Evolution of interphase stress over a crack propagation plane as a function of stress relief heat treatments in a PBF‐LB/M AlSi10Mg alloy

Strain, vol. 60

Abstract

Abstract In this study, we compare the residual stress state in a laser powder bed fusion (PBF‐LB/M) AlSi10Mg alloy in the as‐built (AB) condition with that after two different heat treatments (265 °C for 1 h, HT1; and 300 °C for 2 h, HT2). The bulk residual stress (RS) is determined using synchrotron X‐ray diffraction (SXRD), and near‐surface profiles are determined using laboratory energy‐dispersive X‐ray diffraction (EDXRD). The EDXRD results do not reveal any notable difference between the conditions at a depth of 350 μm, suggesting that the machining process yields a comparable residual stress state in the near‐surface regions. On the other hand, the SXRD results show that HT1 is more effective in relieving the bulk RS. It is observed that HT1 reduces the RS state in both the aluminium matrix and the silicon network. In addtion, HT2 does not have a significant impact on relaxing the RS as‐built state of the matrix, although it does induce a reduction in the RS magnitudes of the Si phase. It is concluded that the heat treatment stress relieving is effective as long as the Si‐network is not disaggregated.

Authors 8

1. Ilaria Roveda

   Federal Institute For Materials Research and Testing

   Affiliation as printed

   Bundesanstalt für Materialforschung und –prüfung (BAM) Berlin Germany

2. Tatiana Mishurova

   Federal Institute For Materials Research and Testing

   Affiliation as printed

   Bundesanstalt für Materialforschung und –prüfung (BAM) Berlin Germany

3. Alexander Dominic Evans

   Federal Institute For Materials Research and Testing

   Affiliation as printed

   Bundesanstalt für Materialforschung und –prüfung (BAM) Berlin Germany

4. Andrew Nicholas Fitch

   European Synchrotron Radiation Facility

   Affiliation as printed

   European Synchrotron Radiation Facility Grenoble Cedex 9 France

   European Synchrotron Radiation Facility, Grenoble Cedex 9, France

5. Jan Haubrich

   Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)

   Affiliation as printed

   Institute of Materials Research German Aerospace Center (DLR) Cologne Germany

   Institute of Materials Research, German Aerospace Center (DLR), Cologne, Germany

6. Guillermo Carlos Requena Aachen

   Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR) · RWTH Aachen University

   Affiliation as printed

   Institute of Materials Research German Aerospace Center (DLR) Cologne Germany

   Metallic Structures and Materials Systems for Aerospace Engineering RWTH Aachen University Aachen Germany

   Institute of Materials Research, German Aerospace Center (DLR), Cologne, Germany

   Metallic Structures and Materials Systems for Aerospace Engineering, RWTH Aachen University, Aachen, Germany

7. Giovanni Bruno

   Federal Institute For Materials Research and Testing · University of Potsdam

   Affiliation as printed

   Bundesanstalt für Materialforschung und –prüfung (BAM) Berlin Germany

   Institute of Physics and Astronomy University of Potsdam Potsdam Germany

8. Itziar Serrano‐Munoz corresponding

   Federal Institute For Materials Research and Testing

   Affiliation as printed

   Bundesanstalt für Materialforschung und –prüfung (BAM) Berlin Germany