A new-type of cermets cutter with nano-TiN addition: Microstructure mechanical and cutting properties

Abstract

The microstructure and mechanical properties of a new-type of cermets cutter (tool A) with nano-TiN modification and its cutting properties in cutting gray cast iron are investigated. SEM and TEM observations of the microstructure of the above material reveal that nano-TiN modified cermets possess a finer microstructure than conventional cermets. In the cutting tests, for comparison, cemented carbide cutter (YG8, tool B) was also utilized. The cutting results show that the cutting properties of tool A are superior to those of tool B. It is also found that the predominant failure mode of tool A is normal wear and micro-spoiling under lower cutting quantities, and that chipping occurs under higher cutting quantities. SEM analysis reveals that cohesion, oxidation and diffusion wear become very apparent at a higher cutting speed. On the contrary, grain wear also exists but is not apparent.

Keywords

microstructure / cermets / nano-TiN additions / cutting properties / failure mode

References

[1] Doi H. Advanced TiC and TiC-TiN Based Cermets.2nd Int. Conf. Science Hard Materials, 1984 England: Adam Hilger Ltd. 489-523.

[2] Ettmayer P. Hardmetals and Cermets. Anu. Rev. Mater. Sci., 1989, 19: 145-164.

[3] Ettmayer P, Lengauer W. The story of Cermets. Powder Met-all. Int., 1989, 21(2): 37-38.

[4] Ettmayer P, Kolasks H, Lengauer W, . Ti(C,N) Cermets-metallurgy and Properties. Int. J. Refr. Metals & Hard Ma-ter., 1995, 13: 343-351.

[5] Humenik M, Parikh N M Jr. Cermets: I, Fundamental Con-cepts Related to Microstructure and Physical Properties of Cermets Systems. J. Am. Ceram. Soc., 1956, 39: 60-63.

[6] Stearns L C, Zhao J, Harmmar M P. Processing and Micro-structure Development in Al₂O₃-SiC Nanocomposites. J. Eu-ro. Ceram. Soc., 1992, 10(6): 473-477.

[7] Li Z H. Research on the Properties of Nano-TiN Modified TiC Based Cermets and Their Cutters. J. Hefei University of Tech-nology, 2002, 24: 71-72.

[8] Liu N, Xu Y D, li H, Li G H, Zhang L D. Effect of Nano-micro TiN Addition on the Microstructure and Mechanical Properties of TiC Based Cermets. J. Euro. Ceram. Soc., 2002, 22(13): 2409-2414.

[9] Ahn S Y, Kang S. Formation of Core/rim Structures in Ti(C, N)-WC-Ni Cermets via a Dissolution and Precipitation Pro-cess. J. Am. Ceram. Soc., 2000, 83(6): 1489-1494.

[10] Editorial Committee for Contemporary Practical Handbook for Index Cutters Contemporary Practical Handbook for Index Cutters, 1994 Beijing: Mechanical Industry Press. 35-36.

[11] Okuyama K, Sakuma T. High Temperature Plastic Flow in TiC-20 wt% Mo₂G-20 wt% Ni Cermet. Mater. Sci. Eng., 1995, A194: 63-68.

[12] Campbell P Q, Celis J P, Roos J R. Fretting Wear of Selected Ceramics and Cermets. Wear, 1994, 174: 47-56.