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VACUUM ›› 2022, Vol. 59 ›› Issue (3): 80-85.doi: 10.13385/j.cnki.vacuum.2022.03.16

• Measurement and Control • Previous Articles     Next Articles

Experimental Research on Casting Dimension Effect of Single Crystal Superalloy

LIU Xiao-gong1, JIANG Nan2, HAO Qi-zan1, LUO Liang1, SHI Zhen-xue1, LUO Yu-shi1   

  1. 1. Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China;
    2. Aviation Military Representative Office of Military Aviation Bureau of the Army Equipment Department in Beijing, Beijing 100012, China
  • Received:2022-01-19 Online:2022-05-25 Published:2022-06-01

Abstract: The cylindrical specimens of a single crystal superalloy with diameter of 15mm and 30mm were prepared using the same melting process and directional solidification process. The stress rupture properties at 980℃/250MPa and high cycle fatigue properties at 800℃ of the alloy with two casting dimensions were tested. Dendrite microstructure, the as-cast γ′ phase, heat treated γ′ phase, micropore, stress rupture and high cycle fatigue fractograph and fracture microstructure of the alloy with different casting dimension were examined by OM, SEM and TEM. The results show that with the increase of casting dimension, the primary dendrite arm spacing, the size of as-cast and heat treated γ′ phase, and the size and volume fraction of micropore increase. The stress rupture properties of the alloy decrease, the fracture mechanism has no obvious change and is dimple model with casting dimension increasing. The quantity and size of micro-crack and the γ′ raft thickness on the stress fracture microstructure increase with the casting dimension increasing, while high cycle fatigue properties of the alloy decrease. At last, the relationship between the property and microstructure of the alloy is discussed.

Key words: single crystal superalloy, casting dimension, microstructure, property

CLC Number: 

  • TG132.3
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