大型GH4169合金铸锭开坯过程的数值模拟

Cogging Process Simulation for Large Size GH4169 Alloy Ingot

采用全三维有限元方法对大锭型开坯过程进行变形-传热耦合分析,定量计算了铸锭在整个工艺过程中热力参数(应变、应变速率和温度)的分布及演化情况;分析了铸锭的锻透性;获得了开坯后坯料内部应变和温度的分布规律,并与实际生产中的金相检测结果进行了对比。结果表明,模拟结果与试验结果一致,可为科学地制定大规格GH4169合金铸锭的开坯工艺提供理论依据。

A three-dimensional FEM simulation for the cogging process of large size ingot breakdown of GH4169 alloy was performed. The distribution and evolution history of thermomechanical parameters including strain, strain rate and temperature within the billet were calculated quantitatively. Strain penetration within the billet during the cogging process was analyzed as well. In addition, the distribution rules of strain and temperature on the section in both the radial and axial directions were presented. In order to evaluate the rules, the calculating results were compared with the available experimental optical micrographs. The results show that the calculating results agree well with the experiment, and thus can providing the base of the cogging technology for large size GH4169 alloy ingot.