Study on the Wear Resistance of Sinter Alloying Steel by Deep Cryogenic Treatment
Sintered alloy steel powder with four different hardenability of FN0200, FN0208, FD0408, and FLNC4808 are applied to form the sintered alloy steel. The sintered alloy steel, being cooled down to room temperature, is further soaked in-196℃liquid nitrogen for 4hrs deep cryogenic treatment.With deep cryogenic treatment, the retained austenite in the sintered alloy steel would change the phase and become martensite, and the apparent hardness of sintered alloy steel would be enhanced. Further analyzing the effect of deep cryogenic treatment on the wear resistance of sintered alloy steel, the wear resistance would be improved when the apparent hardness of sintered alloy steel is enhanced. However, the deep cryogenic treatment would change the sintered alloy steel microstructures because of distinct hardenability. Such research findings show the significant effect of deep cryogenic treatment on the sintered alloy steel with high hardenability, where the best hardness and wear resistance could be acquired from FLNC4808 sintered alloy steel through the deep cryogenic treatment.
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