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PREPARATION OF POWDER METALLURGY Ti-22Al-24Nb-0.5Mo ALLOYS AND ELECTRON BEAM WELDING
Wu Jie; Xu Lei; Lu Zhengguan; Cui Yuyou; Yang Rui
Corresponding AuthorXu Lei(lxu@imr.ac.cn)
2016-09-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume52Issue:9Pages:1070-1078
AbstractTi2AlNb 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.
Keywordhot isostatic pressing powder metallurgy Ti-22Al-24Nb-0.5Mo alloy porosity electron beam welding
DOI10.11900/0412.1961.2016.00019
Indexed BySCI
Language英语
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000383635700006
PublisherSCIENCE PRESS
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/122676
Collection中国科学院金属研究所
Corresponding AuthorXu Lei
AffiliationChinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
Recommended Citation
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.
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