面向燃气涡轮叶片再造加工基准组织和性能研究

Study on the Microstructure and Properties of Zn-Al Alloy for Gas Turbine Blade Machining Benchmark

针对燃气涡轮叶片低熔点合金浇注加工基准要求具有高硬度和脆性的问题,研究添加不同质量分数的Mg对锌铝合金组织和性能的影响。结果表明:锌铝合金室温下显微组织主要由富锌相η-Zn枝晶、锌铝共晶组织β+η、富镁相MgZn_(2)和Mg_(2)Zn_(1)1组成;添加Mg的质量分数为2%时,锌铝合金维氏硬度为126.8 HV,三点弯曲试样压断所需加载的最大载荷为1093.6 N,符合低熔点合金浇注的方法再造涡轮叶片加工基准的实际生产要求。

In order to meet the requirements of high hardness and brittleness in the casting process of low melting point alloy for gas turbine blades,the effects of dfferent mass fractions of Mg on microstructure and properties of zinc-aluminum alloy were studied.The results show that the microstructure of zinc-aluminum alloy at room temperature is mainly composed of zinc-rich phase n-Zn dendrite and zinc-aluminum eutectic structure β+n,magnesium-rich phases MgZn_(2) and Mg_(2)Zn_(1)l.When the mass fraction of the added Mg is 2%,the vickers hardness of zinc-aluminum alloy is 126.8 HV,and the maximum load required for breaking three-point bending specimen is 1093.6 N,which meets the reconstruction requirements of the actual production of the low melting point machining benchmark for turbine blades.