采用真空水平连铸技术制备了典型铸造高温合金 K418母合金，分析了真空连铸 K418母合金的夹杂物含量、微观组织及其对力学性能的影响。结果表明：真空连铸 K418母合金的夹杂物含量较模铸降低80％，微观组织细小，疲劳寿命显著增加，并且铸坯本体取样的力学性能远高于标准成型试样的水平，进一步挖掘了合金的性能潜力。分析认为，真空水平连铸技术的底铸充型、水冷铜模快速凝固等工艺特点是 K418母合金洁净度提高、微观组织细小的主要原因，进而导致其疲劳、持久和拉伸性能全面升高。
K418 superalloy barstock were manufactured by vacuum horizontal continuous casting (VHCC)technology.The inclusion,microstructure and corresponding mechanical properties of VHCC K418 superalloy were analyzed.The results show that the inclusions of VHCC K418 superalloy drop sharply 80%,the microstructure is fine and the fatigue life in-crease significantly by comparing with conventional top die casting barstock,and the mechanical properties of VHCC K418 are better than that of standard sample,revealing that VHCC technology could exploit the potential performance of alloy.It was analyzed that the characteristics of VHCC such as bottom casting,rapid solidification by water-cooled copper mould are the main reasons for high cleanliness and finer microstructure of K418 barstock,resulting in comprehensive im-provement of mechanical properties such as fatigue,stress rupture and tensile.
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