Effect of Ti Addition on Oxidation Behavior of High-Purity Ferritic Stainless Steel

被引：1

作者：

Inoue, Yoshiharu ^{[1
]}

Hiraide, Nobuhiko ^{[2
]}

Hayashi, Atsutaka ^{[2
]}

Ushioda, Kohsaku ^{[3
,4
]}

机构：

[1] Nippon Steel & Sumitomo Met Corp, Yawata R&D Lab, Kitakyushu, Fukuoka 8048501, Japan

[2] Nippon Steel & Sumikin Stainless Steel Corp, R&D Ctr, Hikari 7438550, Japan

[3] Nippon Steel & Sumikin Res Inst Corp, Tokyo 1000005, Japan

[4] Kanazawa Univ, Grad Sch Nat Sci & Technol, Kanazawa, Ishikawa 9201192, Japan

来源：

JOURNAL OF THE JAPAN INSTITUTE OF METALS AND MATERIALS | 2018年 / 82卷 / 05期

关键词：

ferritic stainless steel; titanium; oxidation; air; scale; SEM; EBSD; TEM; HIGH-TEMPERATURE OXIDATION; TITANIUM; ALLOYS;

D O I：

10.2320/jinstmet.J2017051

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The effect of Ti addition on the oxidation resistance of high. purity 19% Cr ferritic stainless steels has been investigated during isothermal heat treatment at temperatures between 1073 K and 1273 K in air. The microstructures of scale and the scale/metal interface were investigated in detail by means of SEM-EBSD and FE-TEM together with mu-EDS. The Ti addition increases the oxidation mass gains but simultaneously improves the critical temperature of the oxidation resistance. The formed scale is mainly Cr2O3 regardless of the addition of Ti but Ti addition increases the thickness of Cr2O3. Considerable reduction in the grain size of Cr2O3 by Ti addition was recognized, which was inferred to increase the oxidation mass gain due to the easy diffusion through the grain boundary. Furthermore, Ti is oxidized beneath the scale/metal interface as internal complex oxides, such as Al2TiO5 and Al2Ti7O15 because of the small amount of aluminum in the steels used. In a somewhat deeper region from the interface, theta-Al2O3 forms where Ti cannot be oxidized. The oxygen getter effect by Ti atoms is postulated to be responsible for improving the oxidation resistance.

引用

页码：130 / 139

页数：10

共 13 条

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