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| Title: | Sinterbonding cobalt-cemented tungsten carbide to tungsten heavy alloys |
| Author (s): | Rodelas, Jeff Hilmas, Greg Mishra, Rajiv S. |
| Department/Lab Affiliations: | Center for Aerospace Manufacturing Technologies Center for Friction Stir Processing Energy Research and Development Center Intelligent Systems Center Materials Research Center Materials Science & Engineering |
| Keywords: | friction stir welding tools sinterbonding tungsten carbide tungsten heavy alloy η-Carbide |
| Issue Date: | 2009-09 |
| Publisher: | Elsevier |
| Abstract: | Cobalt-cemented tungsten carbide (WC-Co) powder was sinterbonded to nickel-iron tungsten heavy alloy (WHA) for use in high-temperature tooling applications. Sinterbonding was performed under various conditions, including changes to the sintering conditions and initial WHA material forms, to determine various processing conditions that yield a consolidated interface indicative of a high degree of bonding. Sinterbonding WC-Co to fully dense WHA bar stock yielded a consolidated interface comprised primarily of complex η-carbides. Defects at the interface, including voids, microcracking, and porosity were the result of other sinterbonding processing conditions explored in this work. Co-rich η-carbides were found to form at the interface in every condition examined. A thermodynamic evaluation of η-carbides as a function of carbon activity determined that Co-rich η-carbides formed preferentially in regions of low carbon activity. The predicted thermodynamic trends are in agreement with interfacial microstructural observations. |
| Print Status: | Postprint |
| Type: | Article - Journal text |
| In Title: | International Journal of Refractory Metals and Hard Materials. |
| Copyright Notice: | This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder. Pre-print: author can archive; Post-print: author can archive; FULL COPYRIGHT INFORMATION: |
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| title | Sinterbonding cobalt-cemented tungsten carbide to tungsten heavy alloys |
| contributor.author | Rodelas, Jeff |
| contributor.author | Hilmas, Greg |
| contributor.author | Mishra, Rajiv S. |
| contributor.deptlab | Center for Aerospace Manufacturing Technologies |
| contributor.deptlab | Center for Friction Stir Processing |
| contributor.deptlab | Energy Research and Development Center |
| contributor.deptlab | Intelligent Systems Center |
| contributor.deptlab | Materials Research Center |
| contributor.deptlab | Materials Science & Engineering |
| contributor.sponsor | Missouri S&T Intelligent Systems Center |
| subject | friction stir welding tools |
| subject | sinterbonding |
| subject | tungsten carbide |
| subject | tungsten heavy alloy |
| subject | η-Carbide |
| date.issued | 2009-09 |
| publisher | Elsevier |
| identifier.citation | Rodelas, J., Hilmas, G., and Mishra, R.S. "Sinterbonding cobalt-cemented tungsten carbide to tungsten heavy alloys", International Journal of Refractory Metals and Hard Materials, vol. 27, issue 5, 2009, pp. 835-841. |
| identifier.pub.URI | |
| description.abstract | Cobalt-cemented tungsten carbide (WC-Co) powder was sinterbonded to nickel-iron tungsten heavy alloy (WHA) for use in high-temperature tooling applications. Sinterbonding was performed under various conditions, including changes to the sintering conditions and initial WHA material forms, to determine various processing conditions that yield a consolidated interface indicative of a high degree of bonding. Sinterbonding WC-Co to fully dense WHA bar stock yielded a consolidated interface comprised primarily of complex η-carbides. Defects at the interface, including voids, microcracking, and porosity were the result of other sinterbonding processing conditions explored in this work. Co-rich η-carbides were found to form at the interface in every condition examined. A thermodynamic evaluation of η-carbides as a function of carbon activity determined that Co-rich η-carbides formed preferentially in regions of low carbon activity. The predicted thermodynamic trends are in agreement with interfacial microstructural observations. |
| type | Article - Journal |
| type.DCMIType | text |
| type.status | Postprint |
| relation.isPartOf | International Journal of Refractory Metals and Hard Materials. |
| rights | This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder. |
| rights | Pre-print: author can archive; Post-print: author can archive; |
| rights.URI | |
| identifier.persist.URI | |
| date.available | 2011-04-22T16:21:31Z |