PHASE TRANSFORMATION MECHANISMS IN BORON ALLOYED TI‐6AL‐4V WELD STUDIED USING BETA GRAIN RECONSTRUCTION
Paper in proceeding, 2024

Substantial effort is put on decreasing the size of both β grains and α colonies of cast, additively manufactured and welded titanium alloys.
To evaluate the effect of these efforts, effective methods to characterize the size and orientation of β grains over relatively large regions
are needed. In the present work the microstructure of a laser weld in cast Ti‐6Al‐4V alloy with 0.11 wt.% boron has been studied. Electron
back scatter diffraction technique was used to capture a low magnification orientation map of the alpha phase across different weld zones.
A method of prior β grain reconstruction based on Burgers orientation relationship was applied to study the prior β grain structure in the
different weld zones. The prior β grain reconstruction could be performed successfully and the reliability of the reconstruction was
evaluated. The fine microstructure in the weld zones together with low magnification resulted in a relatively low indexing rate in the
fusion zone and heat affected zone but this did not affect the quality of prior β grain reconstruction. Analysis of the variant selection and
orientation deviation in the reconstructed β grains can give information about the transformation mechanisms in the different weld zones.

boron

Grain refinement

EBSD

phase transformation

Author

Sakari Tolvanen

Chalmers, Industrial and Materials Science

Robert Pederson

University West

Uta Klement

Chalmers, Industrial and Materials Science, Materials and manufacture

Proceedings of the 15th Workd Conference in Titanium

14 24-29

15th Works Conference in Titanium
Edinburgh, United Kingdom,

Areas of Advance

Production

Subject Categories (SSIF 2011)

Manufacturing, Surface and Joining Technology

Metallurgy and Metallic Materials

DOI

10.7490/f1000research.1119929.1

More information

Latest update

2/25/2025