Investigation on Eutectic Dissolution Behavior of Single Crystal Superalloy by Differential Scanning Calorimetry

doi:10.11900/0412.1961.2021.00093

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	Investigation on Eutectic Dissolution Behavior of Single Crystal Superalloy by Differential Scanning Calorimetry
	Zhang Shaohua; Xie Guang; Dong Jiasheng; Lou Langhong
刊名	ACTA METALLURGICA SINICA
	2021-12-01
卷号	57 期号:12 页码:1559-1566
关键词	single crystal superalloy differential scanning calorimetry solution heat treatment eutectic phase transition
ISSN号	0412-1961
DOI	10.11900/0412.1961.2021.00093
通讯作者	Zhang Shaohua(zhangshaohua@imr.ac.cn)
英文摘要	Ni-based single crystal (SX) superalloys are used for the production of blades in gas turbines and aircraft engines because of their superior mechanical performance at high temperatures. To improve the temperature capabilities of modern SX superalloys, specific refractory elements are added to the alloys. This leads to micro-segregation in alloys, requiring a complex heat treatment process to eliminate gamma/gamma' eutectic. Therefore, the dissolution process of gamma/gamma' eutectic must be understood. In this study, a second-generation Ni-based SX superalloy was used to investigate the effect of extended holding time at 1290 degrees C and 1300 degrees C on the gamma' phase dissolving temperature (T-gamma ') and gamma/gamma'eutectic phase-melting temperature (T-gamma/gamma '), respectively. The method involves measuring the differential heating curves of as-cast and as heat-treated samples using DSC. The results showed that T-gamma ' and T-gamma/gamma ' increased at a holding time of 2 h. However, with an increase in the holding time, the temperature increase was not obvious. The volume fraction of gamma/gamma' eutectic decreased with the extended holding at 1300 degrees C, while the volume fraction of gamma/gamma' eutectic increased after holding at 1290 degrees C for 8 h. This abnormal phenomenon was confirmed by the metallographic experiments. The analyses showed that the increase in the eutectic volume fraction was due to the incomplete dissolution of coarse gamma' phase at the inter-dendritic region, which resulted in the diffusion
WOS研究方向	Metallurgy & Metallurgical Engineering
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000743827800003
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/173641]
专题	金属研究所_中国科学院金属研究所
通讯作者	Zhang Shaohua
作者单位	Chinese Acad Sci, Inst Met Res, Shi Changxu Innovat Ctr Adv Mat, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Zhang Shaohua,Xie Guang,Dong Jiasheng,et al. Investigation on Eutectic Dissolution Behavior of Single Crystal Superalloy by Differential Scanning Calorimetry[J]. ACTA METALLURGICA SINICA,2021,57(12):1559-1566.
APA	Zhang Shaohua,Xie Guang,Dong Jiasheng,&Lou Langhong.(2021).Investigation on Eutectic Dissolution Behavior of Single Crystal Superalloy by Differential Scanning Calorimetry.ACTA METALLURGICA SINICA,57(12),1559-1566.
MLA	Zhang Shaohua,et al."Investigation on Eutectic Dissolution Behavior of Single Crystal Superalloy by Differential Scanning Calorimetry".ACTA METALLURGICA SINICA 57.12(2021):1559-1566.