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

被引：53

作者：

Pancholi, V. ^{[2
]}

Krishnan, Madangopal ^{[1
]}

Samajdar, I. S. ^{[3
]}

Yadav, V. ^{[3
]}

Ballal, N. B. ^{[3
]}

机构：

[1] Bhabha Atom Res Ctr, Div Mat Sci, Bombay 400085, Maharashtra, India

[2] Indian Inst Technol, Dept Met & Mat Engn, Roorkee 247667, Uttarakhand, India

[3] Indian Inst Technol, Dept Met Engn & Mat Sci, Bombay 400076, Maharashtra, India

来源：

ACTA MATERIALIA | 2008年 / 56卷 / 09期

关键词：

EBSD; bainite; self-accommodation; microtexture; orientation relationship;

D O I：

10.1016/j.actamat.2007.12.057

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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. Published by Elsevier Ltd. All rights reserved.

引用

页码：2037 / 2050

页数：14

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