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Stress Corrosion Cracking Behavior of LPBF AlSi10MG

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Over the last few decades, the aerospace industry has been demanding lighter components with improved mechanical performance for next-generation platforms. Additive manufacturing via laser powdered bed fusion (LPBF) has the unique capability of producing such parts, with AlSi10Mg becoming a primary material candidate for various aluminum components in these situations. However, LPBF AlSi10Mg has been known to show differences in corrosion resistance from its cast counterparts that must be examined more thoroughly. This study presents stress corrosion cracking (SCC) evaluation in an alternate immersion bath and subsequent tensile testing of LPBF AlSi10Mg at three different heat treatments: HIP+T6, T6 Only, and Stress Relief Only (SR1). Tensile results paired with fractography and metallography results indicated no presence of SCC in the AlSi10Mg samples. However, a vast discrepancy was observed in the final breaking strain between samples tested in air and samples put through the alternate immersion bath, which is certainly a corrosion effect. Understanding of this phenomenon will be vital to the design of aerospace components using LBPF AlSi10Mg. 

Learning Objectives:

  • Understand the stress corrosion cracking behavior of AlSi10Mg and be able to leverage this data into qualification and use of such parts.
  • Proceed with future efforts which build upon this work to further the understanding of LPBF AlSi10Mg corrosion behavior.
  • Gain access to our paper which provides more detail to the body of work we are presenting.
  • Michael A. Pratt
    Additive Manufacturing Research Engineer
    University of Dayton Research Institute