JOURNAL ARTICLE

Effect of Austenitising Temperature on Mechanical Properties of Nanostructured Bainitic Steel

Jing Zhao, Jiemin Li, Honghong Ji, Tiansheng Wang
Materials 2017 July 28, 10 (8)
28773233
Nanostructured bainite was obtained in high-carbon Si-Al-rich steel by low-temperature (220-260 °C) isothermal transformation after austenitisation at different temperatures (900 °C, 1000 °C, and 1150 °C). Improved strength-ductility-toughness balance was achieved in the nanostructured bainitic steel austenitised at low temperatures (900 °C and 1000 °C). Increasing the austenitising temperature not only coarsened prior austenite grains and bainite packets, but also increased the size and fraction of blocky retained austenite. High austenitising temperature (1150 °C) remarkably decreased ductility and impact toughness, but had a small effect on strength and hardness.

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