THE EFFECT OF OXIDATION ON FATIGUE CRACK-GROWTH IN 2.25 CR-1MO STEEL AT 525-DEGREES-C - A METALLOGRAPHIC EXAMINATION

被引：6

作者：

CHALLENGER, KD ^{[1
]}

SKELTON, RP ^{[1
]}

KAMEN, JS ^{[1
]}

机构：

[1] CENT ELECT RES LABS,CENT ELECT GENERATING BOARD,DIV TECHNOL PLANNING & RES,LEATHERHEAD KT22 7SE,SURREY,ENGLAND

来源：

MATERIALS SCIENCE AND ENGINEERING | 1987年 / 91卷

关键词：

FRACTURE MECHANICS - IRON CHROMIUM MOLYBDENUM ALLOYS - Crack Propagation - STEEL HEAT TREATMENT - STEEL TESTING - Fracture;

D O I：

10.1016/0025-5416(87)90276-X

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The fatigue cracking characteristics of 2. 25Cr-1Mo steel has been studied in air and vacuum at 525 degree C using high strain and linear elastic fracture mechanics test specimens. No effect of heat treatment (annealed vs. normalized and tempered) on the crack path or fracture surface characteristics was observed. However, a large effect of environment on the cracking characteristics was found. Flat fractures resulting from a single unbranched transgranular crack were typical of all samples tested in air independent of cyclic frequency and cyclic waveform. Tests in vacuum, however, exhibited cracks with considerable branching, resulting in a very irregular fracture surface caused by mixed transgranular and intergranular cracking. Compressive dwell periods appear to cause rewelding at the crack tip for all tests in vacuum.

引用

页码：1 / 6

页数：6

共 9 条

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