Graduate Thesis Or Dissertation
 

Structural factors affecting wear of cobalt base hard facing alloys

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  • This paper is a metallurgical study of the microstructure of a cobalt base hard facing alloy to determine the cause for inconsistant wear properties. Wear tests on a Stellite 6 alloy, deposited using oxyacetylene welding techniques, resulted in a wide range of weight losses. Microscopic examination has revealed the probable cause to be variations in carbon content after welding. Cooling rates may also be a contributing factor. The "as received" structure of the Stellite alloy is a matrix of fine carbides surrounding large dendrites of cobalt rich material. The use of a reducing flame during welding causes an increase in carbon resulting in a structure of massive, hard, and brittle primary carbides in a soft but tough cobalt matrix containing eutectic microconstituents and free graphite. This structure appears to be the most desirable one for a superior wearing material when subjected to dry grinding abrasion.
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  • File scanned at 300 ppi using Capture Perfect 3.0 on a Canon DR-9050C in PDF format. CVista PdfCompressor 5.0 was used for pdf compression and textual OCR.
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