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Effect of austenitic state on microstructure and mechanical properties of martensite/bainite steel

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Abstract

Various heat treatments and thermal simulation with different austenitizing temperatures and austenite deformation were applied on a bearing steel to obtain various austenitic state. The effect of austenitic state on microstructure of martensite/bainite (M/B) dual phase steel and its mechanical property has been investigated via microstructure observation and kinetic analysis. The results show that the M/B steels austenitized at 900 and 950 °C have better comprehensive performance compared with the steels austenitized at 850 and 1050 °C. The refined microstructure can be obtained after deformation, and the heavy deformation and low deformation temperature are useful for refining the microstructure. The bainite lath is longer and has well-directional arrangement at high austenitizing temperature with the same deformation. Furthermore, austenite deformation can improve the nucleation ratio, reduce incubation process, and affect the kinetics of bainite transformation significantly.

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ACKNOWLEDGMENTS

The authors wish to thank Laiwu Iron and Steel Group Co., Ltd., for supplying the steels used in test. This work was also financially supported by Science and Technology Development Planning Program of Shandong Province (2011GGX10202), College Independent Innovation Program of Ji’nan (201102048 and 201202073).

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  1. School of Materials Science and Engineering, Shandong University, Ji’nan, 250061, China

    Lei Tian, Qing Ao & Shengli Li

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  1. Lei Tian
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  2. Qing Ao
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  3. Shengli Li
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Correspondence to Shengli Li.

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Tian, L., Ao, Q. & Li, S. Effect of austenitic state on microstructure and mechanical properties of martensite/bainite steel. Journal of Materials Research 29, 887–895 (2014). https://doi.org/10.1557/jmr.2014.55

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