Design of Laves phase strengthened ferritic heat resisting steels in the Fe-Cr-Nb(-Ni) system

被引：39

作者：

Yamamoto, K ^{[1
]}

Kimura, Y ^{[1
]}

Wei, FG ^{[1
]}

Mishima, Y ^{[1
]}

机构：

[1] Tokyo Inst Technol, Dept Mat Sci & Engn, Midori Ku, Yokohama, Kanagawa 2268502, Japan

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2002年 / 329卷

关键词：

steel; chromium; niobium; Fe2Nb;

D O I：

10.1016/S0921-5093(01)01586-6

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A new class of heat resisting ferritic steels is investigated in the Fe-Cr-Nb and Fe-Cr-Nb-Ni systems, in which the major strengthener is the Fe2Nb Laves phase. Ferritic steels strengthened by Laves phase are expected to show excellent high temperature strength, while the brittleness of Laves phase may lower the toughness of the alloy. The alpha-Fe/Fe2Nb two-phase microstructure is selected to improve mechanical properties through changing volume fraction and morphology of Laves phase. Effects of Nb and Ni contents on the microstructure and mechanical properties of the alloys, fixed at 10 at.% Cr, have been systematically investigated. Mechanical properties were evaluated by tensile tests conducted at room temperature, 873 and 973 K. The tensile test revealed that the room temperature ductility decreases with increasing Nb content. The alloys with 1.0-1.5 at.% Nb are found to exhibit a good balance between room temperature ductility and high temperature strength. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：249 / 254

页数：6

共 8 条

[1] THE EFFECT OF TUNGSTEN ON DISLOCATION RECOVERY AND PRECIPITATION BEHAVIOR OF LOW-ACTIVATION MARTENSITIC 9CR STEELS [J].