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Microstructural evidence of nano-carbides in medium carbon high silicon multiphase steels

IR@NML: CSIR-National Metallurgical Laboratory, Jamshedpur


Field	Value

Title	Microstructural evidence of nano-carbides in medium carbon high silicon multiphase steels

Creator	Varshney, A Sangal, S Gouthama, Pramanick, A K Mondal, K

Subject	Materials Charcterization

Description	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.

Publisher	Elsevier

Date	2017

Type	Article PeerReviewed

Format	application/pdf

Identifier	http://eprints.nmlindia.org/7736/1/Varshney%2C_A.pdf 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.

Relation	https://www.sciencedirect.com/science/article/pii/S0921509317312571 http://eprints.nmlindia.org/7736/