As-sintered AISI 440C stainless steels with improved hardness and corrosion resistance

Ovri, H.; Ohaukwu, C.J.; Bahadirov, K.; Larson, M.; Kjeldsteen, P.

Journalpaper

As-sintered AISI 440C stainless steels with improved hardness and corrosion resistance

Abstract

Preliminary work on powder metallurgy (PM) AISI 440C steel with 1.2 w/o C indicated that it is possible to achieve acceptable hardness in the as-sintered condition, but with inferior corrosion resistance. To address this limitation, a series of simulations were carried out using Thermocalc software to predict alloy compositions and sintering temperatures for achieving optimum properties. The simulations served as the basis for the design of a Taguchi trial run with an L9 orthogonal array. Test samples were characterized utilizing microindentation hardness and salt-spray-corrosion testing. Microstructural analysis was also used to characterize and interpret the observed behavior. The results show that AISI 440C with 0.95 w/o C and 200 ppm B sintered at 1,220°C gives an optimum combination of the assintered roperties.

URL: https://publications.hereon.de/id/32570/
Authors:Ovri, H., Ohaukwu, C.J., Bahadirov, K., Larson, M., Kjeldsteen, P.
Year:2010
In: International Journal of Powder Metallurgy
Volume:46
Issue:6
Pages:43 - 50
Publisher:AMPI - American Powder Metallurgy Institute , Princeton, NJ
Type:Journalpaper
ISSN: 0888-7462
Cite as: Ovri, H.; Ohaukwu, C.J.; Bahadirov, K.; Larson, M.; Kjeldsteen, P.: As-sintered AISI 440C stainless steels with improved hardness and corrosion resistance. In: International Journal of Powder Metallurgy. Vol. 46 (2010) 6, 43 - 50.