Ferrite channel effect on ductility and strain hardenability of ultra high strength dual phase steel

Ravi Kumar, B and Patel, N K and Mukherjee, K and Walunj, Mahesh and Mandal, G K and Venugopalan, T (2017) Ferrite channel effect on ductility and strain hardenability of ultra high strength dual phase steel. Materials Science and Engineering A- Structural Materials Properties Microstructure and Processing, 685 (IF-3.094). pp. 187-193.

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This study describes an effect of controlled austenite decomposition on microstructure evolution in dual phase steel. Steel sheets austenitized at various annealing temperatures were rapidly cooled to the inter-critical annealing temperature of 800 degrees C for the isothermal decomposition of austenite and then ultra fast cooled to room temperature. The scanning electron microscope analysis of evolving microstructure revealed ferrite nucleation and growth along prior austenite grain boundaries leading to ferrite network/channel formation around martensite. The extent of ferrite channel formation showed a strong dependence on the degree of undercooling in the inter-critical annealing temperature regime. Uniaxial tensile deformation of processed steel sheets showed extensive local inter-lath martensite damage activity. Extension/propagation of these local micro cracks to neighboring martensite grains was found to be arrested by ferrite channels. This assisted in delaying the onset of global damage which could lead to necking and fracture. The results demonstrated an alternate possible way of inducing ductility and strain hardenability in ultra high strength dual phase steels.

Item Type:Article
Official URL/DOI:http://www.sciencedirect.com/science/article/pii/S...
Uncontrolled Keywords:Dual phase steel; Ultra high strength; Austenite Decomposition; Ferrite nucleation
Divisions:Material Science and Technology
ID Code:7589
Deposited By:Sahu A K
Deposited On:18 Aug 2017 09:53
Last Modified:03 Nov 2017 15:10
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