Liquation and post-weld heat treatment cracking in Rene 80 laser repair welds

Date published

2012-01-31T00:00:00Z

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Volume Title

Publisher

Elsevier Science B.V., Amsterdam.

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Type

Article

ISSN

0924-0136

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Citation

Matthew T. Rush, Paul A. Colegrove, Zhu Zhang, David Broad, Liquation and post-weld heat treatment cracking in Rene 80 laser repair welds, Journal of Materials Processing Technology, Volume 212, Issue 1, January 2012, Pages 188–197.

Abstract

An extensive experimental study on a nickel-based superalloy, Rene 80 using autogenous laser welding has been undertaken to determine the effect of the process parameters and weld bead geometry on cracking in the as-welded and post- weld heat treated conditions. Little cracking was observed in the as-welded condition with low powers and beam diameters around 2.5mm. Welding speed had little effect on the incidence of cracking in the as-welded condition. Investigation of the aspect ratio (penetration divided by width) indicated that little cracking occurred in the as-welded condition when the aspect ratio was approximately 0.5. The same effect was observed with the post-weld heat treated samples. An analysis of the microstructures indicated that the cracking was caused primarily by liquation in the as-welded condition and was exacerbated by post-weld heat treatment cracking during the subsequent heat treatment. Finally the study resolved some of the contradictory findings in the literature on the effect of process parameters on the incidence of cracking in the as-welded and post-weld heat treated conditions.

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Software Description

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Github

Keywords

Liquation cracking, Nickel superalloy, Laser welding, Strain-age cracking, Post weld heat treatment cracking, Rene 80, Repair welding, PWHT cracking

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NOTICE: this is the author’s version of a work that was accepted for publication in Journal of Materials Processing Technology Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Materials Processing Technology, VOL 212, ISSUE 1, (2012) DOI:10.1016/j.jmatprotec.2011.09.001

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