Effect of Post-Weld Heat Treatment on Microstructural Evolution and Abrasive Wear of Nanostructured Fe-Based Hardfacing
New multi-component alloys have been recently developed for applications in coatings deposited by welding. These microstructures consist on the precipitates of ultra-hard carbo-borides in a matrix with high hardness. Post-weld heat treatment is a relevant aspect to adjusting the final propierties of...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2022 |
| País: | Argentina |
| Institución: | Consejo Nacional de Investigaciones Científicas y Técnicas |
| Repositorio: | CONICET Digital (CONICET) |
| Idioma: | inglés |
| OAI Identifier: | oai:ri.conicet.gov.ar:11336/214251 |
| Acceso en línea: | http://hdl.handle.net/11336/214251 |
| Access Level: | acceso abierto |
| Palabra clave: | ABRASIVE WEAR FLUX-CORED ARC WELDING HARDFACING POST-WELD HEAT TREATMENT https://purl.org/becyt/ford/2.5 https://purl.org/becyt/ford/2 |
| Sumario: | New multi-component alloys have been recently developed for applications in coatings deposited by welding. These microstructures consist on the precipitates of ultra-hard carbo-borides in a matrix with high hardness. Post-weld heat treatment is a relevant aspect to adjusting the final propierties of the deposit. In the present work, the microstructural evolution, phase properties and resistance to abrasive wear of a Fe-Cr-Nb-B-C-Si-Mn alloy deposited on a low carbon steel by semi-automatic welding process were studied. The samples were heat treated for 3 hours at temperatures between 500 and 900°C. They were compared with respect to the samples "as welded". The microstructure was analized by scanning electron microscopy, X-ray diffraction and transmission electron microscopy. A microstructure formed by tetragonal carboborides M2B and niobium carbides, with a microhardness of 1800 HV and 2440 HV, respectively, in a matrix formed by high hardness martensite (870 HV) was observed. The post-weld heat treatment produced the tempering of the martensite and the precipitation of secondary carbides from 500 to 800°C, producing a decrease in hardness with increasing temperature. In the specimen heat-treated at 900°C, the hardness increased at 1130 HV, reaching higher values than those obtained in the "welded" condition (940 HV), due to the formation of martensite and M23X6 carbides. A linear relationship was found between hardness and abrasive wear rate. |
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