不銹鋼線の加工および焼鈍による剛性率，内部摩擦などの変化について

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  • The Effect of Cold-Drawing and Annealing on the Rigidity Modulus and Internal Friction in Stainless Steel Wires
  • フシュウコウセン ノ カコウ オヨビ ショウドン ニ ヨル ゴウセイリツ , ナイブ マサツ ナド ノ ヘンカ ニ ツイテ

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The changes of the rigidity modulus, the electrical resistivity, the hardness and the internal friction due to cold drawing and annealing were measured in 13Cr- and 18-8 stainless steel wires. The measurements were made on specimens of 0.7 or 0.6 mm diameter, using a torsion pendulum, a potentiometer and a micro-Vicker’s hardness tester. The results obtained were as follow: (1) The rigidity modulus of 13Cr stainless steel wire decreased slightly by the cold drawing above 30% in area reduction. (2) The internal friction of 13Cr stainless steel wire decreased remarkably by cold drawing of less than 10% reduction in area, but gradually increases by the drawing above 10% reduction. (3) The internal friction of 18-8 stainless steel wire increased remarkably with the amount of cold drawing less than 3% in reduction in area, but gradually increased by the drawing above 3% reduction. (4) The rigidity modulus of 13Cr- and 18-8 stainless steel wire increased slightly by annealing at a temperature higher than 150°. (5) The internal friction of 13Cr stainless steel wire decreased remarkably by annealing at 100∼300° after cold drawing, but increased at 400∼650°. (6) The internal friction of 18-8 stainless steel wires cold-drawn less than 22% in reduction in area decreased gradually by annealing at 100∼650°, but that of the wires cold drawn more than 49% in reduction decreased remarkably by annealing at 100∼250°, and increased by annealing at 550∼650°.

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