Process for making a metallic article with improved resistance t

Details Process for making a metallic article with improved resistance t Process for making a metallic article with improved resistance t

1988-09-01

1989-11-28

Yee, Deborah

Metal treatment

Compositions

Heat treating

148 12E, 148902, C22C 806

Patent

active

048835455

ABSTRACT:
A process for improving the cold workability of a metallic article is disclosed. The process includes compressive working followed by heat treatment of a metallic article to provide a duplex microstructure including relatively fine grains near the surface and relatively coarse grains near the center of the article. The duplex microstructure improves the surface cracking resistance of the article during subsequent compressive cold forming, such as by cold heading.

REFERENCES:
J. K. Lee et al., An Analysis for the Effect of a Grain Size Gradient on Torsional and Tensile Properties, 19A Metallurgical Transactions A (Feb. 1988).
C. L. Girolami et al., Effects of Cold Bar Drawing on Workability in Subsequent Upsetting, Conf. Proceedings 12 NAMRC (1984).
D. K. Matlock & D. A. Burford, An Experimental Correlation of Plane Strain Deformation Zone Geometry and Forming Loads, Jour. of Applied Metalworking, vol. 4, No. 4 (Jan. 1987).
W. A. Backofen, Deformation Processing, pp. 88-106 & 135-139, Addison-Wesley (1972).
EPO Patent Application Publ. No. 0218167, Takahashi and Asano (Apr. 15, 1987).
J. L. Tevaarwerk et al., The Influence of Prior Cold Working and the Consideration of Die Design on the Cold Headability of 1020 Steel Wire Using an Instrumented Double Blow Heading Machine, Z. Metallkunde, Bd. 63 (1972).
M. Kojima and Y. Tozawa, Anisotropic Behaviour of Pre-Drawn Materials in Upsetting-Study on Upsetting of Pre-Deformed Material III, Jour. of Jap. Soc. Technology, vol. 13, No. 133 (1972).
F. Gill & W. M. Baldwin, Jr., Proper Wiredrawing Improves Cold Heading, Metal Progress (Feb. 1964).

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