マルエージング鋼線の機械的性質におよぼす断面減少率と時効処理条件の影響について

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  • On the Effect of Aging Temperature and Time on the Mechanical Properties of a Maraging Steel Wire
  • マルエージング コウセン ノ キカイテキ セイシツ ニ オヨボス ダンメン ゲンショウリツ ト ジコウ ショリ ジョウケン ノ エイキョウ ニ ツイテ

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This paper discribes the effect of aging temperature and time on the mechanical properties of 18%Ni-Maraging steel wires which have been drawn from a solution treated wire at original size 3.72 mm dia.to 2.5 mm dia. (54.8%,R.A; reduction of area in drawing), 2.0 mm dia. (71.2%, R.A) and finally to 0.7 mm (96.5%, R.A). Consideration is also given to the defference between as-drawn wires and aged wires (480°C×3 hr) at each draft size. The following is the summary of the results.<BR>(1) Up to 75% reduction of area in drawing, there appear no appreciable effect of work hardening. Over 75% reduction of area in drawing, rapid work hardening of the wire is noted.<BR>(2) The torsional and tensile strength of the wire after aging treatment increase with reduction of area in drawing.<BR>(3) The elastic limit ratio (τ0.03⁄τB), the yield ratio (τ0.3⁄τB) in torsion increase with reduction of area in drawing. However, the elastic limit ratio (σ0.05⁄σB), the yield ration (σ0.2⁄σB) of tension are little affected by the reduction of area in drawing.<BR>(4) Young’s modulus of both as-drawn and aged wires decreases as the reduction of area in drawing increase, while the shearing modulus is increased by higher reduction of area in drawing.<BR>(5) The elongation and torsion value gradually decrease as the reduction of area in drawing increases. The value of reduction of area of the aged wire sharply decreases at 70% reduction of area in drawing.<BR>(6) The maximum strength of the aged wire is shown at the temperature of 480°C(3 hr) regardless of the drawing history. Among them the 0.7 mm wire (96.5%,R.A) has the sharpest increase in strength.<BR>(7) The time to reach the maximum strength is 2 hr for the 2.0 mm wire (71.2%, R.A) and the 2.5 mm wire (54.8%, R.A), while 3 hr is needed for the 0.7 mm wire drawn to 96.5% reduction of area in drawing.

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