Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7989751 | International Journal of Refractory Metals and Hard Materials | 2018 | 35 Pages |
Abstract
Sintering behavior of nanoscale WC-Co was investigated based on master sintering curve model. Densification and grain growth were mapped for grain size assessment and optimization. Parameters for model fitting were acquired by experimental approaches. Using the sensitivity analysis with respect to processing parameters, effects of key conditions on final properties were investigated. Based on the derived objective function, an optimization algorithm to minimize grain size under the given target density was developed. For example using our nanoscale WC-Co, grain size of 332Â nm was the minimum size when the compaction pressure of 565Â MPa and 97% of sintered density were the processing constraints. Using the constructed mapping function, the achievable minimum grain size under constrained processing condition is predicted and the further requirements for the powder are suggested to achieve the specific target grain size. In this study, we use the master sintering curve model and optimization methods to identify process conditions, such as compaction pressure and sintering temperature, to tailor specified tolerances of the fabricated components.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Jun Sae Han, Sangyul Ha, John L. Johnson, Randall M. German, Seong Jin Park,