Microstructure and tensile properties of laser welded dissimilar Ti-22Al-27Nb and TA15 joints

Zhang, Kezhao; Ni, Longchang; Lei, Zhenglong; Chen, Yanbin; Hu, Xinyu

doi:10.1007/s00170-016-8579-3

Cited by 14 publications

(6 citation statements)

References 14 publications

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“…With the further increase of Nb content, the upper temperature limit of the forming O phase increased and the alloy had a larger phase region of O + B2 phases [29][30][31]; hence, the O phase precipitated in the weld rich in Nb. Nb has an effect on the martensite transformation temperature and it reduces with increasing Nb content [25]. The martensite disappearing in the weld rich in Nb can be explained by its transformation temperature being well-below room temperature.…”

Section: Microstructures Of Laser-welded Jointsmentioning

confidence: 98%

“…Then, the heat was mainly transferred along the depth direction to increase the depth of penetration [23], thus producing a laminar line parallel to the fusion line. In addition, the periodic changes of heat input and the release of latent heat of crystallization resulted in forming multiple laminar lines parallel to the fusion line during the welding process [24,25]. When the heat was transferred to the bottom of the weld pool, the direction of heat transfer was transformed from the longitudinal direction to the cross direction, thus forming a semi-circular shape at bottom of the weld, which increased the weld width at the bottom of the weld.…”

Section: Microstructures Of Laser-welded Jointsmentioning

confidence: 99%

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Microstructures and Mechanical Properties of a Laser-Welded Joint of Ti3Al-Nb Alloy Using Pure Nb Filler Metal

Wang

Sun

et al. 2018

Metals

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Ti3Al-Nb alloy (Ti-24Al-15Nb) was welded by a pulsed laser welding system without and with pure Nb filler metal. The results indicated that pure Nb filler metal had profound effects on the microstructures and mechanical properties of the laser-welded joints. The joint without filler metal consisted of the weld zone (α’2 + B2), heat affected zone HAZ1 (α2 + B2), HAZ2 (α2 + O + B2) and base metal (α2 + O + B2), and gas pores were generated in the weld resulting in the deterioration of the joint strength (330 MPa) and elongation (1.9%). When the Nb filler metal was used, the weld microstructure (NbTi solid solution + O + B2) was obtained, and the joint properties were significantly improved, which was associated with the strengthening effect of the NbTi solid solution, O phase precipitation and the slip transmission between O and B2 phases, and the restraining of the formation of martensite (α’2) and gas pores in the weld. The strength (724 MPa) and elongation (5.1%) of the joint increased by 119.4% and 168.4% compared with those of the joint without filler metal, and the joint strength was able to reach 81.7% of the base metal strength (886 MPa). It is favorable to use pure Nb filler metal for improving the mechanical properties of laser-welded Ti3Al-Nb alloy joints.

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Section: Microstructures Of Laser-welded Jointsmentioning

confidence: 98%

Section: Microstructures Of Laser-welded Jointsmentioning

confidence: 99%

Microstructures and Mechanical Properties of a Laser-Welded Joint of Ti3Al-Nb Alloy Using Pure Nb Filler Metal

Wang

Sun

et al. 2018

Metals

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“…Irrespective of welding position, all welds that fractured through the base metal had greater ductility than those that fractured through the weld metal. This is because the martensite of the weld metal has worse ductility than the phases (α + β) of the base metal Ti6Al4V, as previously reported [17][18][19][20][21][22][23]. In addition, as porosity is to the detriment of the ductility of welds when its amount reaches a certain limit [24], the great amount of porosity present in the horizontal welds could make the ductility even worse.…”

Section: Effects Of Welding Position On Static Tensile Propertiesmentioning

confidence: 93%

A Comparative Study on the Laser Welding of Ti6Al4V Alloy Sheets in Flat and Horizontal Positions

Chang

Zhang

et al. 2017

Applied Sciences

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Laser welding has been increasingly utilized to manufacture a variety of components thanks to its high quality and speed. For components with complex shapes, the welding position needs be continuously adjusted during laser welding, which makes it necessary to know the effects of the welding position on the quality of the laser welds. In this paper, the weld quality under two (flat and horizontal) welding positions were studied comparatively in the laser welding of Ti6Al4V titanium alloy, in terms of weld profiles, process porosity, and static tensile strengths. Results show that the flat welding position led to better weld profiles, less process porosity than that of the horizontal welding position, which resulted from the different actions of gravity on the molten weld metals and the different escape routes for pores under different welding positions. Although undercuts showed no association with the fracture positions and tensile strengths of the welds, too much porosity in horizontal laser welds led to significant decreases in the strengths and specific elongations of welds. Higher laser powers and travel speeds were recommended, for both flat and horizontal welding positions, to reduce weld porosity and improve mechanical properties.

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“…The welds obtained at RT and 400 • С had a bright silvery weld bead and seam root (Fig. 4a and b) that indicated an absence of oxidation [26]. Upon pre-heating to 600 • C, the weld exhibited a yellowish tint (Fig.…”

Section: Weld Seam Appearancementioning

confidence: 99%

Effect of pre-heating and post-weld heat treatment on structure and mechanical properties of laser beam-welded Ti2AlNb-based joints

et al. 2022

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Microstructure and tensile properties of laser welded dissimilar Ti-22Al-27Nb and TA15 joints

Cited by 14 publications

References 14 publications

Microstructures and Mechanical Properties of a Laser-Welded Joint of Ti3Al-Nb Alloy Using Pure Nb Filler Metal

Microstructures and Mechanical Properties of a Laser-Welded Joint of Ti3Al-Nb Alloy Using Pure Nb Filler Metal

A Comparative Study on the Laser Welding of Ti6Al4V Alloy Sheets in Flat and Horizontal Positions

Effect of pre-heating and post-weld heat treatment on structure and mechanical properties of laser beam-welded Ti2AlNb-based joints

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