EVOLUTION OF delta PHASE IN INCONEL 718 ALLOY DURING DELTA PROCESS

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	EVOLUTION OF delta PHASE IN INCONEL 718 ALLOY DURING DELTA PROCESS
	Zhang Haiyan; Zhang Shihong; Cheng Ming
刊名	ACTA METALLURGICA SINICA
	2009-12-11
卷号	45 期号:12 页码:1451-1455
关键词	Inconel 718 alloy Delta process delta phase deformation spheroidization
ISSN号	0412-1961
通讯作者	Zhang Shihong(shzhang@imr.ac.cn)
英文摘要	Superalloy Inconel 718 is an important material used for aero-engine high temperature turbine disks. The grain refining of Inconel 718 becomes critical because of the improvement in the quality and reliability of aero-engine. Inconel 718 turbine disks are manufactured by multi-stage hot deformation processes, in which the recrystallized grain grows up in next passes. Therefore, it is difficult to obtain a uniform and refined microstructure by recrystallization refining. The delta phase in Inconel 718 can control grain size through the strong pinning effect. Thus, the Delta process (DP) has been applied for the forging of Inconel 718. In this paper, for the DP of Inconel 718, the evolution of delta phase during isothermal compression deformation at temperature of 950 degrees C and strain rate of 0.005 s(-1), was studied by using optical microscope (OM), scanning electron microscope (SEM) and quantitative X-ray diffraction (XRD) technique. The results show that spherical or rod-shaped delta phase particles in the interior of grains precipitated in the aging treatment disappear during the heating and holding time before deformation, and the content, of delta phase decreases from 8.14% to 7.05%. Dissolution of delta phase occurs during the deformation, and the content of delta phase decreases from 7.05% to 5.14%. The spheroidization of plate-like or needle-like delta phase takes place due to the effect of deformation and dissolution breakages, and the plate-like or needle-like delta phase transferrs to spherical or rod-shaped delta phase. In the centre with the largest strain, the plate-like or needle-like delta phase disappears and spherical or rod-shaped delta phase appears in the interior of grains and grain boundaries.
WOS研究方向	Metallurgy & Metallurgical Engineering
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000274314200008
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/97027]
专题	金属研究所_中国科学院金属研究所
通讯作者	Zhang Shihong
作者单位	Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Zhang Haiyan,Zhang Shihong,Cheng Ming. EVOLUTION OF delta PHASE IN INCONEL 718 ALLOY DURING DELTA PROCESS[J]. ACTA METALLURGICA SINICA,2009,45(12):1451-1455.
APA	Zhang Haiyan,Zhang Shihong,&Cheng Ming.(2009).EVOLUTION OF delta PHASE IN INCONEL 718 ALLOY DURING DELTA PROCESS.ACTA METALLURGICA SINICA,45(12),1451-1455.
MLA	Zhang Haiyan,et al."EVOLUTION OF delta PHASE IN INCONEL 718 ALLOY DURING DELTA PROCESS".ACTA METALLURGICA SINICA 45.12(2009):1451-1455.