对比了高温度和低温度梯度下NASAIR100单晶的组织和高温持久性能,发现高温度梯度降低单晶中显微疏松含量,减小树枝晶间里和显微偏析程度,使单晶具有较少的γ/γ′共晶和较细的,形状较规则的γ′沉淀.在相同的抽拉速率下,高温度梯度提高铸态NASAIR100单晶的高温持久寿命可达11倍多,固溶处理进一步改进单晶的组织和高温持久性能.
The microstructure and high temperature stress rupture properties of a nickel-base single crystal superalloy NASAIR100 cast in both high and low thermal gradients have ben investigated comparatively. It was found that the high thermal gradient casting enh
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