Cu–Ni–Si合金の深絞り加工性に及ぼす結晶方位の影響

抄録

The effect of crystal orientation on Lankford value and drawability in Cu–Ni–Si alloy was investigated. The specimens with a crystal orientation aligned with the BR orientation {362} <853>, R orientation {123} <634>, Cube orientation {001}<100> and RDW {012}<100> were prepared from Cu–2.5wt%Ni–0.6wt%Si alloy ingot by hot rolling, cold rolling, and heat treatment. The average Lankford value was higher in the order of R orientation, BR orientation, RDW orientation and Cube orientation. The drawability was investigated by drawing blanks with diameters of 30.0, 35.0, 42.5 and 45.0 mm using a punch with a diameter of 20.0 mm. The limiting drawing ratio was higher in the order of R orientation, BR orientation = RDW orientation and Cube orientation, and a positive correlation with the Lankford value was observed. The R–oriented material showed higher drawability than C2680R–H which has been often used for drawing.