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Journal Reference
Metallurgical and Materials Transactions A, December 2015, Volume 46, Issue 12, pp 5561-5571.
Thomas Dorin , Nicole Stanford, Adam Taylor, Peter Hodgson
Deakin University, Pigdons Road, Geelong, VIC, 3216, Australia
Abstract
The phase transformation and precipitation in a high-strength low-alloy steel have been studied over a large range of cooling rates, and a continuous cooling transformation (CCT) diagram has been produced. These experiments are unique because the measurements were made from samples cooled directly from the melt, rather than in homogenized and re-heated billets. The purpose of this experimental design was to examine conditions pertinent to direct strip casting. At the highest cooling rates which simulate strip casting, the microstructure was fully bainitic with small regions of pearlite. At lower cooling rates, the fraction of polygonal ferrite increased and the pearlite regions became larger. The CCT diagram and the microstructural analysis showed that the precipitation of NbC is suppressed at high cooling rates, and is likely to be incomplete at intermediate cooling rates
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