<総説>高温浸炭した低合金2相鋼の機械的性質

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In the previous paper, we reported the low alloyed dual-phase steel couldbe used for elevated temperature case hardening steels without the first stepquenching from microstructure observations. In the present work, mechanicalproperties and optimum quenching temperature of the dual-phase steels werein vestiga ted for practical case hardening applications.The microstructural and mechanical properties of the 0.05 mass% C-2.0 mass% Si- (0.05 mass% Nb and 0.05 mass% Ti) steels carburized at 1323 K for 10.8 ks,quenched from 1123 K-1223 K and then tempered at 423 K were studied. The maximumtensile and fatigue strength of the 2.0 mass% Si steel and the 2.0 mass%Si- (0.05 mass% Nb and 0.05 mass% Ti) steel were obtained after quenching from1123K and 1223K, respectively. These properties were much higher than thoseof the conventional case hardening steel obtained by two step quenching. Thewear resistance was not affected by quenching temperature and was much superiorin the regions of higher and lower sliding speed compared with the carbontool steel (SK 3). Skipping the first step quenching and carburizing at elevatedtemperatures make the processing time shorter and energy consumption to fabricate materials smaller. Thus, the dual-phase steel is considered to have apotential for practical use for the elevated temperature case hardening steel.
秋田大学の論文