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题名: Microstructure evolution and mechanical properties of a new cast Ni-base superalloy with various Ti contents
作者: Ou, MQ;  Ma, YC;  Ge, HL;  Xing, WW;  Zhou, YT;  Zheng, SJ;  Liu, K
发表日期: 2018-2-25
摘要: Microstructure evolution of a new cast Ni-base superalloy with various Ti contents is studied by thermodynamic calculations and experimental observations. According to thermodynamic calculations, when Ti content increases from 2.0 wt% to 4.0 wt%, the gamma' weight fraction firstly increases, and then tends to be relatively stable because of the precipitation of eta phase. Two alloys containing 2.4 wt% and 3.0 wt% Ti are prepared to verify the accuracy of calculation results. After full heat treatment, gamma' phase, MC carbide and M23C6 carbide are precipitated from two alloys, but no h phase is detected. The quantity of gamma' phase and MC carbide in 3.0Ti alloy is higher than that in 2.4Ti alloy because Ti acts as one of their main forming elements. The higher amounts of gamma' phase and MC carbide obviously improve the mechanical properties of 3.0Ti alloy. To verify whether there is eta phase in two alloys or not, long-term aging treatments are carried out at 700 degrees C, 750 degrees C and 800 degrees C for 3000 h. After long-term aging, needle-like h phase is precipitated from 3.0Ti alloy but not from 2.4Ti alloy. The quantity of eta phase in 3.0Ti alloy gradually increases with the increase of aging temperature and time. Especially, the precipitation of eta phase preferentially takes place beside grain boundaries and near MC carbides. The growth of eta phase consumes gamma' phase and causes the appearance of gamma' depleted zones. (C) 2017 Elsevier B.V. All rights reserved.
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Recommended Citation:
Ou, MQ,Ma, YC,Ge, HL,et al. Microstructure Evolution And Mechanical Properties Of A New Cast Ni-base Superalloy With Various Ti Contents[J]. Journal Of Alloys And Compounds,2018,735:193-201.

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