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HomeMaterials Science ForumMaterials Science Forum Vols. 706-709Influence of Nb Microaddition on a Microstructure...

Influence of Nb Microaddition on a Microstructure of Low-Alloyed Steels with Increased Manganese Content

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Abstract:

The present study is a first step of a project to obtain thermo-mechanically processed fine-grained increased Mn content TRIP steels with large fractions of retained austenite. Two 0.17C-3Mn-1.6Al-0.2Si-0.2Mo steels with and without Nb microaddition were produced in a vacuum induction furnace. The influence of Nb microaddition on a macrostructure, a grain size and hot-working behavior were examined. The steels are characterized by a slight macrosegregation of Al in the as-cast state, minimized for a Nb-microalloyed steel. After hot forging refined bainitic-martensitic structures with large fractions of γ phase obtained. The steel microalloyed with Nb has finer granules of retained austenite at comparable fractions of this phase. The force-energetic parameters of hot-working were determined in an uniaxial hot-compression test at temperatures of 1150 and 950°C and strain rates from 0.1 to 10s^-1. The Gleeble 3800 thermomechanical simulator was used. The hot-working behaviour of the investigated steels is challenging because of higher flow stresses and ε_max strains compared to conventional TRIP steels with lower Mn contents.

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THERMEC 2011

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Periodical:

Materials Science Forum (Volumes 706-709)

Pages:

2124-2129

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.706-709.2124

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Online since:

January 2012

Authors:

Adam Grajcar, Sabina Lesz

Keywords:

Flow Stress, Hot-Compression Test, Macrosegregation, Manganese Steel, Nb Microalloying, Primary Structure, Retained Austenite, TRIP Steel

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