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

Rao, J. Babu; Zhang, Yong; Zhang, Kai; Wu, Xinhua; Huang, Aijun

doi:10.1016/j.matdes.2019.108005

Cited by 55 publications

(28 citation statements)

References 36 publications

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“…Unstressed Si [34][35][36] was much less prominent in the cast alloy, especially after T6 treatment. Literature results of the LPBF AlSi7Mg0.6 alloy subjected to short (1 to 2 hours) solution treatment showed, indeed, that coarsening of intermetallic particles might occur, which became visible as acicular particles at both optical and scanning electron analyses.…”

Section: Table V Average Raman Shift Of the Si Peak Measured For All Investigated Samples Compared With The Reference Value Formentioning

confidence: 94%

Role of Direct Aging and Solution Treatment on Hardness, Microstructure and Residual Stress of the A357 (AlSi7Mg0.6) Alloy Produced by Powder Bed Fusion

Tonelli

Liverani

Morri

et al. 2021

Metall Mater Trans B

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Applying additive manufacturing (AM) technologies to the fabrication of aluminum automotive components, with an optimized design, may result in improved vehicle light weighting. However, the post-process heat treatment of such alloys has to be customized for the particular AM microstructure. The present study is aimed at investigating the effect of different heat treatments on the microstructure, hardness and residual stress of the A357 (AlSi7Mg0.6) heat-treatable alloy produced by laser-based powder bed fusion (LPBF, also known as selective laser melting). There are two major issues to be addressed: (1) relieving the internal residual stress resulting from the process and (2) strengthening the alloy with a customized heat treatment. Therefore, stress-relief annealing treatment, direct aging of the as-built alloy and a redesigned T6 treatment (consisting of a shortened high-temperature solution treatment followed by artificial aging) were examined. Comparable hardness values were reached in the LPBF alloy with optimized direct aging and T6 treatments, but complete relief of the residual stress was obtained only with T6. Microstructural analyses also suggested that, because of the supersaturated solid solution, different phenomena were involved in direct aging and T6 treatment.

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Section: Table V Average Raman Shift Of the Si Peak Measured For All Investigated Samples Compared With The Reference Value Formentioning

confidence: 94%

Role of Direct Aging and Solution Treatment on Hardness, Microstructure and Residual Stress of the A357 (AlSi7Mg0.6) Alloy Produced by Powder Bed Fusion

Tonelli

Liverani

Morri

et al. 2021

Metall Mater Trans B

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“…The specific T levels used in this study were selected based on previous work, see supplementary Table S-II. 7,[12][13][14] Cracks and Distortions Assessment…”

Section: Powder and Lpbf Processmentioning

confidence: 99%

“…[6][7][8][9][10] Since these alloys can be agehardened, 11 the platform heating strategy can also induce the age-hardening effects to further improve the mechanical properties of the products, besides alleviating distortions and cracks. [12][13][14] Specifically, Aversa et al investigated the effect of various building platform temperatures on the strength and microstructure of an LPBF-produced A357 alloy. 12 Their results revealed the appearance of Mg 2 Si precipitates at different building platform temperatures due to the in situ aging induced by the heated platform during LPBF.…”

Section: Introductionmentioning

confidence: 99%

Production Strategy for Manufacturing Large-Scale AlSi10Mg Components by Laser Powder Bed Fusion

Bosio

Shen

Liu

et al. 2021

JOM

Self Cite

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The long production time required for large-scale parts fabricated by laser powder bed fusion (LPBF) tends to induce cracks, distortions, and overheating problems. In this work, to address these challenges, we explored and established a suitable strategy for producing large AlSi10Mg components. The platform temperatures to prevent cracks and distortions were firstly determined. Then, the in situ aging behavior was investigated for samples under various platform temperatures and holding times. Our results revealed that platform temperatures of 150°C and 200°C can effectively prevent cracks and minimize distortions. Besides, using 150°C, samples can reach peak hardness with a holding time less than 13 h. In comparison, those samples produced with a holding time longer than 13 h at 150°C and 200°C show obvious overaging responses and thus lower hardness. However, such a hardness impoverishment can be recovered by using a T6 post-process heat-treatment.

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“…Few studies have been addressed on the production and characterization of A357 parts made by LPBF. Rao et al [47] and Aversa et Al. [14] investigated the effects of laser parameters and building platform temperature on density and mechanical properties of LPBF A357 parts.…”

Section: Introductionmentioning

confidence: 95%

A357 Alloy by LPBF for Industry Applications

Lorusso

Trevisan²,

Calignano³

et al. 2020

Materials

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The aim of this study is to define the process parameters to build components for industrial applications in A357 alloy by Laser Powder Bed Fusion (LPBF) and to evaluate the effects of post-processing heat treatments on the microstructure and mechanical properties in order to obtain the highest hardness and strength. First, process parameters values were defined to obtain full dense components with highest productivity. Then samples were built for microstructural, hardness, and tensile strength investigation in different conditions: as-built, after a stress-relieving treatment, and after a T6 precipitation hardening treatment. For this latest treatment, different time and temperatures for solution and ageing were investigated to find the best in terms of final hardness achievable. It is demonstrated that samples in A357 alloy can be successfully fabricated by LPBF with a density of 99.9% and a mean hardness value achievable of 116 HV0.1, in as-built condition. However, for production purposes, it is fundamental to reduce the residual stresses typical of LPBF. It was shown that a similar hardness value could be obtained after a stress-relieving treatment followed by a proper T6 treatment, together with a coarser but more isotropic microstructure.

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

Cited by 55 publications

References 36 publications

Role of Direct Aging and Solution Treatment on Hardness, Microstructure and Residual Stress of the A357 (AlSi7Mg0.6) Alloy Produced by Powder Bed Fusion

Role of Direct Aging and Solution Treatment on Hardness, Microstructure and Residual Stress of the A357 (AlSi7Mg0.6) Alloy Produced by Powder Bed Fusion

Production Strategy for Manufacturing Large-Scale AlSi10Mg Components by Laser Powder Bed Fusion

A357 Alloy by LPBF for Industry Applications

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