Redistribution of alloying elements during tempering of a nanocrystalline steel

被引：137

作者：

Caballero, F. G. ^{[1
]}

Miller, M. K. ^{[2
]}

Garcia-Mateo, C. ^{[1
]}

Capdevila, C. ^{[1
]}

Babu, S. S. ^{[3
]}

机构：

[1] CSIC, CENIM, E-28040 Madrid, Spain

[2] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA

[3] Edison Welding Inst, Tech Div, Columbus, OH 43221 USA

来源：

ACTA MATERIALIA | 2008年 / 56卷 / 02期

关键词：

tempering; atom probe field ion microscopy (AP-FIM); bainitic steels; phase transformations;

D O I：

10.1016/j.actamat.2007.09.018

中图分类号：

T [工业技术];

学科分类号：

08 [工学];

摘要：

Redistribution of alloying elements during tempering of a novel nanocrystalline steel consisting of a mixture of lower bainitic ferrite and carbon-enriched retained austenite has been analyzed by atom probe tomography. Three physical processes, namely redistribution of substitutional solute across the austenite/bainitic ferrite interface before retained austenite decomposition, redistribution of solute across the lower bainite cementite/ferrite interface, and the precipitation of transition carbides and cementite, have been observed. Results suggest that retained austenite decomposes during tempering before full equilibrium is reached at the interface. Moreover, cementite precipitates from supersaturated ferrite via a paraequilibrium transformation mechanism. (c) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：188 / 199

页数：12

共 29 条

[1]

ATOM-PROBE FIELD-ION MICROSCOPY STUDY OF THE PARTITIONING OF SUBSTITUTIONAL ELEMENTS DURING TEMPERING OF A LOW-ALLOY STEEL MARTENSITE [J].