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Development of Improved Cutting Tool Materials

Report Number: ASD TDR 7-714 Volume 1
Author: Holtz, F. C.
Corporate Author: Armour Research Foundation
Corporate Report Number: ARF-B6000-3
Date of Publication: 1963-01
Pages: 27
Contract: AF 33(657)8786
AD Number: AD0294621
Original AD Number: AD-294 621

Experimental work has involved the preparation and initial evaluation of a wide range of cutting tool materials produced by a variety of techniques. An M2 high-speed steel base was enriched in vanadium, then forged into bar stock. Material containing up to 18wt% vanadium was fabricable, but none of the vanadium-enriched compositions were heat treatable without subsequent enrichment in carbon by solid-state surface carborization. This procedure should result in a tool material having a tough core with a hard, high-carbon surface layer. The casting of an M1 high-speed steel into an oscillating mold produced a much finer distribution of carbides than similar material cast into stationary mold. Initial atomization experiments using an M2 high-speed steel produced partially spheroidized particles generally finer than 80 mesh. No massive carbides were observed in the microstructures. Studies of liquid-phase sintered carbides included 2 general work areas. The first, utilizing iron-, nickel-, or cobalt-containing matrix phases, was concerned with the development of fine spheroidized carbides, principally VC. The second work area involved wettability and sintering studies of various carbides with high-melting matrix phases.

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