Suppression of grain growth in dual phase steels

Author： Park J.-H.   Tomota Y.   Wey M.-Y.  

Publisher： Maney Publishing

ISSN： 1743-2847

Source： Materials Science and Technology, Vol.18, Iss.12, 2002-12, pp. : 1517-1523

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Abstract

The growth behaviour of ferrite (α) and austenite (γ) grains at 1173, 1273, and 1373 K in an α + γ region was observed in a 3Si- 0.3Cr - 0.1C (wt-%) steel with a ferrite volume fraction of ~50%. The results are well summarised by the equation (r)3 - (r0)3 = kt, where r, r0, k, and t are the mean grain radius, the initial grain radius, a constant, and the annealing time, respectively. When a microalloying element Sm, P, B, Al, or Ti was added singly to the dual phase steel, grain growth was clearly retarded. Therefore, it is concluded that ultra refinement of grains can be achieved by using a combination of the dual phase effect and the pinning or dragging effect.

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