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Self-accommodation in the bainitic microstructure of ultra-high-strength steel

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Title Self-accommodation in the bainitic microstructure of ultra-high-strength steel
 
Creator PANCHOLI, V
KRISHNAN, M
SAMAJDAR, IS
YADAV, V
BALLAL, NB
 
Subject heat-affected zone
low-alloy steel
coherent transformations
cleavage fracture
c alloys
austenite
ebsd
bainite
self-accommodation
microtexture
orientation relationship
 
Description 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.
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2011-08-26T11:13:57Z
2011-12-26T12:57:25Z
2011-12-27T05:40:30Z
2011-08-26T11:13:57Z
2011-12-26T12:57:25Z
2011-12-27T05:40:30Z
2008
 
Type Article
 
Identifier ACTA MATERIALIA, 56(9), 2037-2050
1359-6454
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
 
Language en