Effect of austenite deformation and chemical composition on the microstructure and hardness of low-carbon and ultralow-carbon bainitic steels

Author: Suikkanen P.   Kömi J.   Karjalainen L.  

Publisher: Springer Publishing Company

ISSN: 0026-0673

Source: Metal Science and Heat Treatment, Vol.47, Iss.11-12, 2005-11, pp. : 507-511

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Abstract

The effect of hot deformation and chemical composition on the microstructure and hardness of experimental grades of low-carbon and ultralow-carbon C-Mn-Mo-Nb-B steels is studied by the method of physical simulation. It is shown that deformation of austenite at a temperature below that of recrystallization leads to formation of polygonal ferrite and high-temperature ferrite with bainitic morphology. The effect is the most pronounced in boron-bearing steels. Simultaneous alloying with Mo, Nb, and B seems to be the most effective for ensuring high hardness.

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