Abnormal increase of TCP phase during heat treatment in a Ni-based single crystal superalloy. (December 2019)

• Record Type: Journal Article
• Authors: Yin, Bin; Xie, Guang; Lou, Langhong; Zhang, Jian
• Is Part Of: Scripta materialia. Number 173(2019)
• Page Start: 1
• Page End: 4
• Publication Date: 2019-12
• Subjects: Single crystal superalloy -- TCP phases -- Heat treatment -- Segregation -- Supersaturation; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2019.07.027
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Generally, elevated solution heat treatment temperature decreases the residual dendritic segregation of refractory elements (i.e. Re and W) and suppresses the precipitation of deleterious topologically close-packed (TCP) phases in Ni-based superalloys. However, in the present study, elevated solution temperature resulted in an abnormal increase of TCP phases in a Ni-based single crystal superalloy after long-term thermal exposure at 900 °C. Microstructural analysis suggested that higher supersaturation in γ phase which promoted the formation of TCP phases was induced by the increased γ′ precipitation after heat treated at elevated solution temperature. Graphical abstract: Unlabelled Image