钨铜合金粉热等静压致密化过程的有限元模拟

Finite Element Simulation of Hot Isostatic Pressing Densification Process for W-Cu Alloy Powder

利用DEFORM-2D有限元软件对钨铜混合粉在包套密封条件下的热等静压工艺过程进行了有限元模拟,分析了坯料在该过程的致密化规律;运用交叉试验法制定出保温温度、保压压力和保温保压时间的正交优化方案,绘制出相对密度在温度和压力平面内的等高线云图,进而提出最优的参数方案;根据模拟结果进行了热等静压试验。结果表明:坯料的致密化过程是先边缘后中心;模拟得到最优的热等静压参数方案为950℃/110MPa/2h,在此方案下,坯料整体的相对密度可达到96%以上;在最佳方案下,相对密度的模拟和试验结果的最大误差为1.27%,平均误差约为0.2%。

The process of hot isostatic pressing （HIP） on tungsten copper alloy powder sealed in wrap was simulated by using DEFORM-2D finite element software, and densification law of blank was analyzed; orthogonal optimization schemes of temperature, pressure and time were established by cross-over test way and the contour line cloud figure of relative density in temperature and pressure plane was drawn. The best program parameters were also proposed. According to the results of simulation, hot isostatic pressing experiment was carried out. The results show that the densification firstly appeared in the blank＇s edge, and then appeared in its center. The best parameter scheme for HIP was 950 ℃/110 MPa/2 h, which made overall relative density of the blank be more than 96%. Under the best scheme, the maximum error between simulated and experimental results of relative density was 1.26 %, and the average error was 0.2 %.