Abstract: Effect of vacuum annealing process on microstructure and properties of the 1J50 soft magnetic alloy was studied. The results show that the magnetic properties of the 1J50 soft magnetic alloy can meet the technical requirements when the annealing temperature is 1120-1180 ℃, the holding time is 4-6 h and the rapid cooling temperature is 500-600 ℃. With the increase of annealing temperature, the permeability and saturation magnetic induction intensity of the alloy are relatively reduced. With the extension of annealing time, the permeability, maximum permeability and saturation magnetic induction intensity of the alloy are relatively increased, while the coercivity is relatively reduced, the grain size is gradually increased, and the static mechanical properties are basically unchanged. When the annealing temperature is 1160 ℃, holding for 6 h with the rapid cooling temperature at 550 ℃, the magnetic properties of the 1J50 soft magnetic alloy are good, the H_c of which is 4.81 A/m, B_s is 1.555 T, μ_0.4 is 8.81 mH/m, and μ_m is 91.60 mH/m.

Key words: 1J50 soft magnetic alloy, vacuum annealing, microstructure, property