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通过1100℃长期时效100~800 h,研究了一种试验第3代单晶高温合金组织演化规律。结果表明:随着时效时间的增加,枝晶干γ′相逐渐变得粗大和不规则;而枝晶间γ′相形貌则随着时效时间的延长呈规则立方、合并长大、筏排化规律演化。枝晶干与枝晶间这种不同的γ′相演化规律主要由合金元素的偏析造成。时效300 h后,枝晶干析出了少量的针状TCP相,随着时效时间增加,枝晶干处TCP相析出量增加;枝晶间直到800 h仍未发现TCP相析出;TEM和EDX分析表明析出相为σ相,富含Re、W元素。
The microstructure evolution of a third generation single crystal superalloy was studied by long-term aging at 1100 ℃ for 100 ~ 800 h. The results show that the dendritic dry γ ’phase becomes coarse and irregular with the increase of the aging time, while the γ’ phase morphology of the dendrite becomes regular cubic with the extension of the aging time, Evolution of law. Dendrites dry and dendrite this different between the evolution of γ ’phase mainly due to the segregation of alloying elements. After aging for 300 h, a small amount of needle-like TCP phase was precipitated. With the increase of aging time, the precipitation of TCP phase in the dendrites increased. The precipitation of TCP phase did not occur until 800 h in the dendrites. TEM and EDX analysis Show precipitation phase is σ phase, rich in Re, W element.