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Heat treatment influences densification and porosity of AlSi10Mg alloy thin-walled parts manufactured by selective laser melting technique

  • Arfan MajeedEmail author
  • Muhammad Muzamil
  • Jingxiang Lv
  • Bufan Liu
  • Fiaz Ahmad
Technical Paper
  • 76 Downloads

Abstract

The fully dense thin-walled structures are very important for manufacturers and customers. Selective laser melting (SLM) is mainly employed for the fabrication of thin-walled and lightweight structures of aluminum alloys, titanium alloys, etc. The goal of the paper is to study the effect of heat treatments, i.e., solution heat treatment (SHT) and artificial aging (AA) on the densification and porosity of the thin-walled specimens. Thin-walled specimens with various wall thicknesses (i.e., from 0.50 to 5.0 mm) were fabricated using AlSi10Mg alloy powder with optimal process parameters on the SLM system. The relative densities of the heat-treated specimens were compared with the as-built test specimens. The porosity development during the process and their relationship with the relative density are also studied critically by applying Archimedes’ method and optical microscopic analysis. Results showed that the densification and porosity distribution behavior is changing with the variations in the wall thickness of specimens. The lowest relative density of 93.42% was obtained for 1.50-mm-wall-thickness specimen in SHT condition. The maximum relative density of 98.61% was achieved for 5.0-mm-wall-thickness specimen in the AA condition. Finally, it is concluded that the AA has a significant influence on the low-wall-thickness (i.e., from 0.50 to 2.0 mm) specimens, and the densification is improved, and porosities are reduced due to fine grain structure and strong bonding between particles.

Keywords

Thin-walled specimens Heat treatment Relative density Porosity AlSi10Mg Selective laser melting Wall thickness 

Notes

Acknowledgements

This research is supported by the National Natural Science Foundation of China (Nos. 51505423, 51705428) and the International Clean Energy Talent Program (ICET) of China Scholarship Council (Liujinfa [2017] 5047 and Liujinfa [2018] 5023). The author would like to thank Miss Song Le and Mr. Fahad Zafar for helping in performing heat treatment of specimens.

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Copyright information

© The Brazilian Society of Mechanical Sciences and Engineering 2019

Authors and Affiliations

  1. 1.Key Laboratory of Contemporary Design and Integrated Manufacturing Technology, School of Mechanical EngineeringNorthwestern Polytechnical UniversityXi’anChina
  2. 2.Mechanical Engineering DepartmentNED University of Engineering and TechnologyKarachiPakistan
  3. 3.School of Life SciencesNorthwestern Polytechnical UniversityXi’anChina

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