발간논문

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Vol.36, No.3, 362 ~ 368, 1998
Title
Fatigue Properties of Ferrite-Pearlite Hot-rolled Steel Sheets for Automobiles
박기종 , 조열래 , 정진환 K . J . Park , Y . R . Cho , J . H . Chung
Abstract
High cycle and low cycle fatigue properties of high strength hot-rolled steel sheets have been studied with respect to their tensile strength and strengthening mechanisms. Fully reversed low cycle fatigue test has been conducted at a rate of 6x10^(-3)s^(-1). Specimen for monotonic tensile tests and cyclic fatigue tests have been obtained from the topend of hot-rolled coils. Fatigue strength is increased with the increase in tensile strength up to 60㎏/㎟, then it is gradually leveled off above 70㎏/㎟. The C-Mn steel with low yield ratio shows lower fatigue strength ratio than Nb containing precipitation hardened steel with high yield ratio. The extent of cyclic softening in the C-Mn-Nb steels is higher than that of the C-Mn steels. This could be qualitatively interpreted by the low plastic strain amplitude formed during the cyclic deformation. The softening and the associated planar dislocations configuration could be qualitatively interpreted by assuming the existence of precipitation strengthening by interstitial atoms and the breakdown of the complexes during the cyclic deformation.
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