PREPARATION OF POWDER METALLURGY Ti-22Al-24Nb-0.5Mo ALLOYS AND ELECTRON BEAM WELDING

doi:10.11900/0412.1961.2016.00019

CORC > 金属研究所 > 中国科学院金属研究所

	PREPARATION OF POWDER METALLURGY Ti-22Al-24Nb-0.5Mo ALLOYS AND ELECTRON BEAM WELDING
	Wu Jie; Xu Lei; Lu Zhengguan; Cui Yuyou; Yang Rui
刊名	ACTA METALLURGICA SINICA
	2016-09-11
卷号	52 期号:9 页码:1070-1078
关键词	hot isostatic pressing powder metallurgy Ti-22Al-24Nb-0.5Mo alloy porosity electron beam welding
ISSN号	0412-1961
DOI	10.11900/0412.1961.2016.00019
通讯作者	Xu Lei(lxu@imr.ac.cn)
英文摘要	Ti2AlNb alloys are considered as a potential structural material for high temperature applications like gas turbine engine components due to their high specific strength and good creep resistance. In this work, pre alloyed powder of Ti-22Al-24Nb-0.5Mo (atomic fraction, %) was prepared by an electrode induction melting gas atomization process and powder metallurgy (PM) alloys was made through a hot isostatic pressing (HIPing) route. PM Ti-22Al-24Nb-0.5Mo rings and plates were welded by electron beam welding (EBW). The microstructure of the welded joints was investigated by OM, SEM, EPMA and X-ray tomography. The effect of post-weld heat treatments (PWHT) on the microhardness, tensile properties and rupture lifetime at 650 degrees C, 360 MPa of the welding joint of PM Ti-22Al-24Nb-0.5Mo plate was also studied. The results show that the HIPing temperature will affect the porosity distribution of PM Ti-22Al-24Nb-0.5Mo alloys. The PM Ti-22Al-24Nb-0.5Mo rings HIPed at 1030 degrees C after 980 degrees C, 2 h, vacuum furnace cooling show good weldability. The fusion zone (FZ), heat affected zone (HAZ) and base metal (BM) of welded joints show homogeneous chemical composition. The microstructures of FZ, HAZ and BM are different while the microhardnesses of FZ, HAZ and BM show no obvious differences. Tensile and stress rupture lifetime testing specimens all fracture in the FZ. It is found that there are a certain number of micro porosity in the FZ of the welded joints. However, the porosity reduces after PWHT, which will improve the high temperature ductility and rupture properties of the PM Ti-22Al-24Nb-0.5Mo welded joints.
WOS研究方向	Metallurgy & Metallurgical Engineering
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000383635700006
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/122675]
专题	金属研究所_中国科学院金属研究所
通讯作者	Xu Lei
作者单位	Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Wu Jie,Xu Lei,Lu Zhengguan,et al. PREPARATION OF POWDER METALLURGY Ti-22Al-24Nb-0.5Mo ALLOYS AND ELECTRON BEAM WELDING[J]. ACTA METALLURGICA SINICA,2016,52(9):1070-1078.
APA	Wu Jie,Xu Lei,Lu Zhengguan,Cui Yuyou,&Yang Rui.(2016).PREPARATION OF POWDER METALLURGY Ti-22Al-24Nb-0.5Mo ALLOYS AND ELECTRON BEAM WELDING.ACTA METALLURGICA SINICA,52(9),1070-1078.
MLA	Wu Jie,et al."PREPARATION OF POWDER METALLURGY Ti-22Al-24Nb-0.5Mo ALLOYS AND ELECTRON BEAM WELDING".ACTA METALLURGICA SINICA 52.9(2016):1070-1078.