Corrosion-Fatigue (Circumferential) Cracking in Cr-Mo Low Alloy Boiler Tube Steels: Part 1—Initiation and Propagation

[+] Author and Article Information
B. J. Smith, A. R. Marder

Energy Research Center, Lehigh University, Bethlehem, PA 18015

J. Eng. Mater. Technol 114(3), 265-269 (Jul 01, 1992) (5 pages) doi:10.1115/1.2904171 History: Received April 19, 1991; Revised November 29, 1991; Online April 29, 2008


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 by an environmentally assisted thermal fatigue crack propagation mechanism.

Copyright © 1992 by The American Society of Mechanical Engineers
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