Simulation of weld solidifiation cracking in varestraint tests of alloy 718
Selected peer reviewed papers from the 12th International Seminar Numerical Analysis of Weldability
Document identifier: oai:DiVA.org:ltu-75740
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10.3217/978-3-85125-615-4-26Keyword: Engineering and Technology,
Materials Engineering,
Other Materials Engineering,
Teknik och teknologier,
Materialteknik,
Annan materialteknik,
Solidification cracking,
Hot cracking,
Varestraint testing,
Computational Welding Mechanics,
Alloy 718,
Material Mechanics,
MaterialmekanikPublication year: 2019Relevant Sustainable Development Goals (SDGs):
The SDG label(s) above have been assigned by OSDG.aiAbstract: Several nickel-based superalloys are susceptible to weld solidification cracking. Numerical simulation can be a powerful tool for optimizing the welding process such that solidification cracking can be avoided. In order to simulate the cracking, a crack model inspired by the RDG model is proposed. The model is based on a crack criterion that estimates the likelihood for a preexisting pore in a grain boundary liquid film to form a crack. The criterion depends on the thickness and the liquid pressure in the grain boundary liquid film, as well as the surface tension of the pore. The thickness of the liquid film is computed from the macroscopic mechanical strain field of an FE model with a double ellipsoidal heat source. A temperature-dependent length scale is used to partition the macroscopic strain to the liquid film. The liquid pressure in the film is evaluated using a combination of Poiseuille parallel plate flow and Darcy’s law for porous flows. The Poiseuille flow is used for the part of the grain boundary liquid film that extends into the region with liquid fraction less than 0.1, while Darcy’s law is used for the rest of the liquid film that extends into the regions with liquid fraction greater than 0.1. The proposed model was calibrated and evaluated in Varestraint tests of Alloy 718. Crack location, width, and orientation were all accurately predicted by the model.
Authors
J. Draxler
Luleå tekniska universitet; Material- och solidmekanik
Other publications
>>
J. Edberg
Luleå tekniska universitet; Material- och solidmekanik
Other publications
>>
J. Andersson
University West, 46132 Trollhättan, Sweden
Other publications
>>
L-E. Lindgren
Luleå tekniska universitet; Material- och solidmekanik
Other publications
>>
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identifier: oai:DiVA.org:ltu-75740
datestamp: 2021-04-19T12:54:09Z
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recordCreationDate: 2019-08-29
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10.3217/978-3-85125-615-4-26
titleInfo:
@attributes:
lang: eng
title: Simulation of weld solidifiation cracking in varestraint tests of alloy 718
abstract: Several nickel-based superalloys are susceptible to weld solidification cracking. Numerical simulation can be a powerful tool for optimizing the welding process such that solidification cracking can be avoided. In order to simulate the cracking a crack model inspired by the RDG model is proposed. The model is based on a crack criterion that estimates the likelihood for a preexisting pore in a grain boundary liquid film to form a crack. The criterion depends on the thickness and the liquid pressure in the grain boundary liquid film as well as the surface tension of the pore. The thickness of the liquid film is computed from the macroscopic mechanical strain field of an FE model with a double ellipsoidal heat source. A temperature-dependent length scale is used to partition the macroscopic strain to the liquid film. The liquid pressure in the film is evaluated using a combination of Poiseuille parallel plate flow and Darcy’s law for porous flows. The Poiseuille flow is used for the part of the grain boundary liquid film that extends into the region with liquid fraction less than 0.1 while Darcy’s law is used for the rest of the liquid film that extends into the regions with liquid fraction greater than 0.1. The proposed model was calibrated and evaluated in Varestraint tests of Alloy 718. Crack location width and orientation were all accurately predicted by the model.
subject:
@attributes:
lang: eng
authority: uka.se
topic:
Engineering and Technology
Materials Engineering
Other Materials Engineering
@attributes:
lang: swe
authority: uka.se
topic:
Teknik och teknologier
Materialteknik
Annan materialteknik
@attributes:
lang: eng
topic: Solidification cracking
@attributes:
lang: eng
topic: Hot cracking
@attributes:
lang: eng
topic: Varestraint testing
@attributes:
lang: eng
topic: Computational Welding Mechanics
@attributes:
lang: eng
topic: Alloy 718
@attributes:
lang: eng
authority: ltu
topic: Material Mechanics
genre: Research subject
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lang: swe
authority: ltu
topic: Materialmekanik
genre: Research subject
language:
languageTerm: eng
genre:
conference/other
ref
note:
Published
4
ISBN för värdpublikation: 978-3-85125-615-4 978-3-85125-616-1
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Draxler
J.
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affiliation:
Luleå tekniska universitet
Material- och solidmekanik
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0000-0002-2197-6243
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Edberg
J.
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Luleå tekniska universitet
Material- och solidmekanik
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0000-0002-7298-020x
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Andersson
J.
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affiliation: University West 46132 Trollhättan Sweden
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authority: ltu
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Lindgren
L-E.
role:
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affiliation:
Luleå tekniska universitet
Material- och solidmekanik
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lel
0000-0002-2544-9168
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dateIssued: 2019
place:
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titleInfo:
title: Mathematical Modelling of Weld Phenomena 12
subTitle: Selected peer reviewed papers from the 12th International Seminar Numerical Analysis of Weldability
part:
extent:
start: 485
end: 504
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type: series
titleInfo:
title: Mathematical Modelling of Weld Phenomena
partNumber: 12
identifier: 2410-0544
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