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采用普通铸造(CC)和铸型搅动细晶铸造(MAFGC)工艺浇注了K492M合金向心叶轮,分别制得了平均晶粒度为ASTM M6级(4.5 mm)和ASTM 1级(0.25 mm)的铸件。研究了MAFGC工艺对K492M合金向心叶轮轮盘组织与力学性能的影响。结果表明:与普通铸造相比,MAFGC工艺有效破碎了枝晶,细化了晶粒和枝晶组织,减小了碳化物的尺寸且使其分布更加均匀,使向心叶轮制件800℃以下的拉伸强度显著提高。800~1 000℃之间时,细晶铸造与普通铸造向心叶轮拉伸性能相当。
K492M alloy centripetal impeller was cast by CC and MAFGC, and castings with average grain size of ASTM M6 grade (4.5 mm) and ASTM grade 1 (0.25 mm) were prepared respectively. . The effect of MAFGC technology on the microstructure and mechanical properties of K492M alloy centripetal impeller was studied. The results show that compared with ordinary casting, MAFGC process effectively crushes dendrites, refine grains and dendritic structures, reduces the size of carbide and makes it more evenly distributed, so that centripetal impeller components below 800 ℃ Tensile strength increased significantly. Between 800 ~ 1000 ℃, fine-grained casting and ordinary casting centripetal impeller tensile properties quite.