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RESEARCH PAPERS

The Initiation of Environmentally Assisted Cracking in Semi-Elliptical Surface Cracks

[+] Author and Article Information
L. A. James

Bettis Atomic Power Laboratory, Westinghouse Electric Corporation, P.O. Box 79, West Mifflin, PA 15122-0079

J. Pressure Vessel Technol 120(2), 200-206 (May 01, 1998) (7 pages) doi:10.1115/1.2842241 History: Received November 14, 1997; Revised December 05, 1997; Online February 11, 2008

Abstract

A Criterion to predict under what conditions EAC would initiate in cracks in a high-sulfur steel in contact with low-oxygen water was recently proposed by Wire and Li (1996). This EAC initiation criterion was developed using transient analyses for the diffusion of sulfides plus experimental test results. The experiments were conducted mainly on compact tension-type specimens with initial crack depths of about 2.54mm. The present paper expands upon the work of Wire and Li by presenting results for significantly deeper initial semi-elliptical surface cracks. In addition, in one specimen, the surface crack penetrated weld-deposited cladding into the high-sulfur steel. The results for the semi-elliptical surface cracks agreed quite well with the EAC initiation criterion, and provide confirmation of the applicability of the criterion to crack configurations with more restricted access to water.

Copyright © 1998 by The American Society of Mechanical Engineers
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