PSI - Issue 2_B

Benjamin Sarre et al. / Procedia Structural Integrity 2 (2016) 3569–3576

3571

Benjamin Sarre et al. / Structural Integrity Procedia 00 (2016) 000–000

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Table 1. Chemical composition of the Ti-6Al-4V Elements Ti Al

V

O

H

N

C

Fe

3 . 10 − 3

5 . 510 − 3

wt(%)

Base

6.42

4.02

0.19

0.06

0.15

Table 2. Phase fractions of the fully equiaxed microstructure

α phase

β phase

Mass phase fractions (%)

89

11

Fig. 2. Poles figures of the base metal

Fig. 3. Microstructure of the welded joint, a) Optical micrograph of the welded joint, b) Optical micrograph of the HAZ ( α + α + β ), c) SEM micrograph of the FZ with prior β grain, d) SEM micrograph of the inside of prior β grain

SEM images were acquired with a Cambridge conventional tungsten filament device. Optical micrographs of the welded joint are presented in Fig. 3. Due to the martensitic transformation, the fusion zone has an acicular microstruc-