Authors
MSKKY Nartu, S Dasari, A Sharma, V Chaudhary, SM Varahabhatla, SA Mantri, E Ivanov, RV Ramanujan, NB Dahotre, R Banerjee
Publication date
2021/4/25
Journal
Journal of Alloys and Compounds
Volume
861
Pages
157998
Publisher
Elsevier
Description
While BCC Fe–Co alloys form an important class of soft magnetic alloys, they are often challenging to process in near net shape, due to the formation of the hard embrittling ordered B2 phase. Additive manufacturing (AM) technologies, such as laser engineered net shaping (LENS), permit processing these alloys in complex near-net shapes while controlling the extent of B2 ordering. The as-deposited samples, consist of elongated BCC grains, and exhibited reasonable values of saturation magnetization (Ms) but rather high coercivity (Hc). After annealing (950 °C/30 min), the Hc values further increased due to the formation of fine recrystallized BCC grains, although these grains were relatively free of residual stresses. A second annealing step (500 °C/50 h) resulted in the Ms increasing by 25% and Hc reducing by 63%. Detailed Transmission Electron Microscopy (TEM) analysis revealed substantially larger ordered …
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