change the mechanical properties, but greatly reduce the scrap rate and increase the energy efficiency of the manufacturing process.
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (Nos. 51871012, 52071021) and the Fundamental Research Funds for the Central Universities (No. FRF-GF-20-20B).
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Wang, J., Li, W., Zhu, X. et al. Characterization of the Trace Phosphorus Segregation and Mechanical Properties of Dual-Phase Steels. Acta Metall. Sin. (Engl. Lett.) 35, 341–352 (2022). https://doi.org/10.1007/s40195-021-01261-x
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DOI: https://doi.org/10.1007/s40195-021-01261-x