Fatigue behaviour of type 444 stainless steel at elevated temperatures

被引：0

作者：

Akita, Masayuki ^{[1
]}

Nakajima, Masaki ^{[2
]}

Uematsu, Yoshihiko ^{[1
]}

Tokaji, Keiro ^{[1
]}

机构：

[1] Gifu Univ, Fac Engn, 1-1 Yanagido, Gifu 5011193, Japan

[2] Tokyo Natl Coll Technol, Toyota 4718525, Japan

来源：

MECHANICAL BEHAVIOR OF MATERIALS X, PTS 1AND 2 | 2007年 / 345-346卷

关键词：

fatigue behaviour; ferritic stainless steel; elevated temperature; crack growth; crack initiation; 748K embrittlement;

D O I：

10.4028/www.scientific.net/KEM.345-346.263

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This paper describes the fatigue behaviour at elevated temperatures in a ferritic stainless steel, type 444. Test temperatures evaluated were ambient temperature, 673K and 773K in laboratory air. Fatigue strength decreased at elevated temperatures compared with at ambient temperature. At all temperatures, cracks were generated at the specimen surface due to cyclic slip deformation, but fractographic analysis revealed a brittle features in fracture surface near the crack initiation site at elevated temperatures. Cracks initiated earlier at elevated temperatures than at ambient temperature and subsequent small cracks grew faster at elevated temperatures even though the difference in elastic modulus was taken into account, indicating the decrease in crack initiation resistance and crack growth resistance. The observed decrease in both resistances was discussed in relation to the 748K(475 degrees C) embrittlement in ferritic stainless steels.

引用

页码：263 / +

页数：2

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