Record Details
Structural factors affecting wear of cobalt base hard facing alloys
ScholarsArchive at Oregon State University
| Field | Value |
|---|---|
| Title | Structural factors affecting wear of cobalt base hard facing alloys |
| Names |
Gifford, Raymond Warren
(creator) Paasche, O. G. (advisor) |
| Date Issued | 1963-05-13 (iso8601) |
| Note | Graduation date: 1963 |
| Abstract | 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. |
| Genre | Thesis/Dissertation |
| Topic | Cobalt alloys |
| Identifier | http://hdl.handle.net/1957/48811 |
