高温合金单晶铸件中共晶组织分布的表面效应

马德新, 赵运兴, 徐维台, 皮立波, 李重行

Surface Effect on Eutectic Structure Distribution in Single Crystal Superalloy Castings

MA Dexin, ZHAO Yunxing, XU Weitai, PI Libo, LI Zhongxing

表2 变截面试棒外环区域上、下表面化学成分的对比

Table 2 Composition measured on the upper surface and bottom surface (C_U and C_B), and the corresponding macroscopic segregation ratio (k_M)

Element	C_U / (mass fraction / %)	C_B / (mass fraction / %)	k_M = C_B / C_U
Cr	4.19	3.99	0.95
Co	6.81	6.94	1.02
W	6.87	7.85	1.14
Mo	0.49	0.66	1.35
Al	5.12	4.54	0.89
Ti	0.29	0.10	0.34
Ta	8.37	6.83	0.82
Re	4.25	5.90	1.39
Ni	63.62	63.19	0.99