Effect of Grain Size on As-cast Microstructure and Properties of Ni3Al-based MX246AG Alloy

Changes in microstructure and properties of MX246AG alloy with different grain sizes. The results show that with the decrease of grain size, the size of dendrite dry γ' phase decreases, and the MCⅡ type carbide gradually changes from block to dot. After the grain size grade was increased from M6 to M11, the low-cycle fatigue life of the alloy at 850 ℃ increased significantly by 4.7 times, and the room temperature tensile strength of the alloy increased, and the elongation at 850 ℃ increased significantly