Microstructural development during Linear Friction Welding of titanium alloys

M. M. Attallah, M. Preuss, S. Bray

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

15 Citations (Scopus)

Abstract

The application of Linear Friction Welding (LFW) to aerospace Ti-alloys components offers significant weight reduction and cost saving advantages. The severe thermomechanical deformation associated with LFW results in a localised, yet complex microstructural development, which is the subject of the present investigation. In this work, the microstructural and microhardness developments due to LFW of β-forged Ti-6246 were investigated. Metallurgical characterisation of the welds was performed using scanning electron microscopy (including electron backscatter diffraction) and microhardness. It was found that the thermomechanical deformation in the weld resulted in the formation of dynamically recrystallised metastable β-phase in the weld, which indicates that welding at the weld line occurred above the β-transus regardless of welding parameters. The width of the dynamically-recrystallised β-region, and the β-grain size was found to decrease with the increase in the consolidation (forging) pressure applied during LFW. Following post-weld heat treatment, fine α-precipitates were found to form in the weld line, resulting in a sharp increase in hardness.

Original languageEnglish
Title of host publicationTrends in Welding Research - Proceedings of the 8th International Conference
Pages486-491
Number of pages6
DOIs
Publication statusPublished - 2009
Externally publishedYes
EventInternational Conference on Trends in Welding Research 2008 - Pine Mountain, United States of America
Duration: 1 Jun 20086 Jun 2008
Conference number: 8th

Publication series

NameASM Proceedings of the International Conference: Trends in Welding Research

Conference

ConferenceInternational Conference on Trends in Welding Research 2008
CountryUnited States of America
CityPine Mountain
Period1/06/086/06/08

Cite this