AS-SINTERED AISI 440C STAINLESS STEELS WITH IMPROVED HARDNESS AND CORROSION RESISTANCE

作者：Ovri Henry^*; Ohaukwu Chukwuemeka J; Bahadirov Kudrathon; Larson Mikael; Kjeldsteen Peter

来源：International Journal of Powder Metallurgy, 2010, 46(6): 43-50.

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 degrees C gives an optimum combination of the as-sintered properties.

• 出版日期2010-12