| Autor: |
M.V. Fedorov, E.V. Danzanova, M.I. Vasilyeva |
| Rok vydání: |
2019 |
| Předmět: |
|
| Zdroj: |
Procedia Structural Integrity. 20:206-211 |
| ISSN: |
2452-3216 |
| DOI: |
10.1016/j.prostr.2019.12.140 |
| Popis: |
The article presents a fracture surface analysis of hard-alloy tungsten-cobalt plates of a group WC8 with ultrafine additives in impact-abrasive wear. When testing on impact-abrasive wear, a wearing surface repeatedly hits the abrasive layer. Magnesium spinel powders (MgAl2O4) are used as ultrafine additives, and for comparison, silicon carbide (SiC) additives are considered. A percentage of additives is varied in composition test specimens. The geometric parameters of test specimens without additives and with ultrafine additives are the same. This analysis of fracture surface contributes to a risk prediction of studied material premature destruction and failure. The insertion of ultrafine additives of magnesium spinel and silicon carbide into tungsten-cobalt alloys supports to reduce the WC grain size and increase the hardness values of the samples than the sample without additives. Based on the macroanalysis of the fracture surface of the specimens it is identified that the character of fracture are depending on the composition of the material. Prevailing wear type is a chipping WC particles. In the studied specimens with the additives of magnesium spinel (MgAl2O4) and silicon carbide (SiC), areas with small elements of ductile fracture are detected. A change of the fracture character is detected when ultrafine additives are added to the composition of tungsten-cobalt alloys: the fracture of the specimen without additives is brittle, but the fracture of specimens with the ultrafine powder additives of magnesium spinel and silicon carbide is intergranular, quasi-brittle. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
