Supersolidus Sintering of Cr Prealloyed Steels by Inductive Heating

C. Gierl-Mayer 1 , M. C. Huemer 1 , H. Danninger 1 , M. Dlapka 2 , G. Stetina 2 , and R. Ratzi 3
  • 1 Institute of Chemical Technologies and Analytics, , Vienna, Austria
  • 2 , Austria
  • 3 , Laakirchen, Austria

Abstract

For powder metallurgy products, high density is an essential requirements to obtain maximum mechanical properties. Here, supersolidus liquid phase sintering (SSPLS) is an effective means to attain high sintered density, as known from PM high speed steels. In the present work it is shown that this technique can also be applied to Cr prealloyed low alloy steel grades. Supersolidus sintering through indirect heating requires precise control of temperature and also the atmosphere, to avoid uncontrolled changes of the carbon level. Higher C contents are beneficial here since they enable lower temperatures and result in wider temperature windows for sintering. The temperatures necessary for SSLPS at moderate C levels are fairly high for standard sintering furnaces, therefore induction sintering was studied in this work. It showed that, as was to be expected, also here precise temperature control is required, but for any carbon level tested a sintering temperature could be identified that yielded high sintered density and good shape retention. The high density attained, in combination with the very high temperatures, results in pronounced grain growth, this process no more being inhibited by the presence of pores, which is undesirable but can however be remedied by suitable heat treatment.

If the inline PDF is not rendering correctly, you can download the PDF file here.

  • [1] German, RM.: Sintering Theory and Practice. New York : John Wiley & Sons, Inc., 1996

  • [2] Huemer, M., Gierl-Mayer, C., Danninger, H. In: PM2014 World Congress on Powder Metallurgy & Particulate Materials. Orlando, 2014

  • [3] Schatt, W.: Sintervorgänge. Düsseldorf : VDI Verlag, 1992

  • [4] German, RM.: Int. J. Powder Metall. & Powder Technol., vol. 19, 1983, no. 4, p. 277

  • [5] Gierl-Mayer, C., Danninger, H., De Oro, R., Hryha, E. In: Advances in Powder Metallurgy and Part. Materials 2014. Proceedings of World PM Orlando, Florida May 18-22 2015. Eds. RA. Chernenkoff, WB. James, p. 05-74

  • [6] Lund, JA., Bala, SR.: Powder Metall., vol. 6, 1974, p. 409

  • [7] German, RM.: Int. J. Powder Met., vol. 26, 1990, p. 23

  • [8] Liu, J., Upadhyaya, A., German, RM.: Metallurg. & Mat. Trans. A, vol. 30A, 1999, no. 8, p. 2209

  • [9] Danninger, H., Gierl, C.: Materials Chemistry and Physics, vol. 67, 2001, no. 1-3, p. 49

  • [10] Liu, J., Lal, A., German, RM.: Acta Mat., vol. 47, 1999, no. 18, p. 4615

  • [11] Huppmann, WJ.: Int. J. Powder Metall. & Powder Technol., vol. 21, 1985, no. 3, p. 183

  • [12] Gierl-Mayer, C.: Herstellung von hochdichten PM-Präzisionsteilen durch optimierte Sinterverfahren. Ph.D Thesis. Wien : TU, 2000

  • [13] Mohammadzadeh, A., Azadbeh, M., Danninger, H.: Powder Metallurgy, vol. 58, 2015, no. 2, p. 123

  • [14] Schatt, W., Wieters, K-P., Kieback, B.: Pulvermetallurgie – Technologien und Werkstoffe, 2., bearbeitet Auflage. Berlin, Heidelberg, New York : Springer Verlag, 2007

  • [15] Upadhyaya, A., Upadhyaya, GS.: Powder Metallurgy – Science, Technology and Materials. Hyderabad, India : Universities Press, 2011

  • [16] Hermel, W., Leitner, G., Krumphold, R.: Powder Metallurgy, vol. 23, 1980, no. 3, p. 130

  • [17] Šalak, A.: Ferrous Powder Metallurgy. Cambridge : International Science Publishing, 1997

  • [18] Dlapka, M., Strobl, S., Danninger, H., Gierl, C.: Practical Metallography, vol. 47, 2010, no. 12, p. 686

OPEN ACCESS

Journal + Issues

Search