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利用扫描电镜对GH4586B合金在750℃下时效1500 h过程中的显微组织和室温拉伸断口进行观察分析。结果表明,GH4586B合金在时效过程中无有害TCP相(拓扑密堆相)析出,晶内析出尺寸差异较大的两种γ′相粒子,随着时效时间的延长,大尺寸的γ′相逐渐长大,形貌由球形逐步转变为方形,且间距也逐渐变大,这种γ′相析出的特征有利于合金强韧性的匹配;合金在室温下随着时效时间的延长,强度和塑性发生变化,时效500 h后合金具有较好的强度和塑性的匹配,这与γ′相析出的形貌、分布、数量直接相关;通过室温拉伸断口的形貌分析,合金断裂均具有塑性断裂特征。
The microstructure and room temperature tensile fracture of GH4586B alloy at 750 ℃ for 1,500 h were observed by scanning electron microscopy. The results show that during the aging process, GH4586B alloy has no harmful TCP phase (topological close-packed phase) precipitation and two γ ’phase particles with large size difference are precipitated in the grain. As the aging time prolongs, the large size γ’ The morphologies of the γ ’phase precipitates are gradually changed from spherical shape to square shape and the distance between them is gradually larger. The characteristics of γ’ phase precipitation are favorable for the matching of the toughness of the alloy. The strength and ductility of the alloy with the aging time increases at room temperature After aging for 500 h, the alloy has a good match of strength and plasticity, which is directly related to the morphology, distribution and quantity of γ ’precipitates. The morphologies of the alloy fracture at room temperature are characterized by plastic fracture .