| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Additive Manufacturing of Metals: Complex Microstructures and Architecture Design
|
| Presentation Title |
Cracking in Additively Manufactured Refractory Metals |
| Author(s) |
Elizabeth Ellis, Yousub Lee, Michael Kirka |
| On-Site Speaker (Planned) |
Elizabeth Ellis |
| Abstract Scope |
Additive manufacturing of refractory metals is an area of growing interest and may open new design avenues in energy production technologies such as nuclear fission and fusion. However, refractory metals such as tungsten and molybdenum are difficult to process using additive techniques due to their high melting point, high thermal conductivity, and brittle nature. While previous work has shown that it is possible to produce fully dense material via additive manufacturing by careful control of process parameters, cracking has proven more difficult to eliminate. In this work, molybdenum is used as a model material to explore cracking behavior in powder bed fusion of refractory metals, with a special focus on electron beam melting. Cracking mechanisms are summarized, and process-structure-property relations exploring the effects of build parameters on cracking behavior are presented. Recommendations for crack reduction in additively manufactured refractory metals are given. |