Abstract: 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.
Authors: Maodong Kang, Jun Wang, and Haiyan Gao
Keywords: K4169 Alloy, Solidification Behavior, Laves Phase, Properties