大型GH4169D环形锻件组织与性能研究

Study on Microstructure and Mechanical Propertiesof Large Ring Forgings of GH4169D Alloy

对航空发动机用大型GH4169D合金环形锻件的组织和性能进行了研究,介绍了锻造加热温度、加热火次、棒材原始晶粒组织等对GH4169D合金环形锻件晶粒组织的影响,以及不同晶粒组织对其性能的影响。研究结果表明,在标准热处理状态下,减少锻造加热火次、降低锻造加热温度、使用组织更细小均匀的棒材均能细化锻件组织,采用低温模锻制坯+少火次环轧工艺可显著细化锻件最终的晶粒组织;当锻件晶粒度细化到9.5~11级时,可显著提升锻件的拉伸强度及低周疲劳性能。

The microstructure and properties of large GH4169D alloy ring forgings for aero engine were studied.The effects of forging heating temperature,heating number and original grain structure of the bar on the grain structure of GH4169D alloy ring forgings,and the influence of different grain structures on mechanical properties of forgings were introduced.The research results show that in the state of standard heat treatment,the microstructure of forging can be refined by reducing the forging heating numbers,lowering the heating temperature during forging and using the bar with finer and more uniform microstructure.The final grain microstructure of the forging can be refined significantly by the processes of low temperature die forging preforming and less heating number ring rolling.When the grain size is refined to Grade 9.5~11,the tensile strength and low-cycle fatigue property of the forgings can be significantly improved.