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- Title
Fracture of Alloy Steel Cap Screws in a Refrigeration Compressor.
- Authors
Witherell, Charles E.
- Abstract
Uncoated high-strength alloy steel cap screws retaining a cast aluminum (356.0) diffuser assembly in a centrifugal refrigerant compressor failed in a brittle manner a short time after the system was placed in operation. Evidence obtained during the failure analysis indicated that the failures were the result of hydrogen embrittlement produced by galvanic corrosion and attendant evolution of hydrogen at the dissimilar junction, which was also the site of the highest tensile stress. Suggested measures for minimizing recurrences included use of lower-strength, galvanically-compatible fasteners and appropriately-applied and treated compatible coatings.
- Subjects
STEEL alloys; STEEL fracture; SCREW compressors; HYDROGEN embrittlement of metals; CENTRIFUGAL compressors; REFRIGERATION &; refrigerating machinery; ELECTROLYTIC corrosion
- Publication
Journal of Failure Analysis & Prevention, 2022, Vol 22, Issue 5, p2087
- ISSN
1547-7029
- Publication type
Article
- DOI
10.1007/s11668-022-01519-1