Accession Number : ADA019750

Title :   Exploratory Development of Improved Cutting Tools for Titanium.

Descriptive Note : Final rept. 1 Apr 71-5 Dec 74,

Corporate Author : OREGON GRADUATE CENTER BEAVERTON DEPT OF MATERIALS SCIENCE

Personal Author(s) : Rudy,E.

Report Date : JUN 1975

Pagination or Media Count : 122

Abstract : Substoichiometric WC-Ni sintered carbide cutting tools, optionally doped with small quantities of selected carbonitrides and carbides for grain size control, show significantly improved resistance to localized crater wear over conventional C-2 and C-3 grade carbides in turning Ti6Al4V alloy, at about equivalent flank wear resistance. The best performing alloys are those with a dual grain structure of respectively, 1 to 2 micrometers and 6 to 10 micrometers tungsten carbide, binder contents between 16 and 9 percent by weight, and carbon deficiencies corresponding closely to the borderline of eta-carbide formation. The alloys can be prepared substoichiometric in bulk or by controlled surface depletion of carbon by exposure to reducing atmospheres. Improvements achieved with cobalt-bonded tools of similar stoichiometries were less than with the nickel-bonded tools.

Descriptors :   *CARBIDE TOOLS, TITANIUM ALLOYS, SINTERING, TUNGSTEN CARBIDES, BINDERS, NICKEL, CUTTING TOOLS, WEAR RESISTANCE

Subject Categories : Machinery and Tools

Distribution Statement : APPROVED FOR PUBLIC RELEASE