The Evolution of Ti‐6Al‐4V Following Extreme Thermo‐Mechanical Processing

Owen, C. J.; Jeffs, Spencer; Perkins, Karen; Bray, S.

doi:10.1002/9781119296126.ch71

Cited by 2 publications

(2 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The maximum tensile residual stress measured by the contour method, + 755 MPa, was found to be located within a secondary HAZ identified near the outer surface of Ring 2 in the FZ. This is attributed to the secondary cosmetic pass applied to the ring, and coincides with the observation of ghost α. Additionally, as shown by Owen et al [31], an increase in ghost α volume fraction can lead to an increased hardness compared with α′. This correlates well with the observed increase in microhardness results over the secondary HAZ, providing further evidence to support the observation of ghost α.…”

Section: Discussionsupporting

confidence: 84%

Measurements of residual stress and microstructural evolution in electron beam welded Ti-6Al-4V using multiple techniques

Rae

Lomas

Jackson

et al. 2017

Materials Characterization

View full text Add to dashboard Cite

The evolution of residual stress and microstructure has been investigated in electron-beam welded Ti-6Al-4V alloy rings in order to develop an understanding of how the distribution of through-thickness residual stress correlates with microstructural evolution. A multiple technique approach to residual stress measurement was employed using a combination of different measurement techniques including X-ray diffraction (XRD), hole drilling method based on electronic speckle pattern interferometry (ESPI), and the contour method. It was found that there is a strong correlation between the change in residual stress and alpha phase morphology across the weld. The fusion zone exhibited highly tensile residual stress which was typified by an entirely acicular α′ microstructure formed by a displacive transformation within prior β grains on cooling. The tensile residual stress in the centre of the weld reduced towards the heat affected zone, transitioning to a compressive residual stress upon increasing distance from the weld centre. The transition from tensile to compressive residual stress correlates with a significant decrease in the volume fraction of α′ and an increase in the bimodal morphology of equiaxed primary alpha in a diffusional transformed beta matrix leading to elongated alpha in the base material

show abstract