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Hot deformation behaviour of 40CrNi steel and evaluation of different processing map construction methods
Journal of Materials Research and Technology ( IF 6.4 ) Pub Date : 2020-01-15 , DOI: 10.1016/j.jmrt.2020.01.020
Haitao Zhao , Jianjun Qi , Ru Su , Hongqi Zhang , Hongwei Chen , Lijuan Bai , Chengming Wang

40CrNi steel is a low alloy steel with medium hardenability and has been widely used in the manufacturing of crankshafts, wind turbine forgings, etc. As forging is usually involved in the manufacturing of these components, optimization of the hot deformation process of 40CrNi steel is quite critical. Towards this, the prediction of flow stress and the determination of optimal processing parameter windows are of great importance. In this research, isothermal uniaxial hot compression tests were carried out for 40CrNi steel with true strain rates of 0.01, 0.1, 1, 10 and 30 s−1 and temperatures of 850–1200 °C. Both the strain compensated hyperbolic sine constitutive equation and the modified Johnson-Cook model were adopted to predict the flow stress curves, with average absolute relative errors of 0.034 and 0.061, respectively. Processing maps of the tested steel were constructed to determine the optimal deformation parameter windows, and the characteristics of the prior austenite microstructure generally correspond very well to the processing map established. Furthermore, different processing map construction methods were compared and it was found that power-dissipation efficiency maps strongly rely on the σ- ε˙ relationship. Assuming a certain type of constitutive equations leads to monotonic efficiency value patterns. Calculation methods based on experimental results are helpful to reflect the meaningful information carried by the experimental σ- ε˙ relationships.



中文翻译:

40CrNi钢的热变形行为及不同工艺图构建方法的评价

40CrNi钢是一种具有中等淬透性的低合金钢,已广泛用于曲轴,风力涡轮机锻件等的制造中。由于锻造通常涉及这些部件的制造,因此40CrNi钢的热变形工艺的优化相当可观。危急。为此,流应力的预测和最佳加工参数窗口的确定非常重要。在这项研究中,对40CrNi钢进行了等温单轴热压缩试验,其真实应变率分别为0.01、0.1、1、10和30 s -1温度为850–1200°C。均采用应变补偿双曲正弦本构方程和修正的Johnson-Cook模型来预测流动应力曲线,平均绝对相对误差分别为0.034和0.061。构造受试钢的加工图以确定最佳变形参数窗口,并且现有奥氏体显微组织的特性通常与建立的加工图非常吻合。此外,不同的加工图施工方法进行了比较,发现电源散热效率映射强烈依赖于σ -ε˙关系。假设某种类型的本构方程会导致单调效率值模式。基于实验结果的计算方法有助于反映实验σ-携带的有意义的信息。ε˙ 关系。

更新日期:2020-01-15
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