Effect of Base Material on Microstructure and Texture Evolution of a Ti-6Al-4V Electron-Beam Welded Joint

doi:10.1007/s40195-017-0528-0

Abstract

Abstract:

The effect of base material (BM) on microstructure and crystallographic orientation evolution of a Ti-6Al-4V electron-beam welded joint was investigated. Meanwhile, the crystallographic orientation of prior β grains was studied by advanced electron backscattered diffraction data processing. The inhomogeneity of microstructure within welded joint was formed due to the different microstructures of BM. By comparing microstructure details of the welded joint, including microstructure morphology and crystallographic orientation with those of the base material, it can be found that both the microstructure morphology and crystallographic orientation of the EBW joint would be controlled by BM.

Key words: Electron-beam welding, Titanium alloys, Prior βorientation, Microstructure, Texture

G.Q. Wang, Z.B. Zhao, B.B. Yu, J.R. Liu, Q.J. Wang, J.H. Zhang, R. Yang, J.W. Li. Effect of Base Material on Microstructure and Texture Evolution of a Ti-6Al-4V Electron-Beam Welded Joint[J]. Acta Metallurgica Sinica (English Letters), 2017, 30(5): 499-504.

Figures/Tables 8

Fig. 1 SEM images of the as received Ti-6Al-4V microstructure: a as-cast plate, b bimodal plate

Fig. 2 Macrostructure of electron-beam welded Ti-6Al-4V joint

Fig. 3 Microstructures of the FZ at the side of a the as-cast plate, b bimodal plate

Fig. 4 Microstructures of the HAZ at the side of the as-cast plate, a outer part of the HAZ, b middle of HAZ, c vicinity of FZ

Fig. 5 Microstructures of the HAZ at the side of the bimodal plate, a outer part of the HAZ, b middle of HAZ, c vicinity of FZ

Fig. 6 IPF maps of the zone boxed in Fig. 2: a zone Ι, b zone ΙΙ, c zone ΙΙΙ

Fig. 7 Local α textures in Fig. 6c: a far-HAZ, b near-HAZ, c FZ

Fig. 8 EBSD maps (inverse pole figure colors relative to TD is shown in the upper right corner) of reconstructed β grains within the a zones I, b II in Fig. 2, c EBSD maps of reconstructed β grains of FZ and partly HAZ in the zones III in Fig. 2 and the non-reconstructed region is white, d IPF of reconstructed β grains in TD within FZ in c

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