Stray grain formation in nickel-base superalloy single-crystal welds

J. M. Vitek, S. S. Babu, J. W. Park, S. A. David

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

A single-crystal nickel-based superalloy (alloy Rene N5) was welded using laser and electron beam processes. The resultant microstructure was examined by optical microscopy. It was found that extensive stray grain formation took place, and furthermore, the stray grain formation was not symmetrical with respect to the weld centerline. The results were interpreted with the use of the theories of Kurz and co-workers on dendrite tip growth and constitutional supercooling ahead of the advancing dendrite solidification front. It was found that the theories explain the observations quite well, and provide the basis for optimizing the weld conditions in the future so as to yield stray-grain free welds in single crystals.

Original languageEnglish
Title of host publicationSolidification Processes and Microstructures
Subtitle of host publicationA Symposium in Honor of Wilfried Kurz
EditorsM. Rappaz, C. Beckermann, R. Trivedi
Pages61-66
Number of pages6
Publication statusPublished - 2004 Jul 14
EventSolidification Processes and Microstructures: A Symposium in Honor of Wilfried Kurz - Charlotte, NC., United States
Duration: 2004 Mar 142004 Mar 18

Publication series

NameSolidification Processes and Microstructures: A Symposium in Honor of Wilfried Kurz

Other

OtherSolidification Processes and Microstructures: A Symposium in Honor of Wilfried Kurz
CountryUnited States
CityCharlotte, NC.
Period04/3/1404/3/18

Fingerprint

Superalloys
Welds
Nickel
Single crystals
Supercooling
Dendrites (metallography)
Optical microscopy
Laser beams
Solidification
Electron beams
Microstructure

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Vitek, J. M., Babu, S. S., Park, J. W., & David, S. A. (2004). Stray grain formation in nickel-base superalloy single-crystal welds. In M. Rappaz, C. Beckermann, & R. Trivedi (Eds.), Solidification Processes and Microstructures: A Symposium in Honor of Wilfried Kurz (pp. 61-66). (Solidification Processes and Microstructures: A Symposium in Honor of Wilfried Kurz).
Vitek, J. M. ; Babu, S. S. ; Park, J. W. ; David, S. A. / Stray grain formation in nickel-base superalloy single-crystal welds. Solidification Processes and Microstructures: A Symposium in Honor of Wilfried Kurz. editor / M. Rappaz ; C. Beckermann ; R. Trivedi. 2004. pp. 61-66 (Solidification Processes and Microstructures: A Symposium in Honor of Wilfried Kurz).
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abstract = "A single-crystal nickel-based superalloy (alloy Rene N5) was welded using laser and electron beam processes. The resultant microstructure was examined by optical microscopy. It was found that extensive stray grain formation took place, and furthermore, the stray grain formation was not symmetrical with respect to the weld centerline. The results were interpreted with the use of the theories of Kurz and co-workers on dendrite tip growth and constitutional supercooling ahead of the advancing dendrite solidification front. It was found that the theories explain the observations quite well, and provide the basis for optimizing the weld conditions in the future so as to yield stray-grain free welds in single crystals.",
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Vitek, JM, Babu, SS, Park, JW & David, SA 2004, Stray grain formation in nickel-base superalloy single-crystal welds. in M Rappaz, C Beckermann & R Trivedi (eds), Solidification Processes and Microstructures: A Symposium in Honor of Wilfried Kurz. Solidification Processes and Microstructures: A Symposium in Honor of Wilfried Kurz, pp. 61-66, Solidification Processes and Microstructures: A Symposium in Honor of Wilfried Kurz, Charlotte, NC., United States, 04/3/14.

Stray grain formation in nickel-base superalloy single-crystal welds. / Vitek, J. M.; Babu, S. S.; Park, J. W.; David, S. A.

Solidification Processes and Microstructures: A Symposium in Honor of Wilfried Kurz. ed. / M. Rappaz; C. Beckermann; R. Trivedi. 2004. p. 61-66 (Solidification Processes and Microstructures: A Symposium in Honor of Wilfried Kurz).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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AB - A single-crystal nickel-based superalloy (alloy Rene N5) was welded using laser and electron beam processes. The resultant microstructure was examined by optical microscopy. It was found that extensive stray grain formation took place, and furthermore, the stray grain formation was not symmetrical with respect to the weld centerline. The results were interpreted with the use of the theories of Kurz and co-workers on dendrite tip growth and constitutional supercooling ahead of the advancing dendrite solidification front. It was found that the theories explain the observations quite well, and provide the basis for optimizing the weld conditions in the future so as to yield stray-grain free welds in single crystals.

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Vitek JM, Babu SS, Park JW, David SA. Stray grain formation in nickel-base superalloy single-crystal welds. In Rappaz M, Beckermann C, Trivedi R, editors, Solidification Processes and Microstructures: A Symposium in Honor of Wilfried Kurz. 2004. p. 61-66. (Solidification Processes and Microstructures: A Symposium in Honor of Wilfried Kurz).