| About this Abstract |
| Meeting |
MS&T23: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing of Metals: Microstructure, Properties and Alloy Development
|
| Presentation Title |
On the Origin of Cracking in Laser Powder Bed Fusion Processed LaCe(Fe,Mn,Si)13, and the Impact of Post-Processing |
| Author(s) |
Kun Sun, Moataz Attallah |
| On-Site Speaker (Planned) |
Kun Sun |
| Abstract Scope |
The LaCe(Fe,Mn,Si)13 magnetocaloric material printed by laser powder bed fusion has huge potential for magnetic refrigeration. However, the high crack and defect susceptibility during the LPBF processing remain limitations for its application. This study optimised the LPBF process parameters for optimally-dense blocks. The behaviour and mechanism of different cracks and defects were revealed. The lower energy density, caused by the higher scanning speed and hatch space, can cause a lack of fusion defects. The solidification cracking is attributable to the stress concentration and a stable liquid film. The solid-state cracks are normal in the microstructure of the as-fabricated sample due to the poor toughness of the La/Ce/Si-rich phases. Thermal heat treatment and quenching increased the magnetocaloric effect of the AF sample. The Curie temperature (298 K) and good MCE make the material ideal for realising room-temperature magnetic refrigeration. |