Development of Constitutive Equations and Processing Maps Using Dynamic Modeling Approach

在这个项目中，本构方程和加工图使用动态建模方法将开发金属成形过程。工作材料为英科乃尔718合金。选择这种合金是因为它广泛应用于要求高强度，耐腐蚀性和老化条件下的焊接性的领域。计算机程序将用于计算一组值，给出所需的冲压位置作为应变率和试样高度的特定组合的时间函数。从流动曲线中提取不同应变水平和试验温度下的有效应力和有效应变率值；由此导出本构方程。将开发加工图来描述每种材料的内在可加工性，并评估在稳定和不稳定区域热变形期间发生的耗散/冶金过程，并确定在稳定区域加工材料的最佳温度和应变率范围。该研究在金属成形领域具有重要意义，具有直接的潜在应用前景。

In this project constitutive equations and processing maps using a dynamic modeling approach will be developed for metal forming processes. Inconel Alloy 718 will be used as the work material. This alloy is selected because of its extensive application in areas requiring high strength, corrosion resistance and weldability in aged condition. A computer program will be used to calculate an array of values, giving the desired ram position as a function of time for particular combinations of strain rate and specimen height. Effective stress and effective strain-rate values will be extracted at various strain levels and test temperatures from flow curves; constitutive equations will be derived therefrom. Processing maps will be developed to describe the intrinsic workability of each material and to evaluate the dissipative/metallurgical processes occurring during hot deformation in the stable and unstable regions, and to identify in the stable region the optimum temperature and strain-rate range for processing the materials. This research is important in the area of metal forming and has immediate potential applications.