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High and very high cycle fatigue failure mechanisms in selective laser melted aluminum alloys

Published online by Cambridge University Press:  22 August 2017

Shafaqat Siddique Open the ORCID record for Shafaqat Siddique [Opens in a new window] ,
Mustafa Awd ,
Jochen Tenkamp  and
Frank Walther
Shafaqat Siddique
Affiliation:
Department of Materials Test Engineering (WPT), TU Dortmund University, Dortmund 44227, Germany
Mustafa Awd*
Affiliation:
Department of Materials Test Engineering (WPT), TU Dortmund University, Dortmund 44227, Germany
Jochen Tenkamp
Affiliation:
Department of Materials Test Engineering (WPT), TU Dortmund University, Dortmund 44227, Germany
Frank Walther
Affiliation:
Department of Materials Test Engineering (WPT), TU Dortmund University, Dortmund 44227, Germany
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Selective laser melting, a laser-based additive manufacturing process, can manufacture components with good geometrical integrity. Application of the selective laser melting process for serial production is subject to its reliability on mechanical properties, especially on fatigue behavior, when it is required to be applied for dynamic applications. This study focuses on microstructural, quasistatic, high cycle fatigue (HCF), and very high cycle fatigue (VHCF) mechanisms of aluminum alloys manufactured by selective laser melting. Manufacturing of hybrid structures by selective laser melting process is also investigated. Microstructural features were investigated for process-induced effects and the corresponding influence on quasistatic and fatigue properties. The microstructural features can be controlled in the selective laser melting process for required properties. Joining strengths in hybrid structures can be improved by post process heat-treatments. Material constants in different fatigue regions were determined, and higher fatigue strength of hybrid alloys was achieved in HCF as well as VHCF regimes.

Keywords

Alfatiguemicrostructure
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 23: Focus Issue: Mechanical Properties and Microstructure of Advanced Metallic Alloys—in Honor of Prof. Haël Mughrabi PART A , 14 December 2017 , pp. 4296 - 4304
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Mathias Göken

References

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