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US 5,290,507 AGranted
Method for making tool steel with high thermal fatigue resistance
OwnerJoseph C. Runkleinventor
Life of this patent
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Abstract
Method of forming and a new class of tool steel macrocomposites having improved thermal fatigue resistance and improved wear resistance, formed of tool steel powder mixed with carbide powder under hot isostatic pressing.
Claims25
A process for forming a macrocomposite having improved thermal fatigue resistance comprising the steps of
- (a) mixing a tool steel microcomposite alloy powder and a carbide microcomposite powder to form a powder mass in a manner that said powders are generally well distributed in said mass, said carbide microcomposite powder being formed of particles from about 25-100 micrometers in diameter, and
- (b) hermetically sealing and heating said mass isostatically to a temperature of at least 1100 C, at at least 2-3000 psi, until said mass is diffusion bonded into a macrocomposite having (i) a tool steel matrix, formed from said tool steel microcomposite powder, and (ii) carbide islands, formed from said carbide microcomposite powder dispersed in said matrix.
Dependencies are inferred from the claim text.