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Comparative Wear Resistance of Diffusion Layers,
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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Steels 20, 25, 45 and 25KhGT, after surface hardening by various diffusion methods, were subjected to abrasive wear tests. The highest resistance to wear in rolling friction was observed after holding 2 hr in a given melt containg 3 percent of a given composition at 850 degrees, followed by immediate quenching in water or oil gas carburizing in natural or synthetic gas, high temperature cyaniding in a given molten mixture at 920 degrees, and nitrocarburizing in a mixture of ammonia and kerosene at 880 degrees produced surfaces of lower wear resistance. The highest resistance in sliding friction was obtaind in the case of steel 45 after boronizing for 5 hr in a given melt at 980-1000 degrees, immediately followed by quenching in oil and tempering for 90 min at 250 degrees boronizing in a given melt resulted in somewhat lower wear resistance, but the wear resistance of all boronized steel 45 samples was still much higher than that of steels 20 and 25 KhGT after any of the above mentioned carburizing treatments.
APPROVED FOR PUBLIC RELEASE