Advertisement

Development of Dispersion-Hardened Cobalt-Base Cutting-Tool Alloys from Atomized Powders

  • O. W. Reen

Abstract

The atomizing process for manufacturing prealloyed powders has been used for the preparation of extremely fine dispersions in metal matrices. Using this process, fine hard carbides of titanium and columbium were produced in transition-metal matrices. As these carbides exhibited stability over wide temperature ranges, excellent base materials for cutting-tool compositions were provided. Of these, the cobalt-base alloys appeared most attractive. Cobalt-base compositions containing at least 30% of carbide formers, such as titanium, columbium, tungsten, molybdenum, and chromium, with carbon, were prepared as atomized powders. These powders were consolidated by extrusion into high-density bars with hardnesses approaching Rockwell 70C. Tools prepared from the extruded powders were evaluated in turning tests. At a hardness of Rockwell 61C., tools prepared from powders performed significantly better than conventional tool steel alloys and were comparable to a commercial cast tool in the machining of an austenitic stainless steel grade. At higher hardnesses of approximately Rockwell 70C., tools prepared from the extruded powder had a life of two to three times the life of a cast tool composition in the machining of a heat-treated SAE 4340 test log.

Keywords

Tool Life Titanium Carbide Atomize Powder Prealloyed Powder Cast Tool 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    Towner, R. J., “Atomized Powder Alloys of Aluminum,” Metal Progr. 73: 70–76, 176, 178 (1958).Google Scholar
  2. 2.
    Edwards, R., and T. Raine, “The Solid Solubilities of Some Stable Carbides in Cobalt, Nickel, and Iron at 1250°C.,” Plansee Proc. 1st Seminar, Reutte/Tyrol, 1952, 232–243 (1953).Google Scholar
  3. 3.
    Holtz, F. C., Development of Improved Cutting Tool Materials, Report IR-7–714 (VI), ASD Project No. 7–714, Interim Engineering Progress Report, under U.S. Government Contract AF 33(657)-8786 by IIT Research Institute, Chicago, Jan. 25, 1964-April 24, 1964, pp. 18–28.Google Scholar

Copyright information

© Springer Science+Business Media New York 1966

Authors and Affiliations

  • O. W. Reen
    • 1
  1. 1.Allegheny Ludlum Steel CorporationBrackenridgeUSA

Personalised recommendations