A comparison of carbide fracture during fixed depth and fixed load scratch tests
In order to simulate abrasion of dual-phase materials containing large carbides under fixed depth conditions an apparatus has been designed and used to perform scratch tests at a fixed depth of cut on such materials. The scratch test consists of two support arms tipped with small steel balls held in contact with surface by /sup 700/ g, while the scratch tool is mounted on the tip of a central arm whose adjustable length allow control of the depth of cut. The scratch tool does not deflect significant when it encounters a large carbide. Scratch tests with the new apparatus have been performed on Co-base Stellite alloys containing large Cr-rich carbides, using individual particles of alumina as scratch tools to generate fixed depth scratches. A in situ SEM scratch test apparatus has also been used to genrate fixed load scratches. Comparison of the scratches shows that for comparable average scratch depths, under fixed load conditions the scratch tool deflects over the carbides without causing fracture, but that since it cannot deflect under fixed depth conditions it induces gross carbide fracture. Results suggest that the fixed depth scratch test can be successfully employed to simulate fixed depth abrasion, which has been previously shown to generate gross carbide fracture in these alloys. The in situ SEM scratch test simulates fixed load abrasion conditions such as those which occur in rubber wheel abrasion tests. 12 refs., 9 figs
- Research Organization:
- Notre Dame Univ., IN (USA). Dept. of Metallurgical Engineering and Materials Science
- DOE Contract Number:
- AC02-81ER10963
- OSTI ID:
- 5313841
- Report Number(s):
- DOE/ER/10963-4; CONF-850415-8; ON: DE88008354
- Resource Relation:
- Conference: 4. international conference on wear of materials, Vancouver, Canada, 14 Apr 1985
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
STELLITE
ABRASION
MATERIALS TESTING
WEAR RESISTANCE
STELLITE 6
CARBIDES
DEPTH
MEASURING INSTRUMENTS
SCANNING ELECTRON MICROSCOPY
ALLOYS
CARBON COMPOUNDS
CHROMIUM ALLOYS
COBALT ALLOYS
COBALT BASE ALLOYS
DIMENSIONS
ELECTRON MICROSCOPY
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
IRON ALLOYS
MATERIALS
MECHANICAL PROPERTIES
MICROSCOPY
NICKEL ALLOYS
TESTING
TUNGSTEN ALLOYS
360103* - Metals & Alloys- Mechanical Properties
420500 - Engineering- Materials Testing