MICROSTRUCTURE EVOLUTION AND INTERFACIAL FORMATION MECHANISM OF WIDE GAP BRAZING OF DD5 SINGLE CRYSTAL SUPERALLOY

doi:10.11900/0412.1961.2015.00622

CORC > 金属研究所 > 中国科学院金属研究所

	MICROSTRUCTURE EVOLUTION AND INTERFACIAL FORMATION MECHANISM OF WIDE GAP BRAZING OF DD5 SINGLE CRYSTAL SUPERALLOY
	Sun Yuan; Liu Jide; Hou Xingyu; Wang Guanglei; Yang Jinxia; Jin Tao; Zhou Yizhou
刊名	ACTA METALLURGICA SINICA
	2016-07-01
卷号	52 期号:7 页码:875-882
关键词	single crystal superalloy wide gap brazing mixed powder filler alloy microstructure mechanical property
ISSN号	0412-1961
DOI	10.11900/0412.1961.2015.00622
通讯作者	Zhou Yizhou(yzzhou@imr.ac.cn)
英文摘要	Ni-based single-crystal superalloy DD5 has excellent high temperature properties, which is the preferred raw material for aero-engine turbine blade in recent year. In this research, DD5 superalloy was brazed by different contents of Ni-Co-Cr-W-B+DD99 mixed powder filler alloy. The microstructure evolution and interfacial formation mechanism of DD5 superalloy brazing joint were analyzed by SEM and EPMA. The mechanical properties of joint after solid solution treatment and aging treatment were tested. The results show that gamma-Ni primary phase formed firstly in the Ni-Co-Cr-W-B/DD99 interface during the brazing process, and then B element segregated and precipitated to fine granular M3B2 type boride. The residual liquid phase solidified and formed lastly to the M3B2 phase, gamma+gamma' eutectic phase and gamma-Ni+Ni3B+CrB eutectic phase during cooling. With increasing the ratio of DD99 in mixed powder filler alloy, the low melting point eutectic phase and borides in the joint decrease and the uniformity of composition and microstructure of joint improve. When the ratio of DD99 increased to 70% (mass fraction) in the mixed powder filler alloy, it can be observed that element of B diffused to DD99 additive powder which resulted in the decrease of low melting point eutectic phases and brittle compounds. The high temperature tensile properties of joint is 1010 MPa at 870 degrees C.
资助项目	National Natural Science Foundation of China[51401210] ; National Natural Science Foundation of China[51331005] ; High Technology Research and Development Program of China[2014AA041701]
WOS研究方向	Metallurgy & Metallurgical Engineering
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000385747800013
资助机构	National Natural Science Foundation of China ; High Technology Research and Development Program of China
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/123039]
专题	金属研究所_中国科学院金属研究所
通讯作者	Zhou Yizhou
作者单位	Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Sun Yuan,Liu Jide,Hou Xingyu,et al. MICROSTRUCTURE EVOLUTION AND INTERFACIAL FORMATION MECHANISM OF WIDE GAP BRAZING OF DD5 SINGLE CRYSTAL SUPERALLOY[J]. ACTA METALLURGICA SINICA,2016,52(7):875-882.
APA	Sun Yuan.,Liu Jide.,Hou Xingyu.,Wang Guanglei.,Yang Jinxia.,...&Zhou Yizhou.(2016).MICROSTRUCTURE EVOLUTION AND INTERFACIAL FORMATION MECHANISM OF WIDE GAP BRAZING OF DD5 SINGLE CRYSTAL SUPERALLOY.ACTA METALLURGICA SINICA,52(7),875-882.
MLA	Sun Yuan,et al."MICROSTRUCTURE EVOLUTION AND INTERFACIAL FORMATION MECHANISM OF WIDE GAP BRAZING OF DD5 SINGLE CRYSTAL SUPERALLOY".ACTA METALLURGICA SINICA 52.7(2016):875-882.