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

doi:10.11900/0412.1961.2016.00019

Acta Metall Sin

2016, Vol. 52

Issue (9): 1070-1078 DOI: 10.11900/0412.1961.2016.00019

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

Jie WU,Lei XU(

),Zhengguan LU,Yuyou CUI,Rui YANG

Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Cite this article:

Jie WU,Lei XU,Zhengguan LU,Yuyou CUI,Rui YANG. PREPARATION OF POWDER METALLURGY Ti-22Al-24Nb-0.5Mo ALLOYS ANDELECTRON BEAM WELDING. Acta Metall Sin, 2016, 52(9): 1070-1078.

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Abstract

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 ℃, 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 ℃ after 980 ℃, 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.

Key words: hot isostatic pressing powder metallurgy Ti-22Al-24Nb-0.5Mo alloy porosity electron beam welding

Received: 08 January 2016

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	Jie WU
	Lei XU
	Zhengguan LU
	Yuyou CUI
	Rui YANG

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https://www.ams.org.cn/EN/10.11900/0412.1961.2016.00019 OR https://www.ams.org.cn/EN/Y2016/V52/I9/1070

Fig.1 Rings (a) and plate (b) of powder metallurgy Ti-22Al-24Nb-0.5Mo alloys after electron beam welding

Fig.2 Schematics of the specimens of as-welded powder metallurgy Ti-22Al-24Nb-0.5Mo alloys for tensile tests (a) and rupture lifetime tests at 650 ^oC and 360 MPa (b) (unit: mm, FZ—fusion zone)

Fig.3 SEM images of Ti-22Al-24Nb-0.5Mo pre-alloyed powders in full view (a) and high-magnification of Fig.3a (b)

Fig.4 XRD spectrum of Ti-22Al-24Nb-0.5Mo pre-alloyed powder

Fig.5 Micro- porosity distribution of PM Ti- 22Al- 24Nb-0.5Mo alloys under different HIP temperatures^[11]

Table 1 Chemical compositions of Ti-22Al-24Nb-0.5Mo pre-alloyed powders and as-HIPed compacts (mass fraction / %)

Fig.6 OM images (a, b) and corresponding X-ray inspections (c, d) of as-welded joints of the HIPed (a, c) and heat-treated (b, d) Ti-22Al-24Nb-0.5Mo alloys

Fig.7 The microstructure (a), Al distribution (b) and Nb distribution (c) of as-welded powder metallurgy Ti-22Al-24Nb-0.5Mo alloys joints (HAZ—heat affected zone, BM—base metal)

Fig.8 Microhardness distributions of powder metallurgy Ti-22Al-24Nb-0.5Mo alloys joints at as-welded state (a) and as-welded + PWHT state (b) (PWHT—post-weld heat treatment)

Table 2 Mechanical properties of powder metallurgy Ti-22Al-24Nb-0.5Mo alloys electron beam welded joints

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