DP工艺Inconel 718合金高温流变曲线修正及应变本构模型

发布时间：2018-06-30 18:04

本文选题：Inconel + 合金　；参考：《中国有色金属学报》2015年12期

【摘要】：采用等温热压缩实验研究DP工艺Inconel 718合金在变形温度为900~1060℃,应变速率为0.001~0.5 s~(-1)条件下的高温流变行为,分析摩擦因数和绝热温升对真应力-真应变曲线的影响,并对摩擦引起的流变应力误差进行了修正,建立了基于应变量的应变本构模型。结果表明:随着应变速率的增大和变形温度的降低,摩擦因数的影响趋于明显,变形激活能和材料常数是应变量的函数。对引入应变量参数建立的用于预测工艺处理的Inconel718合金不同变形量时的流变应力本构模型进行误差分析,其实验值与预测值的相关性系数为0.998,平均相对误差绝对值为3.87%,能够用于准确预测不同变形量时合金的流变应力值。
[Abstract]:The isothermal compression test was used to study the rheological behavior of DP Inconel 718 Alloy at a deformation temperature of 900~1060 C and the strain rate of 0.001~0.5 s~ (-1). The effect of friction factor and adiabatic temperature rise on true stress true strain curve was analyzed, and the strain error caused by friction was corrected, and the strain based on strain was established. The results show that with the increase of the strain rate and the decrease of the deformation temperature, the influence of the friction factor tends to be obvious, the deformation activation energy and the material constant are the function of the strain. The rheological stress constitutive model for the different deformation quantity of Inconel718 gold which is used to predict the process treatment is established. In the error analysis, the correlation coefficient between the actual and the predicted values is 0.998, the absolute value of the average relative error is 3.87%, and it can be used to accurately predict the rheological stress values of the alloys with different deformation quantities.
【作者单位】：中南林业科技大学机电工程学院;中南大学粉末冶金国家重点实验室;
【基金】：国家高技术研究发展计划资助项目(2012AA03A514) 国家自然科学基金资助项目(51401242,51301209,61271356,51205031)
【分类号】：TG146.15

【共引文献】