J044042 急冷遠心鋳造で作製したトルクセンサ用Fe_<49>Co_<49>V_2磁歪合金の特性([J04404]知的材料・構造システム(4))

概要

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For an application of the magnetostrictive alloy to the ring-type torque sensor, it is necessary that the alloy exhibits large magnetostriction, large coercive force and high strength. We previously developed magnetostrictive Fe_<49>Co_<496gt;V_[at%] alloys by copper mold casting method which exhibited good magnetic property and high torque sensitivity (>1.0[G/Nm]), however, their strengths were lower (450[MPa]) than required strength (800[MPa]). The purpose of this study is improvement in strength due to grain refinement by rapid cooling due to applying the rapid-solidification centrifugal casting method. After centrifugal casting, magnetostrictive rings were heat treated to removal of internal stress applied during rapid cooling process. The annealing temperature and time were 650℃, 850℃ for 3 hours to the ring-sample. Result of each measurements, we obtained the centrifugal casted rings which exhibits the values of torque sensitivity, 0.987[G/Nm] and bending strength, 857[MPa].
一般社団法人日本機械学会の論文
2011-09-11