TY - JOUR
T1 - Surface hardening and precipitation behaviors in plasma-nitrided Fe-(2-x) at%Al-x at%Ti alloys
AU - Zhu, Meng
AU - Miyamoto, Goro
AU - Furuhara, Tadashi
N1 - Publisher Copyright:
© 2019 Iron and Steel Institute of Japan. All Rights Reserved.
Copyright:
Copyright 2019 Elsevier B.V., All rights reserved.
PY - 2019/2
Y1 - 2019/2
N2 - Synopsis: The alloying effects of Ti, which is strongly attracted to nitrogen (N), on nitride precipitation and the resultant surface hardening in nitrided Fe-Al-Ti alloys, were investigated using three-dimensional atom probe tomography. Ti addition promotes nucleation of Al nitrides, which leads to substantial surface hardening. As the amount of added Ti increases, the hardness near the surface increases because the nucleation of Al nitrides is promoted, likely due to the higher density of Ti-N clusters. However, the effect of Ti on surface hardening by nitriding in Fe-Al alloys is weaker than that of V addition, as reported previously, although Ti is a stronger cluster-forming element than V. These results suggest that, in addition to the ability to form clusters, the potency of clusters for AlN nucleation needs to be considered to control AlN precipitation by solute clustering.
AB - Synopsis: The alloying effects of Ti, which is strongly attracted to nitrogen (N), on nitride precipitation and the resultant surface hardening in nitrided Fe-Al-Ti alloys, were investigated using three-dimensional atom probe tomography. Ti addition promotes nucleation of Al nitrides, which leads to substantial surface hardening. As the amount of added Ti increases, the hardness near the surface increases because the nucleation of Al nitrides is promoted, likely due to the higher density of Ti-N clusters. However, the effect of Ti on surface hardening by nitriding in Fe-Al alloys is weaker than that of V addition, as reported previously, although Ti is a stronger cluster-forming element than V. These results suggest that, in addition to the ability to form clusters, the potency of clusters for AlN nucleation needs to be considered to control AlN precipitation by solute clustering.
KW - Cluster
KW - I-s interaction
KW - Nitriding
KW - Precipitation
KW - Three dimensional atom probe
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U2 - 10.2355/tetsutohagane.TETSU-2018-109
DO - 10.2355/tetsutohagane.TETSU-2018-109
M3 - Article
AN - SCOPUS:85062503168
VL - 105
SP - 202
EP - 211
JO - Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
JF - Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
SN - 0021-1575
IS - 2
ER -