Microstructure and Mechanical Properties of Electron Beam Welded Titanium Alloy Ti-6246

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	Microstructure and Mechanical Properties of Electron Beam Welded Titanium Alloy Ti-6246
	Wang, GQ; Chen, ZY; Li, JW; Liu, JR; Wang, QJ; Yang, R; Chen, ZY (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.
刊名	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
	2018-03-01
卷号	34 期号:3 页码:570-576
关键词	Metal Ti-6al-4v Friction Toughness Behavior Ti6246
ISSN号	1005-0302
英文摘要	Electron beam welding (EBW) was applied to a 10-mm-thick plate cut from Ti-6246 compressor disk. The microstructural characteristics, microhardness and room temperature tensile properties were investigated. Microstructure observations indicated that there existed plenty of thin needle-like alpha platelets studding in the matrix of the columnar beta grains in the as-welded fusion zone (FZ). Post-weld heat treatment (PWHT) led to the precipitation of small secondary alpha platelets in the beta matrix in heat affected zone and FZ. The thickness and the density of alpha platelets increased as the temperature of PWHT increased from 545 to 645 degrees C. The microhardness across the Ti-6246 EBW joint exhibited a nonuniform distribution. The hardness increased with the decrease of distance to the weld center, and reached the maximum of 467 HV in FZ when PWHT was carried out at 595 degrees C. All the weldments tested with tension were fractured at the base material (BM) and exhibited a ductile fracture mode. The major deformation barrier in BM was the platelet alpha/beta interfaces, however, the major deformation barrier in FZ was found to be beta grain boundaries and secondary alpha/beta interfaces. The BM with thicker platelet alpha phases had lower strength than the other two zones in the joint, and the BM deformed first and led to fracture in this zone. (C) 2016 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.; Electron beam welding (EBW) was applied to a 10-mm-thick plate cut from Ti-6246 compressor disk. The microstructural characteristics, microhardness and room temperature tensile properties were investigated. Microstructure observations indicated that there existed plenty of thin needle-like alpha platelets studding in the matrix of the columnar beta grains in the as-welded fusion zone (FZ). Post-weld heat treatment (PWHT) led to the precipitation of small secondary alpha platelets in the beta matrix in heat affected zone and FZ. The thickness and the density of alpha platelets increased as the temperature of PWHT increased from 545 to 645 degrees C. The microhardness across the Ti-6246 EBW joint exhibited a nonuniform distribution. The hardness increased with the decrease of distance to the weld center, and reached the maximum of 467 HV in FZ when PWHT was carried out at 595 degrees C. All the weldments tested with tension were fractured at the base material (BM) and exhibited a ductile fracture mode. The major deformation barrier in BM was the platelet alpha/beta interfaces, however, the major deformation barrier in FZ was found to be beta grain boundaries and secondary alpha/beta interfaces. The BM with thicker platelet alpha phases had lower strength than the other two zones in the joint, and the BM deformed first and led to fracture in this zone. (C) 2016 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
学科主题	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/321006/79450]
专题	金属研究所_中国科学院金属研究所
通讯作者	Chen, ZY (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.
推荐引用方式 GB/T 7714	Wang, GQ,Chen, ZY,Li, JW,et al. Microstructure and Mechanical Properties of Electron Beam Welded Titanium Alloy Ti-6246[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2018,34(3):570-576.
APA	Wang, GQ.,Chen, ZY.,Li, JW.,Liu, JR.,Wang, QJ.,...&Chen, ZY .(2018).Microstructure and Mechanical Properties of Electron Beam Welded Titanium Alloy Ti-6246.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,34(3),570-576.
MLA	Wang, GQ,et al."Microstructure and Mechanical Properties of Electron Beam Welded Titanium Alloy Ti-6246".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 34.3(2018):570-576.