Blade member of tungsten-carbide-based cemented carbide for cutting tools and process for producing same
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United States of America Patent
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Apr 21, 1992
Grant Date -
N/A
app pub date -
Oct 31, 1989
filing date -
Oct 31, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A blade member of tungsten carbide based cemented carbide for cutting tools has a tungsten carbide based cemented carbide substrate having a hard phase, a binder phase and unavoidable impurities. The hard phase has 5% to 60% by weight of one or more of carbide and carbo-nitride of titanium, tantalum and tungsten, and carbide and carbonitride of titanium, tantalum, niobium and tungsten. The binder phase has 3% to 10% by weight of cobalt and a balance tungsten carbide. The substrate has a surface softening layer having a cobalt-pool phase and an interior portion. The surface softening layer has an outermost region in which hardness is generally constant with respect to depth from the substrate surface and an inner region in which hardness rises inwardly of the substrate up to the hardness of the interior portion. There is also disclosed a process for producing the above-mentioned blade member.
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