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Vol.33, No.3, 301 ~ 308, 1995
Title
Effects of Nb and V Addition in Si - Cr Spring Steels
최해창Hae Chang Choi, 남원종Won Jong Nam
Abstract
The effects of Nb and V addition on mechanical properties and microstructures were investigated in conventionally heat treated(quenched and tempered) Si-Cr spring steels. The specimens were austenitized at 850℃ for 15min and tempered at 470℃ for 15min. The addition of vanadium raised tensile strength by about 5kg/㎟, while that of niobium did not show any influence on tensile strength. The addition of V and Nb increased the hardness over the entire tempering temperatures, but did not have an effect on softening resistance which occurred by the Si addition. The impact values were not changed by the addition of vanadium and niobium. When tempered at 470℃, all steels showed the cementite precipitation in addition to asquenched microstructures. (Received July 4, 1994)
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