On post-weld heat treatment cracking in tig welded superalloy ATI 718Plus

On post-weld heat treatment cracking in tig welded superalloy ATI 718Plus

The susceptibility of heat affected zone (HAZ) to cracking in Tungsten Inert Gas (TIG) welded Allvac 718Plus superalloy during post-weld heat treatment (PWHT) was studied. Contrary to the previously reported case of low heat input electron beam welded Allvac 718Plus, where HAZ cracking occurred duri...

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Bibliographic Details
Published in:Results in physics Vol. 6; pp. 196 - 198
Main Authors: Asala, G., Ojo, O.A.
Format: Journal Article
Language:English
Published: Elsevier B.V 2016
Elsevier
Subjects:
Joining
Post-weld heat treatment
Superalloy
Post-weld heat treatment
Superalloy
Joining
Online Access:Get full text
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Summary:The susceptibility of heat affected zone (HAZ) to cracking in Tungsten Inert Gas (TIG) welded Allvac 718Plus superalloy during post-weld heat treatment (PWHT) was studied. Contrary to the previously reported case of low heat input electron beam welded Allvac 718Plus, where HAZ cracking occurred during PWHT, the TIG welded alloy is crack-free after PWHT, notwithstanding the presence of similar micro-constituents that caused cracking in the low input weld. Accordingly, the formation of brittle HAZ intergranular micro-constituents may not be a sufficient factor to determine cracking propensity, the extent of heat input during welding may be another major factor that influences HAZ cracking during PWHT of the aerospace superalloy Allvac 718Plus.
ISSN:2211-3797
2211-3797
DOI:10.1016/j.rinp.2016.03.011