Formation/consolidation of WC-Co cermets by simple shear
Previous research using equal channel angular extrusion (ECAE) has shown that the process can be used to produce ultrafine equiaxed grains and filamentary microstructures. This method can also be used to effectively consolidate discontinuous material such as powder. A drawback of conventional extrusion is that the resulting inhomogeneous deformation is often not ideal for complex shaped industrial parts. In contrast, ECAE can be used for uniform deformations by simple shear to produce large and small cross-section material form which parts can be made. The extrusion procedure is carried out by extruding a long billet from an inlet channel to an exit channel of the same size which intersects the inlet channel at a sharp angle; 90{degree} is typical. The process can be repeated on the same part to impart a large amount of shear deformation to the entire billet, except for small end areas. The principal objective of this study was to determine the effect of simple shear on the consolidation of WC-Co powders. The effect of the extrusion temperature and the amount of shear on the compaction and formation of the WC cermets were investigated. In this research, the successful consolidation of (W+C)-Co and WC-Co powders by ECAE is reported. The ECAE processed WC-Co phases and sample properties compare favorably with those of conventionally sintered material.
- Research Organization:
- Texas A and M Univ., College Station, TX (US)
- OSTI ID:
- 20075955
- Journal Information:
- Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 9 Vol. 42; ISSN 1359-6462; ISSN SCMAF7
- Country of Publication:
- United States
- Language:
- English
Similar Records
Hot working of Ti-6Al-4V via equal channel angular extrusion
Production of submicron-grained structure in aluminum 3003 by ECAE