An Atom Probe Study of κ-carbide Precipitation in Austenitic Lightweight Steel and the Effect of Phosphorus

被引:0
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作者
L. N. Bartlett
D. C. Van Aken
J. Medvedeva
D. Isheim
N. Medvedeva
K. Song
机构
[1] Missouri University of Science and Technology,Institute of Solid State Chemistry
[2] Northwestern University,undefined
[3] Ural Branch of the Russian Academy of Science,undefined
[4] FEI Company,undefined
来源
Metallurgical and Materials Transactions A | 2017年 / 48卷
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摘要
The influence of phosphorus on κ-carbide precipitation and alloy partitioning in an austenitic Fe-30Mn-9Al-1Si-0.9C-0.5Mo cast steel was studied utilizing a combination of transmission electron microscopy, 3D atom probe tomography, X-ray diffraction, and first-principles atomistic modeling. Increasing the amount of phosphorus from 0.006 to 0.043 wt pct P increased the kinetics of the initial ordering reaction. Specimens from the high-phosphorus steel showed some degree of short-range ordering of Fe-Al-C that took place during the quench. It was shown that phosphorus increases both the size and volume fraction of κ-carbide during aging. However, the distribution of phosphorus appears to be homogeneous, and thus long-range diffusion of phosphorus was not responsible for the observed increase in hardening. It is shown that phosphorus encourages the initial short-range ordering into the E21 structure of κ-carbide and also accelerates spinodal decomposition associated with carbon and aluminum diffusions.
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页码:5500 / 5515
页数:15
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