Surface Hardening and Precipitation Behaviors in Plasma-nitrided Fe-(2-x) at%Al-x at%Ti Alloys

被引：3

作者：

Zhu, Meng ^{[1
]}

Miyamoto, Goro ^{[2
]}

Furuhara, Tadashi ^{[2
]}

机构：

[1] Tohoku Univ, Grad Sch Met, Aoba Ku, 2-1-1 Katahira, Sendai, Miyagi 9808577, Japan

[2] Tohoku Univ, Inst Mat Res, Sendai, Miyagi, Japan

来源：

TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN | 2019年 / 105卷 / 02期

基金：

日本学术振兴会;

关键词：

nitriding; precipitation; cluster; three dimensional atom probe; i-s interaction; EXCESS NITROGEN UPTAKE; CRYSTAL-STRUCTURE; CR; MORPHOLOGY; TEM;

D O I：

10.2355/tetsutohagane.TETSU-2018-109

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

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.

引用

页码：202 / 211

页数：10