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首页> 外文期刊>Journal of Materials Engineering and Performance >Effects of Controlled Cooling-Induced Ferrite–Pearlite Microstructure on the Cold Forgeability of XC45 Steel
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Effects of Controlled Cooling-Induced Ferrite–Pearlite Microstructure on the Cold Forgeability of XC45 Steel

机译：控制冷却诱导铁素体 - 珠光体微观结构对XC45钢冷易易损的影响

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The combination of hot/warm and cold forging with an intermediate controlled cooling process is a promising approach to saving costs in the manufacture of automobile parts. In this work, the effects of the ferrite–pearlite microstructure, which formed after controlled cooling, on the cold forgeability of a medium-carbon steel were investigated. Different specimens for both normal and notched tensile tests were directly heated to high temperature and then cooled down at different cooling rates, producing different ferrite volume fractions, ranging from 6.69 to 40.53%, in the ferrite–pearlite microstructure. The yield strength, ultimate tensile strength, elongation rate, percentage reduction of area, and fracture strain were measured by tensile testing. The yield strength, indicating deformation resistance, and fracture strain, indicating formability, were used to evaluate the cold forgeability. As the ferrite volume fraction increased, the cold forgeability of the dual-phase ferritic–pearlitic steel improved. A quantitatively relationship between the ferrite volume fraction and the evaluation indexes of cold forgeability for XC45 steel was obtained from the test data. To validate the mathematical relationship, different tensile specimens machined from real hot-forged workpieces were tested. There was good agreement between the predicted and measured values. Our predictions from the relationship for cold forgeability had an absolute error less than 5%, which is acceptable for industrial applications and will help to guide the design of combined forging processes.
机译：热/温锻和冷锻与中间控制冷却工艺相结合是汽车零件制造中一种有希望节约成本的方法。本文研究了控制冷却后形成的铁素体-珠光体组织对中碳钢冷锻性能的影响。正常拉伸和缺口拉伸试验的不同试样直接加热至高温，然后以不同的冷却速率冷却，在铁素体-珠光体微观结构中产生不同的铁素体体积分数，范围为6.69%至40.53%。通过拉伸试验测定了屈服强度、极限拉伸强度、延伸率、断面收缩率和断裂应变。屈服强度（表示变形抗力）和断裂应变（表示成形性）用于评估冷锻性。随着铁素体体积分数的增加，双相铁素体-珠光体钢的冷锻性能得到改善。根据试验数据，得到了XC45钢铁素体体积分数与冷锻性能评价指标之间的定量关系。为了验证数学关系，对真实热锻工件加工的不同拉伸试样进行了测试。预测值与实测值吻合良好。我们对冷锻性关系的预测绝对误差小于5%，这对于工业应用是可以接受的，并将有助于指导组合锻造工艺的设计。

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