Microstructure and tensile properties of DD32 single crystal Ni-base superalloy repaired by laser metal forming

doi:10.1016/j.jmst.2020.01.003

IMR OpenIR

	Microstructure and tensile properties of DD32 single crystal Ni-base superalloy repaired by laser metal forming
其他题名	Microstructure and tensile properties of DD32 single crystal ni-base superalloy repaired by laser metal forming
	Shiwei Ci 1; Jingjing Liang 1; Jinguo Li 1; Yizhou Zhou 1; Xiaofeng Sun 1
	2020
发表期刊	材料科学技术:英文版
ISSN	1005-0302
卷号	42.0 期号:010 页码:23-34
摘要	In this work,the microstructure and tensile properties of DD32 single-crystal(SC)superalloy repaired by laser metal forming(LMF)using pulsed laser have been studied in detail.The microstructures of the deposited samples and the tensile-ruptured samples were characterized by optical microscopy(OM),transmission electron microscope(TEM)and scanning electron microscope(SEM).Due to high cooling rate,the primary dendrite spacing in the deposited area(17.2μm)was apparently smaller than that in the substrate area(307μm),and the carbides in the deposited samples were also smaller compared with that in the substrate area.The formation of(γ+γ’)eutectic in the initial layer of repaired SC was inhibited because of the high cooling rate.As the deposition proceeded,the cooling rate decreased,and the(γ+γ’)eutectic increased gradually.The(γ+γ’)eutectic at heat-affected zone(HAZ)in the molten pool dissolved partly because of the high temperature at HAZ,but there were still residual eutectics.Tensile test results showed that tensile behavior of repaired SC at different temperatures was closely related to the MC carbides,solidification porosity,γ’phase,and(γ+γ’)eutectic.At moderate temperature,the samples tested fractured preferentially at the substrate area due to the fragmentation of the coarse MC carbide in the substrate area.At elevated temperature,the(γ+γ’)eutectic and solidification porosity in the deposited area became the source of cracks,which deteriorated the high-temperature properties and made the samples rupture at the deposited area preferentially.
关键词	DD32 Pulsed-laser Repairing Single-crystal superalloy Microstructures Tensile property
DOI	10.1016/j.jmst.2020.01.003
收录类别	CSCD
语种	中文
资助项目	[National Key R&D Program of China] ; [National Natural Science Foundation of China (NSFC)] ; [National High TechnologyResearch and Development Program ("863")] ; [Fund of the State Key Laboratory of Solidification Processing in NWPU]
WOS记录号	WOS:000526956200003
CSCD记录号	CSCD:6758220
引用统计	被引频次：50[WOS] [WOS记录] [WOS相关记录] 被引频次：12[CSCD] [CSCD记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/90103
专题	中国科学院金属研究所
作者单位	1.中国科学院金属研究所 2.School of Materials Science and Engineering,University of Science and Technology of China 3.State Key Laboratory of Solidification Processing,Northwestern Polytechnical University 4.Space Manufacturing Technology(CAS Key Lab
推荐引用方式 GB/T 7714	Shiwei Ci,Jingjing Liang,Jinguo Li,et al. Microstructure and tensile properties of DD32 single crystal Ni-base superalloy repaired by laser metal forming[J]. 材料科学技术:英文版,2020,42.0(010):23-34.
APA	Shiwei Ci,Jingjing Liang,Jinguo Li,Yizhou Zhou,&Xiaofeng Sun.(2020).Microstructure and tensile properties of DD32 single crystal Ni-base superalloy repaired by laser metal forming.材料科学技术:英文版,42.0(010),23-34.
MLA	Shiwei Ci,et al."Microstructure and tensile properties of DD32 single crystal Ni-base superalloy repaired by laser metal forming".材料科学技术:英文版 42.0.010(2020):23-34.