Selective laser melted Al-7Si-0.6Mg alloy with in-situ precipitation via platform heating for residual strain removal

Research output: Contribution to journalArticleResearchpeer-review

Abstract

A series of complex post-build heat treatment procedures are usually inevitable for selective laser melted (SLMed) Al-Si-Mg alloys, aiming to remove significant process-induced residual strains. In this work, we propose a new method to avoid the post-build heat treatment without compromising the mechanical properties in SLMed Al alloy A357. By heating up the build platform (up to 90 °C) during SLM fabrication or applying post heat treatment after SLM, the evolution of microstructure and mechanical properties for Al-7Si-0.6Mg alloy are compared at different conditions. Characterisations using scanning electron microscopy (SEM), X-ray Diffraction (XRD), transmission electron microscopy (TEM), and hardness tests suggest heating up the build platform is more effective in alleviating residual strain and resulting in uniform precipitates in the Al matrix. Tensile properties imply that SLMed A357 fabricated with a heated substrate possesses improved mechanical properties compared to SLMed A357 build on room temperature platforms and even with post-build heat treatment.

Original languageEnglish
Article number108005
Number of pages11
JournalMaterials and Design
Volume182
DOIs
Publication statusPublished - 15 Nov 2019

Keywords

  • Al-Si-Mg alloys
  • Heat treatment
  • Mechanical properties
  • Residual strains
  • Selective laser melting

Cite this

@article{509c942bbf484fde95e5ff6392a52137,
title = "Selective laser melted Al-7Si-0.6Mg alloy with in-situ precipitation via platform heating for residual strain removal",
abstract = "A series of complex post-build heat treatment procedures are usually inevitable for selective laser melted (SLMed) Al-Si-Mg alloys, aiming to remove significant process-induced residual strains. In this work, we propose a new method to avoid the post-build heat treatment without compromising the mechanical properties in SLMed Al alloy A357. By heating up the build platform (up to 90 °C) during SLM fabrication or applying post heat treatment after SLM, the evolution of microstructure and mechanical properties for Al-7Si-0.6Mg alloy are compared at different conditions. Characterisations using scanning electron microscopy (SEM), X-ray Diffraction (XRD), transmission electron microscopy (TEM), and hardness tests suggest heating up the build platform is more effective in alleviating residual strain and resulting in uniform precipitates in the Al matrix. Tensile properties imply that SLMed A357 fabricated with a heated substrate possesses improved mechanical properties compared to SLMed A357 build on room temperature platforms and even with post-build heat treatment.",
keywords = "Al-Si-Mg alloys, Heat treatment, Mechanical properties, Residual strains, Selective laser melting",
author = "Rao, {Jeremy H.} and Yong Zhang and Kai Zhang and Xinhua Wu and Aijun Huang",
year = "2019",
month = "11",
day = "15",
doi = "10.1016/j.matdes.2019.108005",
language = "English",
volume = "182",
journal = "Materials & Design",
issn = "0264-1275",
publisher = "Elsevier",

}

Selective laser melted Al-7Si-0.6Mg alloy with in-situ precipitation via platform heating for residual strain removal. / Rao, Jeremy H.; Zhang, Yong; Zhang, Kai; Wu, Xinhua; Huang, Aijun.

In: Materials and Design, Vol. 182, 108005, 15.11.2019.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Selective laser melted Al-7Si-0.6Mg alloy with in-situ precipitation via platform heating for residual strain removal

AU - Rao, Jeremy H.

AU - Zhang, Yong

AU - Zhang, Kai

AU - Wu, Xinhua

AU - Huang, Aijun

PY - 2019/11/15

Y1 - 2019/11/15

N2 - A series of complex post-build heat treatment procedures are usually inevitable for selective laser melted (SLMed) Al-Si-Mg alloys, aiming to remove significant process-induced residual strains. In this work, we propose a new method to avoid the post-build heat treatment without compromising the mechanical properties in SLMed Al alloy A357. By heating up the build platform (up to 90 °C) during SLM fabrication or applying post heat treatment after SLM, the evolution of microstructure and mechanical properties for Al-7Si-0.6Mg alloy are compared at different conditions. Characterisations using scanning electron microscopy (SEM), X-ray Diffraction (XRD), transmission electron microscopy (TEM), and hardness tests suggest heating up the build platform is more effective in alleviating residual strain and resulting in uniform precipitates in the Al matrix. Tensile properties imply that SLMed A357 fabricated with a heated substrate possesses improved mechanical properties compared to SLMed A357 build on room temperature platforms and even with post-build heat treatment.

AB - A series of complex post-build heat treatment procedures are usually inevitable for selective laser melted (SLMed) Al-Si-Mg alloys, aiming to remove significant process-induced residual strains. In this work, we propose a new method to avoid the post-build heat treatment without compromising the mechanical properties in SLMed Al alloy A357. By heating up the build platform (up to 90 °C) during SLM fabrication or applying post heat treatment after SLM, the evolution of microstructure and mechanical properties for Al-7Si-0.6Mg alloy are compared at different conditions. Characterisations using scanning electron microscopy (SEM), X-ray Diffraction (XRD), transmission electron microscopy (TEM), and hardness tests suggest heating up the build platform is more effective in alleviating residual strain and resulting in uniform precipitates in the Al matrix. Tensile properties imply that SLMed A357 fabricated with a heated substrate possesses improved mechanical properties compared to SLMed A357 build on room temperature platforms and even with post-build heat treatment.

KW - Al-Si-Mg alloys

KW - Heat treatment

KW - Mechanical properties

KW - Residual strains

KW - Selective laser melting

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