Site-specific atomic-scale characterisation of retained austenite in a strip cast TRIP steel

被引：72
作者：
Xiong, Z. P. [1 ]
Saleh, A. A. [1 ]
Marceau, R. K. W. [2 ]
Taylor, A. S. [2 ]
Stanford, N. E. [3 ]
Kostryzhev, A. G. [1 ]
Pereloma, E. V. [1 ,4 ]
机构：
[1] Univ Wollongong, Sch Mech Mat & Mechatron Engn, Wollongong, NSW 2522, Australia
[2] Deakin Univ, Inst Frontier Mat, Geelong, Vic 3216, Australia
[3] Monash Univ, Dept Mat Sci & Engn, Clayton, Vic 3800, Australia
[4] Univ Wollongong, Electron Microscopy Ctr, Wollongong, NSW 2519, Australia
来源：
ACTA MATERIALIA | 2017年 / 134卷
基金：
澳大利亚研究理事会;
关键词：
Retained austenite; Carbon content; Atom probe tomography; Isothermal bainite transformation; Morphology; HIGH-STRENGTH STEELS; INDUCED-PLASTICITY STEELS; CARBIDE-FREE BAINITE; X-RAY-DIFFRACTION; PROBE TOMOGRAPHY; MECHANICAL-PROPERTIES; ALLOYING ELEMENTS; TENSILE BEHAVIOR; ELECTRON-MICROSCOPY; TRANSFORMATION;
D O I：
10.1016/j.actamat.2017.05.060
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Knowledge of carbon content in retained austenite (RA) with different neighbouring phases is essential to understand the chemical stability of RA, which is useful for microstructure tuning of transformation-induced plasticity (TRIP) steels. The present study investigates different morphologies and chemical compositions of RA by correlating electron backscattering diffraction, transmission electron microscopy and atom probe tomography. The effect of neighbouring phases, such as polygonal ferrite, bainitic ferrite lath, ferrite in granular bainite and carbides, on the carbon content in the RA is investigated. The results reveal that the film RA morphology does not always have a higher carbon content than the blocky RA; as coarse RA sometimes displays a higher carbon content than the fine RA films or islands depending on the neighbouring phases. The diffusion of carbon and manganese between austenite and ferrite in bainitic ferrite/granular bainite has been explained according to either diffusionless and/or diffusional mechanism of bainitic ferrite formation followed by tempering. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：1 / 15
页数：15
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