Influence of Heat Treatment Temperature on the Microstructures and High Cycle Fatigue Properties of DD6 Single Crystal Superalloy

Abstract:

The effect of heat treatment temperature on the microstructure and the high cycle fatigue property of DD6 single crystal superalloy was investigated. After standard heat treatment, the alloy was hold at 1200°C and 1300°C for 1h respectively, and then air-cooled. The results showed that after heat treatment at 1200°C for 1h, the size of γ′ particles became slightly larger and quite unevenly, at the same time, the serrated γ/γ′ interface appeared. After heat treatment at 1300°C for 1h, the small irregular γ′ particles re-precipitated. In addition, a small number of fine secondary γ′ particles were also observed in the matrix channel of the alloy after primary aging of 1200°C/1h and 1300°C/1h. The high cycle fatigue properties of the alloy by standard heat treatment were higher than that of the alloy by 1200°C/1h and 1300°C/1h, but the decreased degree of 1200°C/1h was much bigger than that of 1300°C/1h. Analysis on fracture surfaces of the alloy at 800°C demonstrated a quasi-cleavage mode.

• Periodical: Materials Science Forum (Volume 898)
• Pages: 480-486
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.898.480
• Online since: June 2017
• Authors: Hong Ji Xie*, Jia Rong Li, Xiao Dai Yue
• Keywords: DD6, High Cycle Fatigue Property, Microstructure, Temperature

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