Microstructure evolution and mechanical properties of a new cast Ni-base superalloy with various Ti contents

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	Microstructure evolution and mechanical properties of a new cast Ni-base superalloy with various Ti contents
	Ou, MQ; Ma, YC; Ge, HL; Xing, WW; Zhou, YT; Zheng, SJ; Liu, K; Ma, YC (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.
刊名	JOURNAL OF ALLOYS AND COMPOUNDS
	2018-02-25
卷号	735 页码:193-201
关键词	Nickel-based Superalloy Different Ti/al Ratios Eta-phase Elevated-temperatures Thermal Exposure Alloy 740 Behavior Deformation Stability Stress
ISSN号	0925-8388
英文摘要	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.; 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.
学科主题	Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
语种	英语
公开日期	2018-06-05
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79486]
专题	金属研究所_中国科学院金属研究所
通讯作者	Ma, YC (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.
推荐引用方式 GB/T 7714	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.
APA	Ou, MQ.,Ma, YC.,Ge, HL.,Xing, WW.,Zhou, YT.,...&Ma, YC .(2018).Microstructure evolution and mechanical properties of a new cast Ni-base superalloy with various Ti contents.JOURNAL OF ALLOYS AND COMPOUNDS,735,193-201.
MLA	Ou, MQ,et al."Microstructure evolution and mechanical properties of a new cast Ni-base superalloy with various Ti contents".JOURNAL OF ALLOYS AND COMPOUNDS 735(2018):193-201.