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Investigation of In Situ and Conventional Post‐Weld Heat Treatments on Dual‐Laser‐Beam‐Welded γ‐TiAl‐Based Alloy
Author(s) -
Liu Jie,
Ventzke Volker,
Staron Peter,
Schell Norbert,
Kashaev Nikolai,
Huber Norbert
Publication year - 2012
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201200113
Subject(s) - welding , materials science , microstructure , residual stress , metallurgy , heat affected zone , laser beam welding , alloy , in situ , electric resistance welding , composite material , physics , meteorology
This paper describes a way to improve the microstructure and mechanical properties of welding seams by in situ and conventional post‐weld heat treatments for laser beam welding of the Ti–45Al–5Nb–0.2C–0.2B alloy. The seams are crack‐free with reduced longitudinal residual stress and higher elongation to fraction after post‐weld heat treatment. The welding zone consists of α 2 after welding, transforms to a massive γ during in situ post‐weld heat treatment, and finally forms a convoluted microstructure after conventional heating. The phase composition across the welding zone is discussed.