Effect of thermal stability of γ′ phase on the recrystallization behaviors of Ni-based single crystal superalloys. (15th September 2017)

• Record Type: Journal Article
• Authors: Qin, Lu; Pei, Yanling; Li, Shusuo; Zhao, Xinbao; Gong, Shengkai; Xu, Huibin
• Is Part Of: Materials & design. Volume 130(2017)
• Page Start: 69
• Page End: 82
• Publication Date: 2017-09-15
• Subjects: Recrystallization -- Superalloy -- Thermal stability -- Order; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2017.05.044
• Languages: English
• ISSNs: 0264-1275

Abstract

Abstract: The recrystallization may deteriorate the mechanical properties of single crystal superalloys greatly, which concerns the engineers and scientists in the aviation industry. Recrystallization behaviors after grit-blasting and annealing at different temperatures of a γ′-richen experimental single crystal alloy IC32 (the as-cast and heat-treated) were investigated. Samples of the as-cast ones are less prone to recrystallization than the heat-treated ones. In the as-cast state, the interdendritic regions show a stronger resistance to recrystallization than the dendritic regions. According to the results, we can conclude that the size characteristics and thermal stabilities of the γ′-phases play important roles in deciding the recrystallization resistances of the Ni-based single crystal superalloys. Graphical abstract: Highlights: The massive kinds of alloys are avoided to investigate the key factors of the recrystallization resistance. Higher Al contents guarantee the higher thermal stability of the γ＇phase. The size and thermal stability of γ＇phase determines the recrystallization resistance of Ni-base SX superalloy. In the as-cast state, the site where there exists larger γ＇phases show a weak tendency to recrystallization. The heat-treated samples show a stronger tendency to recrystallization than the as-cast samples.