Austenite Grain Structures in Ti and Nb-Containing HSLA Steel during Slab Reheating

Debalay Chakrabarti; S. Roy; Dinesh Srivastava; Gautam Kumar Dey

doi:10.4028/www.scientific.net/MSF.783-786.669

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HomeMaterials Science ForumMaterials Science Forum Vols. 783-786Austenite Grain Structures in Ti and Nb-Containing...

Austenite Grain Structures in Ti and Nb-Containing HSLA Steel during Slab Reheating

Abstract:

Spatial distribution of microalloy precipitates have been characterized in a low carbon microalloyed steel containing Nb, Ti and V. Micro-segregation during casting resulted in an inhomogeneous distribution of Nb (and also Ti) precipitates in the as-cast slab. Austenite grain growth has been investigated in the above mentioned steel, using different reheating temperatures between 1000°C and 1250°C for 1 h. Inhomogeneous distribution of Nb-rich precipitates created austenite grain size bimodality after reheating to an intermediate temperature range (1150-1200°C). Uniformly fine and uniformly coarse grain structures were found after reheating at lower- (≤ 1075°C) and higher-reheating temperatures (≥ 1250°C). A model has been proposed for the prediction of austenite grain size variation in the reheated steel.

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Periodical:

Materials Science Forum (Volumes 783-786)

Pages:

669-673

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.783-786.669

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Online since:

May 2014

Authors:

Debalay Chakrabarti*, S. Roy, Dinesh Srivastava, Gautam Kumar Dey

Keywords:

Austenite Grain Growth, Grain Size Distribution, Inhomogeneous Precipitate-Distribution, Micro-Segregation, Pinning, Precipitation, Slab Reheating

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