ABSTRACT The effects of cooling rate and carbon equivalent on the tensile strength of pearlitic lamellar graphite cast irons were investigated. The cooling rate was varied from 6°C/s to 35°C/s for values of the carbon equivalent equal to 4.17% and 3.83%. The increase in the cooling rate promoted the refining of the eutectic cell size, primary dendrite modulus, interdendritic hydraulic diameter and pearlite interlamellar spacing. The increase in the cooling rate also refined their graphite flakes, changing the morphology from B to E type. The reduction in the carbon equivalent increased the proportion of primary dendrites from 25% to 40%. The maximum tensile strength increased from 274 to 524 MPa with the increase in the cooling rate and the reduction in the carbon equivalent. These results were used to test two tensile strength predictive models based on modified versions of the Griffith and Hall-Petch equations.

中文翻译：

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冷却速度对珠光体片状石墨铸铁抗拉强度的影响

摘要 研究了冷却速度和碳当量对珠光体片状石墨铸铁抗拉强度的影响。对于等于 4.17% 和 3.83% 的碳当量值，冷却速率从 6°C/s 变化到 35°C/s。冷却速度的增加促进了共晶泡孔尺寸、初生枝晶模量、枝晶间水力直径和珠光体层间距的细化。冷却速度的增加也细化了它们的石墨薄片，将形态从 B 型变为 E 型。碳当量的降低使初级枝晶的比例从 25% 增加到 40%。随着冷却速度的增加和碳当量的降低，最大抗拉强度从274 MPa增加到524 MPa。