The Development of Nanocrystalline CBN for Enhanced Superalloy Grinding Performance

[+] Author and Article Information
Y. Ichida, K. Kishi

Department of Mechanical Systems Engineering, Utsunomiya University, 2753 Ishii, Utsunomiya, 321 Japan

J. Manuf. Sci. Eng 119(1), 110-117 (Feb 01, 1997) (8 pages) doi:10.1115/1.2836547 History: Received June 01, 1995; Revised October 01, 1995; Online January 17, 2008


CBN grinding wheels are increasingly used on a wide range of engineering materials. This paper compares the grinding performance of monocrystalline (M-CBN) and polycrystalline (P-CBN) abrasives with a newly developed nanocrystalline (N-CBN) abrasive, when grinding nickel-based superalloys. The N-CBN grits possess average crystal grain diameters less than 1 μm compared to average primary grain diameters of 2.3 μm for P-CBN. It was found that the nanocrystalline CBN grits possess higher fracture strength which give reduced wear rates and yield an order of magnitude increase in grinding wheel life. Analysis of the cutting edge distribution shows that the reduced wear rate of N-CBN is due to the predominance of a micro-fracturing mode of abrasive wear. The size of this micro-fracturing is considerably smaller in N-CBN than in P-CBN.

Copyright © 1997 by The American Society of Mechanical Engineers
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