Linking Grain Boundary Microstructure to Stress Corrosion Cracking of Cold-Rolled Alloy 690 in Pressurized Water Reactor Primary Water
| Autor: | Matthew J. Olszta, Mychailo B. Toloczko, Stephen M. Bruemmer, L. E. Thomas |
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| Rok vydání: | 2013 |
| Předmět: |
Materials science
General Chemical Engineering Pressurized water reactor Metallurgy Alloy General Chemistry Intergranular corrosion engineering.material Microstructure law.invention Carbide chemistry.chemical_compound chemistry law engineering General Materials Science Grain boundary Stress corrosion cracking Chromium carbide |
| Zdroj: | CORROSION. 69:953-963 |
| ISSN: | 1938-159X 0010-9312 |
| DOI: | 10.5006/0808 |
| Popis: | Grain boundary microstructures and microchemistries are examined in cold-rolled Alloy 690 (UNS N06690) materials and comparisons are made to intergranular stress corrosion cracking (IGSCC) behavior in pressurized water reactor (PWR) primary water. Chromium carbide precipitation is found to be a key aspect for materials in both the mill-annealed and thermally treated conditions. Cold rolling to high levels of reduction was discovered to produce small IG voids and cracked carbides in alloys with a high density of grain boundary carbides. The degree of permanent grain boundary damage from cold rolling was found to depend directly on the initial IG carbide distribution. For the same degree of cold rolling, alloys with few IG precipitates exhibited much less permanent damage. Although this difference in grain boundary damage appears to correlate with measured SCC growth rates, crack tip examinations reveal that cracked carbides appeared to blunt propagation of IGSCC cracks in many cases. Preliminary results su... |
| Databáze: | OpenAIRE |
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