Evolution of microstructure in an ultra-low carbon Cu bearing HSLA forging

Das, Samar K and Ghosh, Arindam and Chatterjee, S and Ramachandrarao, P (2002) Evolution of microstructure in an ultra-low carbon Cu bearing HSLA forging. Scandinavian Journal Of Metallurgy, 31 (4). pp. 272-280.

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Over the last decade low carbon age hardenable steels have become a subject of interest for naval applications. In the present study an ultra-low carbon Ni-bearing steel alloyed with Cu was cast and processed by controlled forging and subsequently cooled in air, sand and water. A variety of multiphase structures have been observed because of different cooling rates. The slowest cooling rate has produced bainitic ferrite by ledge mechanism whereas lath- or plate-type bainitic ferrite was predominant at the faster cooling rates. The volume fraction of retained austenite and/or martensite austenite constituents increased with decreasing cooling rate. Precipitation of finer micro-alloying carbides and carbonitrides was suppressed by faster cooling. Slow cooling rates also resulted in the formation of epsilon-Cu precipitates of varying sizes and shapes.

Item Type:Article
Official URL/DOI:DOI: 10.1034/j.1600-0692.2002.10597.x
Uncontrolled Keywords:bainitic ferrite; Cu precipitates; MA constituents; Moire fringes; polygonal ferrite; retained austenite; strain-induced precipitation
Divisions:Material Science and Technology
ID Code:3574
Deposited On:25 Jul 2011 18:16
Last Modified:21 Nov 2012 13:36
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