单晶高温合金共晶溶解行为的差热分析

张少华, 谢光, 董加胜, 楼琅洪

Investigation on Eutectic Dissolution Behavior of Single Crystal Superalloy by Differential Scanning Calorimetry

ZHANG Shaohua, XIE Guang, DONG Jiasheng, LOU Langhong

表1 EPMA测量的铸态样品枝晶轴、细小γ/γ′共晶和粗大γ/γ′共晶的成分 (mass fraction / %)

Table 1 Chemical compositions of dendritic core, fine γ/γ′ eutectic, and coarse γ/γ′ eutectic of as-cast alloy tested by EPMA

Position Al Cr Mo Co Ta W Re Ni Nominal composition 5.5 5 2 10 9 6 3 Bal. Dendritic core 5.12 5.02 1.66 11.40 4.94 7.69 3.40 Bal. Fine γ/γ′ eutectic 6.52 3.87 1.61 9.26 11.08 3.53 1.35 Bal. Coarse γ/γ′ eutectic 7.40 2.05 0.86 7.66 14.54 2.28 0.32 Bal.