DP工艺GH4169合金热加工高通量测试方法
发布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新时间：2016-07-05
以经DP工艺处理的GH4169合金为对象，研究热加工高通量双圆锥台试样测试方法，利用数值模拟方法进行双圆锥台试样关键尺寸设计，探讨热加工工艺参数对双圆锥台试样等效应变场分布的影响规律，进行实际试验验证，分析晶界取向差和晶界分布特征。
DP工艺GH4169合金热加工高通量测试方法High-throughput testing on hot working of delta-processed GH4169 alloy以经DP工艺处理的GH4169合金为对象，研究热加工高通量双圆锥台试样测试方法，利用数值模拟方法进行双圆锥台试样关键尺寸设计，探讨热加工工艺参数对双圆锥台试样等效应变场分布的影响规律，进行实际试验验证，分析晶界取向差和晶界分布特征。结果表明:摩擦因数对等效应变影响显著，随着摩擦因数的提高，试样中心位置应变量增加，应变梯度加大；随着变形温度的升高和变形速率的减小，试样中心附近的等效应变降低，能促进δ相的溶解和断裂，加快动态再结晶的发生，增大动态再结晶晶粒尺寸；经(1000 ℃，0.01 s-1)热变形后高通量双圆锥台试样中心由于动态再结晶导致小角晶界数量很少，统计频率仅为5.6%，外缘变形量低，晶界数量中大角晶界占比高达92.3%，晶内分布有原始孪晶；随着变形温度提高，小角晶界不断减少，孪晶数量有所增加。
High throughput testing technology for the hot working of superalloy was put forward for GH4169 alloy with delta process. The key dimension of the double cone sample was designed by finite element modeling method. The effects of hot working parameters on the effective strain were discussed. Then experiments were carried out, grain boundary orientation and grain boundary distribution character were researched. The results show that effect of friction coefficient on the effective strain is significantly. With increasing the friction coefficient, the strain of specimen center and the strain gradient increase. With increasing deformation temperature and decreasing strain rate, the effective strain of specimen center reduces. It can promote the dissolution and breakage of δ phase. Then the dynamic recrystallization volume fraction and dynamic recrystallization grain size are raised. When the hot working parameter is (1000 ℃, 0.01 s-1), the number of low angle grain boundaries is 5.6% at the center of double cone sample. The ratio of high angle grain boundaries is 92.3%, and twin crystals mainly distribute at the outer rim due to the lowest strain. With increasing deformation temperature, the number of low angle grain boundaries decrease, the grain size and twin increase.
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