POWDER METALLURGY, COBALT-BASED ARTICLES HAVING HIGH RESISTANCE TO WEAR AND CORROSION IN SEMI-SOLID METALS

摘要

A fully dense powder metal cobalt-base article having high resistance to semisolid metal wear and corrosion. The article has a constituent composition of C in an amount of about 0.65 to less than about 1 %, W in an amount of about 3 to about 5 %, Cr in an amount of about 25 to about 30 %, Co in an amount principally comprising the balance of the article. The article has a hardness of greater than 42HRC and more preferably 45HRC, a bend fracture strength of greater than 330 ksi and substantial dimensional and mechanical property stability during exposure to temperatures in range of about 1100 ~F to 1500 ~F.