CORROSION-FATIGUE (CIRCUMFERENTIAL) CRACKING IN CR-MO LOW-ALLOY BOILER TUBE STEELS .1. INITIATION AND PROPAGATION

被引：3
|
作者：
SMITH, BJ
MARDER, AR
机构：
[1] Energy Research Center, Lehigh University, Bethlehem, PA
来源：
JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY-TRANSACTIONS OF THE ASME | 1992年 / 114卷 / 03期
关键词：
D O I：
10.1115/1.2904171
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
The metallurgical mechanism responsible for the initiation and propagation of circumferentially oriented, fireside cracks on waterwall boiler tubes was investigated. The materials studied were Cr-Mo low alloy steels in the as-received and post-service (exhibited cracking) condition. It was determined that cracks were initiated by a corrosion/fatigue interactive mechanism at the fireside tube surface. The corrosion mechanism is sulfidation while the material fatigue degradation occurs due to thermal stress cycles. Crack propagation occurs hy an environmentally assisted thermal fatigue crack propagation mechanism.
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页码：265 / 269
页数：5
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