Effect of cooling rate on structure and properties of an ultra-low carbon HSLA-100 grade steel

Ghosh, Arindam and Das, S and Chatterjee, S and Ramachandrarao, P (2006) Effect of cooling rate on structure and properties of an ultra-low carbon HSLA-100 grade steel. Materials Characterization, 56 (1). pp. 59-65.

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An ultra-low carbon HSLA-100 grade steel was subjected to two stage forging operation followed by different post-cooling techniques. Higher strength value obtained at a faster cooling rate of 35 °C/s is due to highly dislocated acicular ferrite structure along with fine precipitation of microalloying carbides and/or carbonitrides. At a slower cooling rate of 1.15 °C/s the strength value drops with an increase in ductility due to larger volume fraction of less dislocated polygonal ferrite structure. The strength value remained almost unchanged with a further decrease in cooling rate to 0.68 °C/s due to the formation of predominantly polygonal ferrite microstructure. At slower post-cooling rates high impact toughness value obtained at ambient and at − 40 °C testing temperature is due to fine grained polygonal ferrite microstructure. At all post-cooling conditions the change in impact toughness value at ambient and at − 40 °C temperature was found to be negligible due to the ultra-low carbon content of the steel.

Item Type:Article
Official URL/DOI:http://dx.doi.org/10.1016/j.matchar.2005.09.014
Uncontrolled Keywords:HSLA forging; Acicular ferrite; Polygonal ferrite; MA (martensite–austenite) constituents; Microalloying precipitates; Mechanical properties
Divisions:Material Science and Technology
ID Code:200
Deposited On:28 Oct 2009 15:26
Last Modified:14 Dec 2011 17:07
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