Varshney, A and Sangal, S and Gouthama, and Pramanick, A K and Mondal, K (2017) Microstructural evidence of nano-carbides in medium carbon high silicon multiphase steels. Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing , 708 (IF-3.094). pp. 237-247.
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High silicon steels containing 1.5-2 wt% silicon are considered to form carbide free bainite. However, the present work shows experimental evidence for the formation of nano-carbides in a series of medium carbon (0.61 wt%) high silicon (1.71 wt%) low alloy mixed phase steels with the help of transmission electron microscopy. The nano-carbide formation in bainite is attributed to the formation of inter-critical ferrite during continuous cooling, resulting in partitioning of carbon and silicon at the austenite-ferrite interface, leading to an increase in carbon and decrease in silicon at the austenite side of the interface. Due to diffusionless growth of supersaturated bainitic ferrite lath under pars-equilibrium conditions, formation of bainite proceeds with higher carbon and lower silicon, allowing carbide formation in the bainite during subsequent holding at bainitic transformation temperature. Nano-carbides along with mixed phase microstructures are attributed to the excellent combination of high strength and high ductility in the present steels.
|Uncontrolled Keywords:||Mixed phase steel; Bainite; Carbides; Heat treatment; TEM|
|Divisions:||Material Science and Technology|
|Deposited By:||Sahu A K|
|Deposited On:||01 Feb 2018 13:14|
|Last Modified:||01 Feb 2018 15:30|
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