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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：具有中间控制冷却过程的热/暖和冷锻造的组合是一种有望的方法，可以节省汽车部件的制造成本。在这项工作中，研究了在控制冷却后形成的铁素体 - 珠光体微观结构对中碳钢的冷易损进行了影响。将正常和切口拉伸试验的不同标本直接加热至高温，然后以不同的冷却速度冷却，产生不同的铁氧体体积分数，从6.69至40.53％的范围内，在铁氧体 - 珠光体微观结构中。通过拉伸试验测量屈服强度，极限拉伸强度，伸长率，面积减小率和断裂菌株。使用屈服强度，表明变形性和断裂菌株，表明可成形性，评估冷易易损。随着铁氧体体积分数的增加，双相铁素体 - 珠光体钢的冷易易损改善。从试验数据中获得铁氧体体积分数与XC45钢冷易易损性评价指标之间的定量关系。为了验证数学关系，测试了从真正的热锻工件加工的不同拉伸试样。预测和测量值之间存在良好的一致性。我们从寒冷的易恶化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，并有助于指导组合锻造过程的设计。

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