日本金属学会誌

J. Japan Inst. Metals, Vol. 63, No. 3 (1999),
pp. 305-311

Texture and r-values of Cu/18Cr-8Ni-Fe/Ni Clad Metal

Masaaki Ishio1, Masakazu Umeda1,Hirofumi Inoue2 and Kenji Morii2

1Sumitomo Special Metals Co., Ltd., Minamisuita 2-19-1, Suita 564-0043
2College of Engineering, Osaka Prefecture University, Sakai 599-8231

Abstract:

As a practical material for use as the anode cases of button-type batteries, we have studied clad metals consisting of Cu/18Cr-8Ni-Fe(SUS304)/Ni, and shown the possibility of improvement in strength and anisotropy by annealing and cold rolling. From the comparison of the clad metals and SUS304 plates about texture or r-values, we have obtained the following results:
(1) The clad metals showed higher strength and formability, by 25% cold rolling after annealing. Tensile strength increased from 657 MPa to 862 MPa, and the Δ{r}-values reduced from 0.25 to 0.08. This is because the texture of the 18Cr-8Ni-Fe core material in clad metal has a rather wide spread in orientation, when compared with that of the SUS304 plates, and the formation of Goss orientation {110}<{001}> during cold rolling, which leads to a remarkable anisotropy, is largely suppressed.

(2) The in-plane anisotropy of r-values was calculated from an orientation distribution function based on the Taylor theory. It agreed well, qualitatively, with that of measured r-values in both of the clad metals and SUS304 plates.

(3) For the clad metals, the core material is deformed without direct contact with the rolls. Therefore, the characteristic texture formation in clad metal may be caused by the suppression of shear deformation.


(Received September 22, 1998; In Final Form November 13, 1998)

Keywords:

copper/18%chromium-8%nickel stainless steel/nickel clad metal, SUS304, button-type battery, anisotropy, texture, r-value, orientation distribution function, Taylor theory


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