Cemented carbide with a hardenable binder phase

Details Cemented carbide with a hardenable binder phase Cemented carbide with a hardenable binder phase

2000-01-19

2001-07-10

Mai, Ngoclan (Department: 1742)

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

C419S018000, C419S025000, C419S026000, C419S028000, C419S029000, C419S035000, C419S038000

Reexamination Certificate

active

06258147

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a material based on a hardenable binder phase in a submicron WC-based cemented carbide.
It is desirable to develop cutting tool materials with a high wear resistance compared to high speed steel and tougher than cemented carbide. One example of such a material is U.S. Pat. No. 3,658,604, which discloses material containing 15-75 wt-% WC in a matrix of Co and Fe with a ratio Co to Fe of 0.65 to 2.0. Another example is U.S. Pat. No. 4,145,213 which discloses 30-70 vol-% submicron hard constituents in a matrix of high-speed steel type.
OBJECTS AND SUMMARY OF THE INVENTION
It is an object of this invention to avoid or alleviate the problems of the prior art.
It is further an object of this invention to provide a hard material based on submicron WC in a hardenable binder phase.
It is yet further an object of this invention to provide a material with a balanced binder phase composition and hardening temperature. An efficient precipitation of secondary carbides requires a good balance between carbide formers and carbon dissolved in the hardened binder phase.
In one aspect of the invention there is provided a cemented carbide consisting of 50 to 90 wt-% submicron WC in a hardenable binder phase wherein said binder phase comprises, in addition to Fe, 10-60 wt-% Co, <10 wt-% Ni, 0.2-0.8 wt-% C, Cr, W, Mo and/or V in amounts satisfying the relations
2
x
C
<x
W
+x
Cr
+x
Mo
+x
V
<2.5
x
C
where x denotes mol fraction elements in the binder phase and the following relation for the total Cr content
0.03<wt-% Cr/(100-wt-% WC)<0.05
In another aspect of the invention there is provided a method of making a cemented carbide consisting of 50 to 90 wt-% submicron WC in a hardenable binder phase by powder metallurgical methods, milling, pressing and sintering of powders forming hard constituents and binder phase wherein
said binder phase comprises, in addition to Fe, 10-60 wt-% Co, <10 wt-% Ni, 0.2-0.8 wt-% C, Cr, W, Mo and/or V in amounts satisfying the relations
2
x
C
<x
W
+x
Cr
+x
Mo
+x
V
<2.5
x
C
where x denotes mol fraction elements in the binder phase and the following relation for the total Cr content
0.03<wt-% Cr/(100-wt-% WC)<0.05
sintering is performed in the temperature range 1230-1350° C. and the sintered cemented carbide is solution treated at 1000-1150° C. for about 15 min in a protective atmosphere, force cooled from the solution temperature, heat treated one or more times at 500-650° C. for about 1 h followed by forced cooling.


REFERENCES:
patent: 3658604 (1972-04-01), Hale
patent: 4145213 (1979-03-01), Oskarsson et al.
patent: 5841045 (1998-11-01), McCandlish et al.
patent: 6024776 (2000-02-01), Heinrich et al.
patent: 6086650 (2000-07-01), Carpenter
patent: 1 558 494 (1972-03-01), None
patent: 61-096072 (1986-05-01), None
patent: 6-033183 (1994-02-01), None

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