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

Jeremy H. Rao; Yong Zhang; Kai Zhang; Xinhua Wu; Aijun Huang

doi:10.1016/j.matdes.2019.108005

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

Jeremy H. Rao, Yong Zhang, Kai Zhang, Xinhua Wu, Aijun Huang

Research output: Contribution to journal › Article › Research › peer-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 language	English
Article number	108005
Number of pages	11
Journal	Materials and Design
Volume	182
DOIs	https://doi.org/10.1016/j.matdes.2019.108005
Publication status	Published - 15 Nov 2019

Keywords

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

Cite this

Rao, J. H., Zhang, Y., Zhang, K., Wu, X., & Huang, A. (2019). Selective laser melted Al-7Si-0.6Mg alloy with in-situ precipitation via platform heating for residual strain removal. Materials and Design, 182, [108005]. https://doi.org/10.1016/j.matdes.2019.108005

Rao, Jeremy H. ; Zhang, Yong ; Zhang, Kai ; Wu, Xinhua ; Huang, Aijun. / Selective laser melted Al-7Si-0.6Mg alloy with in-situ precipitation via platform heating for residual strain removal. In: Materials and Design. 2019 ; Vol. 182.

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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",

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doi = "10.1016/j.matdes.2019.108005",

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Rao, JH , Zhang, Y, Zhang, K, Wu, X & Huang, A 2019, 'Selective laser melted Al-7Si-0.6Mg alloy with in-situ precipitation via platform heating for residual strain removal', Materials and Design, vol. 182, 108005. https://doi.org/10.1016/j.matdes.2019.108005

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 journal › Article › Research › peer-review

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AU - Rao, Jeremy H.

AU - Zhang, Yong

AU - Zhang, Kai

AU - Wu, Xinhua

AU - Huang, Aijun

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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.

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