单晶再结晶临界应力与涡轮叶片结构设计参数间的映射模型

以单晶涡轮叶片发生再结晶的榫头进气窗口为研究对象,基于镍基单晶合金再结晶临界应力模型,通过单晶叶片铸造热应力场仿真计算,建立了最大残余应力与结构参数和温度的关系模型;并在此基础上,以最大铸造残余应力不大于再结晶临界应力、冷气通道面积不变和满足强度为约束条件,求出了不发生再结晶条件下的临界应力与结构设计参数和热处理温度的映射模型。最后通过对实际叶片榫头进气窗口的优化设计和试验对比分析,验证了本文方法的有效性。结果表明,优化后榫头进气窗口最大铸造残余应力下降30%以上,原有的再结晶现象消除。

Relationship Model Between Recrystallization Critical Stress and Structure Designed Parameters on Single Crystal Turbine Blade

Around the parameter of the blade section shape, the air inlets of blade root are investigated. Firstly, based on the model of recrystallization critical stress for signal crystal alloy, the relationship model between residual stress and optimization parameters is established by the simulation method. Secondary, the detail-structur e with recrystallization is optimized under the constraint conditions of recryst allization critical stress and strength. Finally, through the analysis and comparison of the actual blade, the proposed model is effectively verified. The results show that the max-residual stress is completely reduced by 30%, and the recrystallization is effectively eliminated.