Effect of austempering time on microstructure and properties of a low-carbon bainite steel

Man Liu; Guang Xu; Jun-yu Tian; Qing Yuan; Xin Chen

doi:10.1007/s12613-019-1881-y

Volume 27 Issue 3

Mar. 2020

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2020 > 27(3): 340-346

Man Liu, Guang Xu, Jun-yu Tian, Qing Yuan, and Xin Chen, Effect of austempering time on microstructure and properties of a low-carbon bainite steel, Int. J. Miner. Metall. Mater., 27(2020), No. 3, pp. 340-346. https://doi.org/10.1007/s12613-019-1881-y

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Man Liu, Guang Xu, Jun-yu Tian, Qing Yuan, and Xin Chen, Effect of austempering time on microstructure and properties of a low-carbon bainite steel, Int. J. Miner. Metall. Mater., 27(2020), No. 3, pp. 340-346. https://doi.org/10.1007/s12613-019-1881-y

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Research Article

Effect of austempering time on microstructure and properties of a low-carbon bainite steel

+ Author Affiliations

Corresponding author:
Guang Xu E-mail: xuguang@wust.edu.cn
Received: 19 May 2019; Revised: 3 July 2019; Accepted: 8 July 2019; Available online: 12 December 2019

Abstract

Abstract

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 B_RF = 1− exp(−0.0499 × t^0.7616) 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.
- austempering time;
- retained austenite;
- martensite/austenite island;
- low-carbon bainite;
- transformation kinetics

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References

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