γ' 相强化钴基高温合金成分设计与蠕变机理研究进展

冯强, 路松, 李文道, 张晓瑞, 李龙飞, 邹敏, 庄晓黎

Recent Progress in Alloy Design and Creep Mechanism of γ'-Strengthened Co-Based Superalloys

FENG Qiang, LU Song, LI Wendao, ZHANG Xiaorui, LI Longfei, ZOU Min, ZHUANG Xiaoli

表1 γ'相强化钴基高温合金的主要合金元素及其作用

Table 1 Typical elements and their effect on the γ'-strengthened Co-based superalloys

Type Element Radius Density Positive effect Negative effect nm g·cm-3 γ former Co 0.125 8.9 - - Ni 0.125 8.9 Enlarge γ + γ' region Form η phase with Ti Cr 0.128 7.2 Enhance oxidation/corrosion Decrease the stability of γ' phase, form resistance secondary phases Fe 0.126 7.9 Stabilize γ phase Decrease the stability of γ' phase γ′ former Al 0.143 2.7 Stabilize γ' phase, enhance Form β phase oxidation resistance W 0.141 19.4 Stabilize γ' phase, Increase alloy density, form μ and χ phases enhance creep property Ti 0.172 4.5 Stabilize γ' phase, Form β and η phases enhance creep property Ta 0.147 16.5 Stabilize γ' phase, Form μ and χ phases enhance creep property Mo 0.140 10.2 Solution strengthening Form μ and χ phases Nb 0.147 8.5 Stabilize γ′ phase, Form μ, χ, and Laves phases enhance strength V 0.135 6.1 Stabilize γ′ phase, Decrease oxidation resistance enhance strength Hf 0.159 13.3 Stabilize γ′ phase, Form Laves phase enhance strength