JOINED STRUCTURE OF COBALT-BASED ALLOY

Japanese Patent JP3458849

B2

PROBLEM TO BE SOLVED: To improve the corrosion resistance and wear resistance of a cobalt- based alloy part in a joined structure of a cobalt-based alloy.
SOLUTION: In the joined structure of a cobalt-based alloy, a cobalt-based alloy layer 1 where granular or aggregated eutectic carbide particles 2 are dispersed is joined to the metal of a base material 37 via an insert material layer 36. The joined structure of the cobalt-based alloy is obtained by; interposing an insert material having a thickness of about 40 μm into the space between the base material of S45C carbon steel and a cobalt-based alloy material which has a composition containing, by weight, 1.03% C, 29.73% Cr, 3.86% W, 2.59% Ni, 2.67% Fe, 0.59% Si and 0.07% Mo, and the balance substantially Co and which contains granular or aggregated eutectic carbide particles having a particle size of ≤30 μm in the base part of a cast structure; and performing liquid phase diffusion joining at 1,100°C for a holding time of 1 hr. The cobalt-based alloy layer 1 after the joining contains granular or aggregated eutectic carbides.

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Yoshihisa Kiyotoki
Mitsuo Chikazaki
Shizuo Matsushita
Jiro Kuniya
Takahiko Kato
Yoshiteru Chiba

JP2001235707A

October 20, 2003

August 03, 2001

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株式会社日立製作所

G21D1/00; B23K20/00; B23K35/30; C22C19/07; F16K25/00; G21D1/02; B23K103/08; (IPC1-7): B23K20/00; C22C19/07; F16K25/00; G21D1/00

JP2002146486A
JP2001288521A
JP200248264A
JP2001281394A
JP200328315A

Yasuo Sakuta

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