Creep characteristics of precipitation hardened carbon free martensitic alloys

被引：9

作者：

Muneki, S ^{[1
]}

Igarashi, M ^{[1
]}

Abe, F ^{[1
]}

机构：

[1] Natl Res Inst Met, Frontier Res Ctr Struct Mat, Tsukuba, Ibaraki 3050047, Japan

来源：

CREEP AND FRACTURE OF ENGINEERING MATERIALS AND STRUCTURES | 2000年 / 171-1卷

关键词：

fe-ni-co martensite; homogeneous deformation; USC plant; boilers; long term stability;

D O I：

10.4028/www.scientific.net/KEM.171-174.491

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A new attempt has been demonstrated using carbon free Fe-Ni-Co martensitic alloys strengthened by Laves phase such as Fe2W or Fe2Mo to achieve homogeneous creep deformation at high temperatures under low stress levels. Creep behavior of the alloys is found to be completely different from that of the conventional high-Cr ferritic steels. The alloys exhibit gradual change in the creep rate with strain both in the transient and acceleration creep regions, and give a larger strain for the minimum creep rate. In these alloys the creep deformation takes place very homogeneously and no heterogeneous creep deformation is enhanced even at low stress levels. The minimum creep rates of the Fe-Ni-Co alloys at 700 degrees C are found to be much lower than that of the conventional steel, which is due to fine dispersion strengthening useful even at 700 degrees C in these alloys. It is thus concluded that the Fe-Ni-Co martensite strengthened by Laves phase is very useful to increase the creep resistance at elevated temperatures over 650 degrees C.

引用

页码：491 / 498

页数：8