Effect of Austenitising Temperature on Mechanical Properties of Nanostructured Bainitic Steel
1
State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China
2
National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University, Qinhuangdao 066004, China
*
Author to whom correspondence should be addressed.
Materials 2017, 10(8), 874; https://doi.org/10.3390/ma10080874
Received: 6 July 2017 / Revised: 24 July 2017 / Accepted: 26 July 2017 / Published: 28 July 2017
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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MDPI and ACS Style
Zhao, J.; Li, J.; Ji, H.; Wang, T. Effect of Austenitising Temperature on Mechanical Properties of Nanostructured Bainitic Steel. Materials 2017, 10, 874.
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