Fe-Si-Al系合金の耐チッピング性と組織との関係
1994 年 58 巻 1 号 p. 55-61
詳細
1994 年 58 巻 1 号 p. 55-61
Cast Fe-Si-Al alloys containing 0.5%Ti, 0∼0.06%C, 0.2%rare earth metal, were prepared using a 10-kg vaccum induction furnace. Fe-Si-Al alloy cores for magnetic recording head were produced by grinding from those alloys which were hot-rolled and annealed at 900∼1100°C. In this paper, the effect of grain size on chipping resistance in rough cutting, groove grinding and fine cutting of head-cores process is studied. The results obtained are as follows. \ding”C0 The methods to obtain a fine grain size of Fe-Si-Al alloy are “hot-rolling” and “adding the minimum quantity of inhibiting grain-growth elements C, Ti, M. M. to alloy”. The former is the best method to obtain alloys with fine grains. \ding”C1 The larger the grain size in Fe-Si-Al alloys, the more the number of chips increases. \ding”C2 Both the depth and the number of chips are larger in cast alloys than hot-rolled and annealed alloys. \ding”C3 Alloys with fine grains are obtained by the adding two elements (Ti & C) to alloys rather than adding one element (Ti or C).
