Effect of austempering time on microstructure and properties of a low-carbon bainite steel
来源期刊：International Journal of Minerals Metallurgy and Materials2020年第3期
论文作者：Man Liu Guang Xu Jun-yu Tian Qing Yuan Xin Chen
文章页码：340 - 346
摘 要：The effect of austempering time after the bainitic transformation on the microstructure and property in a low-carbon bainite steel was investigated by metallography and dilatometry. The results showed that by prolonging the austempering time after the bainite transformation, the amount of large-size martensite/austenite islands decreased, but no significant change of the amount and morphology of bainite were observed. In addition, more austenite with a high carbon content was retained by prolonging the holding time at the bainite transformation temperature.Moreover, with a longer holding time, the elongation was improved at the expense of a small decrease in tensile strength. Finally, the Avrami equation BRF = 1-exp(-0.0499 × t0.7616) for bainite reaction at 350°C was obtained for the tested steel. The work provided a reference for tailoring the properties of low-carbon steels.
Man Liu，Guang Xu，Jun-yu Tian，Qing Yuan，Xin Chen
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology
摘 要：The effect of austempering time after the bainitic transformation on the microstructure and property in a low-carbon bainite steel was investigated by metallography and dilatometry. The results showed that by prolonging the austempering time after the bainite transformation, the amount of large-size martensite/austenite islands decreased, but no significant change of the amount and morphology of bainite were observed. In addition, more austenite with a high carbon content was retained by prolonging the holding time at the bainite transformation temperature.Moreover, with a longer holding time, the elongation was improved at the expense of a small decrease in tensile strength. Finally, the Avrami equation BRF = 1-exp(-0.0499 × t0.7616) for bainite reaction at 350°C was obtained for the tested steel. The work provided a reference for tailoring the properties of low-carbon steels.
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