VHCF, Tribology Amp, and Impact Characteristics of Bainite and Tempered Martensite Spring Steels

초록

: Studies have reported that the bainitic structure obtained by austempering spring steels exhibits higher strength and ductility than the Q/T-treated tempered martensite structure. However, quantitative studies on VHCF, tribology, and impact characteristics of bainitic steel required for the durability design of next-generation springs are insufficient. Therefore, in this study, fatigue characteristics of VHCF that is a new VHCF design standard with spring steel of bainite and tempered martensite structures were obtained. We quantitatively analyzed the characteristics of microstructure transformation associated with heat treatment cycles and studied and analyzed the fatigue, VHCF, tribology, and impact characteristics using the fracture mechanics method and fracture surface analysis through EBSD, SEM, and EDS.

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