Ultrahigh strength hot rotted microalloyed steel: microstructure and properties

Ghosh, Arindam and Das, Samar and Chatterjee, S (2005) Ultrahigh strength hot rotted microalloyed steel: microstructure and properties. Materials Science and Technology, 21 (3). pp. 325-333.

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A low carbon steel alloyed with Ni, Mn, Mo, Cu and microalloyed with Nb and Ti was prepared. Continuous cooling transformation behaviour of the steel was evaluated. Formation of polygonal or Widmanstatten ferrite is suppressed at high temperature and the 'C' curve is shifted to an extreme right. At lower temperatures a flat top 'C' curve with a mixed structure of bainite and martensite was obtained and the transformation temperatures do not vary much with a wide range of cooling rates. The steel was thermomechanically processed at different finishing temperatures and ultrahigh strength values were obtained as a result of austenite grain refinement, highly dislocated fine lath martensite structure along with tiny precipitates of microalloying carbide and carbonitride at all finish rolling temperatures. The stable and large TiN/TiCN particles formed during casting have impaired the impact toughness values at ambient and at -40 degrees C

Item Type:Article
Official URL/DOI:DOI: 10.1179/174328405X27043
Uncontrolled Keywords:ultrahigh strength steel; microalloying; microstructure; mechanical properties; TEM
Divisions:Material Science and Technology
ID Code:3331
Deposited By:Sahu A K
Deposited On:14 Jul 2011 17:19
Last Modified:19 Sep 2014 16:35
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