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  4. Comprehensive study on the formation of grain boundary serrations in additively manufactured Haynes 230 alloy
 
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2020
Journal Article
Title

Comprehensive study on the formation of grain boundary serrations in additively manufactured Haynes 230 alloy

Abstract
Recently, grain boundary serrations have been introduced in conventionally processed Haynes 230 through a slow-cooling heat treatment. The aim of this work was to utilize these heat treatments to introduce serrations in additively manufactured (Laser Metal Deposition) Haynes 230. Contrary to expectations, serrations already formed during the fast-cooling of the Laser Metal Deposition process. Electron Backscatter Diffraction was used to elucidate the underlying phenomenon for the emergence of serrations during fast-cooling. As a result, a hypothesis regarding a new mechanism responsible for the formation of grain boundary serrations was formulated. Additionally, specific characteristics of the Laser Metal Deposition process have been identified. This includes a columnar-to-equiaxed transition (CET) for slower feed rates, leading to smaller grains despite lower cooling rates; the observation of an abrupt increase in grain growth for a raised solution annealing temperature; the fact that serrations hinder uncontrolled grain growth and finally that the LMD-process leads to a finer carbide morphology compared to conventional manufacturing methods, potentially leading to an increased precipitation strengthening effect.
Author(s)
Haack, Maximilian
Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS  
Kuczyk, Martin  
Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS  
Seidel, André  
Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS  
Lopez, Elena  
Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS  
Brückner, Frank  
Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS  
Leyens, Christoph  orcid-logo
Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS  
Journal
Materials characterization  
DOI
10.1016/j.matchar.2019.110092
Language
English
Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS  
Keyword(s)
  • additive manufacturing

  • EBSD

  • Haynes 230

  • superalloy

  • grain boundary serration

  • laser metal deposition

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