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Effect of Solidification Behavior on Microstructures and Mechanical Properties of K4169 Alloy Investment Casting

机译：凝固行为对K4169合金投资铸造微观结构和力学性能的影响

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摘要

The effect of solidification behavior on the microstructures and mechanical properties of K4169 alloy investment casting is given. Metallographic and image analysis have been used to quantitatively examine the microstructures' evolution. With the cooling rate decreasing, the volume fraction and maximum equivalent radius of the Laves phase increases from 0.3% to 1.2%, from 11.7μm to 23.4μm, respectively. Meanwhile, the volume fraction and maximum equivalent radius of carbides increase from 0.3% to 0.5%, from 8.1μm to 9.9 μm, respectively. All the above aspects lead to the quality index of the casting from 1294.2 MPa to 954.0 MPa. In addition, the smooth flat areas of the tensile fracture surface become small, and cracks propagated preferentially along the Laves phase in the absence of microporosity as the cooling rate decreasing.
机译：给出了凝固行为对K4169合金投资铸造的微观结构和力学性能的影响。已经使用金相和图像分析来定量检查微结构的进化。随着冷却速率的降低，疏浚体积分数和最大当量半径分别从11.7μm至23.4μm增加0.3％至1.2％。同时，体积分数和最大等效半径分别从8.1μm至9.9μm增加到0.3％至0.5％。所有上述方面都导致铸件的质量指数从1294.2MPa到954.0 MPa。另外，拉伸骨折表面的光滑平坦区域变小，并且在没有微孔的情况下，沿着疏浚阶段优先地传播裂缝，因为冷却速率降低。

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