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Avaliação Da Influência De Adições De Molibdênio, Ferro E Cromo No Comportamento De Sinterização E Nas Propriedades Mecânicas Do Metal Duro À Base De Níquel
| Content Provider | Semantic Scholar |
|---|---|
| Author | Cabral, André Bittencourt |
| Copyright Year | 2014 |
| Abstract | Alternative binders have been extensively studied to replace, totally or partially, the traditional cobalt binder in cemented carbides. Among the commonly adopted binders, nickel has received the most attention due to its economic aspects and comparable mechanical properties. In this work, two processing routes have been developed, involving nickel oxide and metallic nickel powder. The effects of Mo and Fe-Cr prealloyed additions on sintering behavior and mechanical properties of Nibased cemented carbides were investigated. The composites were processed by conventional powder metallurgy. The samples were sintered at temperatures ranging from 1400 to 1500 °C. Sintered compacts were characterized microstructurally and had their Vickers hardness and fracture toughness determined. The WC-10Ni composition presented values of mechanical properties compatible with those described in literature. Dilatometric analyses revealed little influence of molybdenum on the sintering behavior of nickel-based cemented carbide. The addition of iron and chromium showed a significant shift in the onset of shrinkage for higher temperatures, decreasing the contribution of solid state sintering to the total shrinkage of the sample. The combined addition of molybdenum, iron and chromium, also significantly shifted the onset of shrinkage for higher temperatures and showed greater inhibition of grain growth. High carbon contents had a strong influence on increasing densification. Molybdenum promoted solid solution strengthening, as well as iron and chromium, but molybdenum also maintained higher values of fracture toughness. Among the samples studied, the WC-9Ni-1Mo and WC-9Ni-0,5Mo0,5(Fe,Cr) compositions led to the better relation between hardness and toughness fracture. The hardness of these materials, around 1300 HV10, was lower than expected, but high fracture toughness was achieved, showing potential for applications in mining and civil engineering sectors. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://repositorio.ufsc.br/xmlui/bitstream/handle/123456789/123375/327115.pdf;jsessionid=4FDA5B80B592F2C08BBF51D89F707C35?sequence=1 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
