Tempering stability of retained austenite in nanostructured dual-phase steels

Hu, Feng; Wu, Kaiming; Hou, Tingping and Shirzadi, Amir A. (2013). Tempering stability of retained austenite in nanostructured dual-phase steels. Materials Science and Technology, 29(8) pp. 947–953.

DOI: https://doi.org/10.1179/1743284713Y.0000000227

Abstract

The tempering resistance and stability of retained austenite in super-bainitic and quenching-partitioning martensitic steels were investigated over the temperature range of 400 to 700 °C. The X-ray diffraction analysis and hardness tests showed that the quenching-partitioning-martensitic steel contained a considerable amount of retained austenite (26.6 vol%) and had a relatively high hardness up to 556 HV1 after tempering at about 600 °C. In contrast, the fraction of retained austenite and hardness of super-bainitic steel were considerably lower (24.5 vol% and 385 HV1) after the same tempering cycle. The work also showed that the quenching-partitioning steel had a higher tempering stability, probably, due to the higher fraction of carbon-rich retained austenite.

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