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Effects of composition and processing variables on transverse rupture strength and hardness of nickel-alloy-bonded titanium carbide.

Fisher-GT II
MISSING :25 pages
The material requirements of carbide cutting tools for machining steel and cast iron are dependent on tungsten carbide (wc) bonded with CO, with additions of tac and tic. The Bureau of Mines is conducting research to devise substitute materials, based on ni- alloy-bonded tic, for c-5-grade cutting tool applications. This substitution would result in less dependence on foreign sources for CO, ta, and w, and use of lower cost materials. In this preliminary study, the Bureau investigated the effects of composition and processing variables on the transverse rupture strength and hardness of ni-alloy-bonded tic to identify compositions that exhibit promising mechanical properties. Further systematic modification of these compositions by solid-solution strengthening additions would subsequently be evaluated to obtain cutting tool materials with requisite properties and performance for c-5 applications. Compositions for evaluation were prepared by a powder metallurgy method of cold-pressing and liquid-phase sintering. Complementary analysis of compositions included chemical analysis, x-ray diffraction, energy-dispersive x-ray spectroscopy, and density measurements. Based on results of this investigation, promising compositions were determined to be 59.37Tic-25ni-5mo-10.63Mo2c, 59.68Tic-25ni-3.33Mo-1.77Mo2c-6.67W-3.55Wc, and 59.35Tic-25ni-1.67Mo- 3.54Mo2c-3.33W-7.1Wc.
Publication Date
Document Type
IH; Report of Investigations;
Fiscal Year
Identifying No.
RI 9115
NIOSH Division
Source Name
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division