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STEEL COMPONENT FOR HIGH-TEMPERATURE CARBURIZING WITH EXCELLENT SPALLING STRENGTH AND LOW-CYCLE FATIGUE STRENGTH
STEEL COMPONENT FOR HIGH-TEMPERATURE CARBURIZING WITH EXCELLENT SPALLING STRENGTH AND LOW-CYCLE FATIGUE STRENGTH
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机译：具有出色的抗压强度和低循环疲劳强度的高温渗碳钢成分
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摘要
This steel component for high-temperature carburizing which has excellent spalling strength and low-cycle fatigue strength and which is useful as a material for power transmission components, etc., is provided by suitably adjusting the chemical component composition, setting the average C concentration up to a depth of 0.05mm from the surface to 0.50% or greater, and controlling the average circle equivalent diameter Dm(μm) and the number density Nm (number/mm2) of MnS in a non-carburized portion, the average circle equivalent diameter Dt(μm) and the number density Nt (number/mm2) of TiN in the non-carburized portion, the Vickers hardness Hs (HV) at a position 0.05mm deep from the surface and the Vickers hardness Hi (HV) at the non-carburized portion measured with a test force of 300gf, and the effective hardened layer depth ECD (mm) so as to satisfy the expressions A=exp{Dm/10+Nm1/2/50}×exp{Dt/15+Nt1/2/50}, B=exp{Hs/650+ECD1/2+Hi/250}, C=exp[Hs/650-ECD-{(0.89×Hi-202.16)/250}2], 3.7×A-0.47×B+1.14≦0, and C≧0.66.
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