Materials Transactions Online

Materials Transactions, Vol.59 No.05 (2018) pp.754-759
© 2018 Japan Society of Powder and Powder Metallurgy

Lifetime in Steel Cord Wire Drawing Dies of WC-Co Cemented Carbide Containing TaNbC or Cr3C2

Masayuki Takada1, 2, Hideaki Matsubara2, 3 and Yoshihiro Kawagishi1

1Nippon Tokushu Goukin Co. Ltd., Gamagori 443-0011, Japan
2Department of Environmental Studies, Tohoku University, Sendai 980-8579, Japan
3Japan Fine Ceramics Center, Nagoya 456-8587, Japan

Wire-drawing dies and specimens of WC-Co cemented carbides containing TaNbC or Cr3C2 were fabricated by hot isostatic pressing (HIP) at 1633 K in 40 MPa Ar and by annealing at 1593 K in vacuum. The lifetimes of steel cord wire-drawing dies were evaluated and their mechanical properties such as hardness, transverse rupture strength, and fracture toughness were examined. The lifetime of the drawing die was noted to have remarkably improved by annealing for WC-Co cemented carbides containing both TaNbC and Cr3C2. The alloys containing TaNbC had longer lifetimes than those containing Cr3C2. The lifetime of a drawing die was weakly related to its hardness but appeared to have no correlation with its strength or toughness. The remarkable improvement in the drawing die lifetime resulting from annealing treatment after HIP and the longer lifetime of TaNbC-containing alloys can be understood in terms of the adhesion strength between the WC and Co phases being affected by the alloy content and heat treatment of cemented carbides.


(Received 2017/12/26; Accepted 2018/02/19; Published 2018/04/25)

Keywords: cemented carbide, HIP, anneal, drawing die, steel cord wire

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