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Pippuri-Mäkeläinen, Jenni
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Publications (9/9 displayed)
- 2024Lessons Learnt - Development Of Additive Manufacturing For Soft Magnetic Electric Motor Components
- 2023The effect of heat treatment on structure and magnetic properties of additively manufactured Fe-Co-V alloyscitations
- 2022Effect of alloying elements on Fe-Si-X soft magnetic material produced by AM and PM
- 2022Lessons learnt - additive manufacturing of iron cobalt based soft magnetic materialscitations
- 2020Structural Topology Optimization of High-Speed Permanent Magnet Machine Rotorcitations
- 2019Properties of soft magnetic Fe-Co-V alloy produced by laser powder bed fusioncitations
- 2019Properties of soft magnetic Fe-Co-V alloy produced by laser powder bed fusioncitations
- 2019Topology optimized soft magnetic cores by laser powder bed fusion
- 2018Mechanical and magnetic properties of Fe-Co-V alloy produced by Selective Laser Melting
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article
The effect of heat treatment on structure and magnetic properties of additively manufactured Fe-Co-V alloys
Abstract
In earlier research it was observed that small differences in the alloying and the processing conditions can greatly influence the microstructure and hence the magnetic performance of laser powder bed fusion (PBF-LB) processed soft magnetic Fe-Co-V material. However, a systematic study on the effect of alloy composition and heat treatments on the microstructure and magnetic properties of PBF-LB manufactured Fe-Co-V alloys is pending and the underlying mechanisms remain to be better understood. The microstructure and magnetic properties of two different Fe-Co-V alloys (with and without Nb addition) manufactured by PBF-LB with two sample types (small and large dimensions) and different heat treatments were investigated. PBF-LB processed Fe-Co-V had a fine grain structure that after annealing at 800°C and 850°C for 1, 10 and 24 h developed into a bimodal grain structure. The grain growth kinetics of the alloys varied substantially as the alloy with microalloying addition (Nb) had more homogeneous grain structure and smaller average grain size. The average grain size of specimens annealed for 24 h was approximately 210 µm (Alloy1) without and 45 µm with Nb alloying (Alloy2). Specimen size had an influence on the grain structure evolution as Alloy1 specimens with larger size had higher area fraction of large grains after annealing compared to smaller size specimens. The specimen’s surface temperature was higher for larger specimens based on in-situ thermal imaging resulting in slightly different thermal cycles between the sample types. The magnetic performance of both alloys improved with longer annealing times reaching the highest performance at 24 h anneal (Hc ~ 20 A/m and µmax ~ 15000), but the optimal annealing temperatures were different, i.e., 850°C for Alloy1 and 800°C for Alloy2.