| Autor: |
Mart Viljus, Fjodor Sergejev, Eduard Kimmari |
| Rok vydání: |
2011 |
| Předmět: |
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| Zdroj: |
Procedia Engineering. 10:2873-2881 |
| ISSN: |
1877-7058 |
| DOI: |
10.1016/j.proeng.2011.04.477 |
| Popis: |
The carbide composites are best known for their high hardness; evaluate bending strength and excessive, ceramic-like, brittleness. The titanium carbide based carbide composites (TiC-based cermets) are prospective candidates for tooling in sheet-metal forming (stamping) processes. The wear resistance (adhesive and functional) of some TiC-Fe/Ni cermets is better than that of hardmetals. Previous studies have shown that TiC carbide grains better absorb plastic deformation during cyclic loading (fatigue) and have lower fatigue sensitivity if compared to tungsten carbide grains in conventional hardmetal (WC-Co). The core-rim (double-carbide) structure of the carbide grains is characteristic for TiC-based cermets. The effect of core-rim structure on the behavior of the cermets is poorly investigated. Such a structure is highly dependent on the production technology (powder metallurgy routes) as the difference between the coefficients of thermal expansion of components is obvious cause of high residual stresses appearing after sintering of pressed powder parts. Although, the thermal expansion coefficients of TiC-based cermets are lower than those of WC-based hardmetals. The instrumented indentation technique is used to determine the scope of residual stresses in TiC-based cermets. The first steps are made for evaluation of the residual stresses proportions of the carbide and binder phases, core-rim structures in carbide composites. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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