Kinetic transitions and substititional solute (Mn) fields associated with later stages of ferrite growth in Fe-C-Mn-Si

被引：0
作者：
H. Guo
G. R. Purdy
M. Enomoto
H. I. Aaronson
机构：
[1] University of Science and Technology,Department of Physics and Chemistry
[2] McMaster University,Department of Materials Science and Engineering
[3] Ibaraki University,School of Physics and Materials Engineering
[4] R.F. Mehl University Professor Emeritus,undefined
[5] with Carnegie Mellon University,undefined
[6] Monash University,undefined
来源：
Metallurgical and Materials Transactions A | 2006年 / 37卷
关键词：
Ferrite; Austenite; Material Transaction; Scanning Transmission Electron Microscopy; Carbon Diffusion;
D O I：
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中图分类号：
学科分类号：
摘要：
A low-carbon balloy steel with relatively high Mn and Si concentrations (0.04 wt pct C-3 wt pct Mn-1.9 wt pct Si) has been used to explore the effects of alloy chemistry and austenite grain size on ferrite growth. Even at high levels of supersaturation, the volume fraction of ferrite is found to increase slowly relative to the relaxation time for carbon diffusion. A series of scanning transmission electron microscopy (STEM) analyses for Mn indicates that initial unpartitioned ferrite growth is replaced by partitioned growth, accompanied by a dramatic drop in growth rate, and a persistent level of residual supersaturation in the remaining austenite. The results are interpreted in terms of a transition from an initial paraequilibrium interfacial condition to partitioned ferrite growth.
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页码：1721 / 1729
页数：8
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