采用有限元软件模拟了高温合金K4202复杂薄壁件在低过热度浇注条件下的流场、温度场和凝固组织。结果表明,K4202高温合金复杂薄壁件在低过热度浇注时可以获得充型完整的铸件;高温合金K4202复杂薄壁铸件的厚大部位和变截面部分易出现缩松缺陷;当高温合金在低过热度浇注时,铸件整体获得了等轴晶均匀分布的细晶组织,晶粒度达ASTM2-3。 The flow field, temperature field and solidification microstructure of high-temperature alloy K4202 complex thin-walled parts under low superheat pouring conditions were simulated by finite element software. The results show that the full-thickness castings of K4202 superalloy thin-walled parts can be obtained at low superheat pouring temperature. The thick parts and the cross-section of high-temperature alloy K4202 are prone to shrinkage defects. When the superalloy is in the low Overheating casting, the casting obtained an equiaxed uniform distribution of fine grain, grain size of ASTM2-3.