Weldability and microstructure development in nickel-base superalloys

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The integrity of nickel-base superalloy single-crystal welds depends on the weld cracking tendency, weld metal dendrite selection process, stray crystal formation, and macro- and microstructure development. These phenomena have been investigated in commercial nickel-base superalloy single crystal welds. During electron beam and laser beam welding, transverse and longitudinal weld cracking occurred. However, the weld cracking tendency was reduced with preheating. Most of the dendritic growth pattern development in these welds can be explained by a geometric model. However, the welds also contained misoriented stray crystals, which were frequently associated with weld cracks. The formation of stray crystals was related to ... continued below

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30 p.

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David, S.A.; Babu, S.S. & Vitek, J.M. November 1, 1997.

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Description

The integrity of nickel-base superalloy single-crystal welds depends on the weld cracking tendency, weld metal dendrite selection process, stray crystal formation, and macro- and microstructure development. These phenomena have been investigated in commercial nickel-base superalloy single crystal welds. During electron beam and laser beam welding, transverse and longitudinal weld cracking occurred. However, the weld cracking tendency was reduced with preheating. Most of the dendritic growth pattern development in these welds can be explained by a geometric model. However, the welds also contained misoriented stray crystals, which were frequently associated with weld cracks. The formation of stray crystals was related to thermal and constitutional supercooling effects. Fine-scale elemental partitioning between {gamma} and {gamma}{prime} phase was measured with atom-probe field-ion microscopy. Marked differences in partitioning characteristics in two welds were observed and are related to differences in cooling rates. In this paper, the modeling tools available to describe the above are reviewed.

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30 p.

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OSTI as DE98001066

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  • 1997 conference on numerical analysis of weldability, Graz (Austria), 29 Sep - 1 Oct 1997

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  • Other: DE98001066
  • Report No.: ORNL/CP--94929
  • Report No.: CONF-9709120--
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 554146
  • Archival Resource Key: ark:/67531/metadc691836

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Office of Scientific & Technical Information Technical Reports

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  • November 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Jan. 21, 2016, 1:47 p.m.

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David, S.A.; Babu, S.S. & Vitek, J.M. Weldability and microstructure development in nickel-base superalloys, article, November 1, 1997; Tennessee. (digital.library.unt.edu/ark:/67531/metadc691836/: accessed April 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.