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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/11286

Title: Self-accommodation in the bainitic microstructure of ultra-high-strength steel
Authors: PANCHOLI, V
KRISHNAN, M
SAMAJDAR, IS
YADAV, V
BALLAL, NB
Keywords: heat-affected zone
low-alloy steel
coherent transformations
cleavage fracture
c alloys
austenite
Issue Date: 2008
Publisher: PERGAMON-ELSEVIER SCIENCE LTD
Citation: ACTA MATERIALIA, 56(9), 2037-2050
Abstract: In this study, the bainitic microstructure of a furnace-cooled electro-slag-refined 5% Cr steel was studied by the electron backscattered diffraction (EBSD) technique. The pole figures suggest a strong orientation relationship close to the Nishiyama-Wassermann type, i.e. there are 12 variants of the bainite sheaf that emerge from the three Bain correspondences. The microstructure consists of the bainite variants arranged in four sheaf colonies or morphological groups. Each sheaf colony, in turn, is made of one crystallographic group composed of 3 variants of bainite - one from each of the three Bain correspondences. Computations based on the phenomenological theory of martensitic crystallography (PTMC) show that the observed morphology is a product of stress-coupled autocatalytic nucleation. The < 1 1 1 >(Austenite) 3-variant tension-coupled sheaf group predicted by the computations is the one that is experimentally observed. (c) 2008 Acta Materialia Inc.
URI: http://dx.doi.org/10.1016/j.actamat.2007.12.057
http://dspace.library.iitb.ac.in/xmlui/handle/10054/11286
http://hdl.handle.net/10054/11286
ISSN: 1359-6454
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