深冷处理温度对GH2132合金组织和力学性能的影响

Effects of Cryogenic Temperature on Microstructure and Mechanical Properties of GH21322Alloy

针对航空铁基高温合金材料GH2132合金,进行深冷处理,研究了深冷处理温度对其微观组织、维氏硬度、残余应力、屈服强度和抗拉强度的影响规律,探寻优化组织结构和改善力学性能的方法。研究发现:随着深冷处理温度的降低,GH2132合金的晶粒明显长大,其碳化物析出相由短杆状向颗粒状转变;维氏硬度先上升后下降,在-150℃硬度达到最高值392.2 HV,与室温下的相比提高8.7%;表面残余压应力随着温度降低而不断增大,在-190℃时达到最大值,与室温下的相比提高360%;屈服强度和抗拉强度随温度变化的规律一致,随着温度的降低呈现逐步增加后下降的趋势,在-150℃时达到最大值。此研究能够为高温合金材料组织结构优化和力学性能提升提供参考价值,还为高温合金低温切削提供理论指导。

The effects of cryogenic treatment temperature on the microstructure,Vickers hardness,residual stress,yield strength and tensile strength of GH2132 alloy were studied to explore the method to optimize the microstructure and improve the mechanical properties.It is found that,with the decrease of cryogenic treatment temperature,the grains of GH2132 alloy grow up obviously,and the carbide precipitates change from short rod-shaped phase to granular phase gradually.Vickers hardness increases first and then decreases,and reaches the highest of 392.2 HV at-150℃,which is 8.7%higher than that of at room temperature.The residual compressive stress on the surface increases with the decrease of temperature and reaches the maximum at-190℃,which is 360%higher than that of at room temperature.The yield strength and tensile strength change with the temperature in the same way.With the decrease of temperature,the yield strength and tensile strength gradually increase and then decrease,and reach the maximum value at-150℃.This study can provide reference value for microstructure optimization and mechanical properties improvement of superalloy materials,and also provide theoretical guidance for low temperature cutting of superalloy materials.