A comparative study of the effects of thermal treatments on AlSi10Mg produced by laser powder bed fusion

Padovano, Elisa; Badini, Claudio Francesco; Pantarelli, Anna; Grassi, Flavia; D’Aiuto, Fabio

doi:10.1016/j.jallcom.2020.154822

Cited by 76 publications

(49 citation statements)

References 41 publications

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“…Other than observing the duration of treatment and temperature, the cooling must be slow and controlled [159], usually performed in the furnace itself with the cooling duration equivalent or longer than the heat treatment itself. Many studies have been done on this heat treatment methodology [158,160,161].…”

Section: Annealing With Furnace Controlled Coolingmentioning

confidence: 99%

“…T6 heat treatment is a conventional heat treatment used for casted AlSi10Mg, to improve its mechanical strength. It involves treatment at approximately 520°C to 550°C for 2 hours, water quenching, and artificial aging between 160°C to 180°C for a range of 30 minutes to 18 hours [161]. Many modified versions of such treatment have been studied with varying solution treatment temperature and duration, quenching medium, aging temperature, and duration.…”

Section: Solution Heat Treatment With Quenching and Artificial Agingmentioning

confidence: 99%

“…The residual stress distribution obtained experimentally from Al-Cu alloy is shown in Figure 24 below, which is the same as that proposed in Figure 22. It has been established in many studies that the rapid cooling of the LBPB process results in the formation of Si in the form of a fibrous network structure in a-Al phase [161,166] as shown in Figure 26. Not just unique to the LBPB process, AlSi10Mg manufactured by direct metal laser sintering in which also involves rapid cooling also has the same microstructure [164,172].…”

Section: Heat Treatment With Quenching and Mechanism Of Residual Stress Inductionmentioning

confidence: 99%

“…The schematics of the silicon structure as illustrated in Figure 27. Padovano attributed the formation of this structure to the high cooling rate of approximately 10 6°C /s that results in Al-rich cells surrounded by Si-rich eutectic structures in the intercellular regions [161]. Table 5 below shows the comparison of the microstructure of LBPB manufactured AlSi10Mg specimens versus conventional cast material [174].…”

Section: Heat Treatment With Quenching and Mechanism Of Residual Stress Inductionmentioning

confidence: 99%

“…The existence of this unique fibrous network structure of Si in LBPB manufactured parts also contributed to its higher hardness as compared to that manufactured via the casting method [178]. Padovano [161] reviewed that the mismatch in the atomic size of Si (0.118 nm) and Al (0.143 nm) atoms results in lattice deformation that limits the movement of dislocations [180], thus contributes to the strengthening effect of AlSi10Mg in as-built condition from LBPB [174].…”

Section: Mechanical Properties and Anisotropy Of Alsi10mg Manufactured By Laser Beam Powder Bedmentioning

confidence: 99%

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Novel heat treatment methodology for residual stress relieve of AlSi10Mg without compromise of mechanical strength

Lim¹

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Section: Annealing With Furnace Controlled Coolingmentioning

confidence: 99%

Section: Solution Heat Treatment With Quenching and Artificial Agingmentioning

confidence: 99%

Section: Heat Treatment With Quenching and Mechanism Of Residual Stress Inductionmentioning

confidence: 99%

Section: Heat Treatment With Quenching and Mechanism Of Residual Stress Inductionmentioning

confidence: 99%

Section: Mechanical Properties and Anisotropy Of Alsi10mg Manufactured By Laser Beam Powder Bedmentioning

confidence: 99%

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Novel heat treatment methodology for residual stress relieve of AlSi10Mg without compromise of mechanical strength

Lim¹

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High‐Temperature Behavior of the Heat‐Treated and Overaged AlSi10Mg Alloy Produced by Laser‐Based Powder Bed Fusion and Comparison with Conventional Al–Si–Mg‐Casting Alloys

et al. 2023

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The continuous research of new technologies and materials to reduce the CO 2 footprint has led to a significant interest in additive manufacturing (AM). In particular, the laser-based powder bed fusion (L-PBF) process represents one of the most attractive technologies currently available for producing complex-shaped components characterized by light structures and high mechanical performance. [1,2] Transportation and energy are probably the main industrial sectors that can significantly benefit from reducing the mass and size of mechanical parts manufactured by the L-PBF process to reduce their environmental impact. [3,4] Fuel injectors, heat sinks, mixing and swirling burner tips, pistons, gas turbines, and aerodynamic parts are, in fact, a few examples of possible L-PBF-produced components. [5][6][7] However, thin-walled and lattice design solutions require the continuous development of new thermally stable materials capable of withstanding the thermomechanical stresses caused by the severe operating conditions (high temperatures and long service times) occurring in automotive, aeronautical, aerospace, and energy applications. [8][9][10] Among the metals used in the L-PBF process, the Al-Si-Mg alloys represent an up-and-coming solution for producing structural components. [11] They meet both mechanical (high strength-to-weight ratio) and production requirements (good fluidity and weldability) compared to other Al-casting alloys, such as the heat-resistant Al-Cu and Al-Zn alloys. [12][13][14][15] The Si content close to the eutectic point reduces the solidification range and increases the powder bed's laser absorption, thus improving the melt pool (MP) fluidity and simplifying the printing process. [16] In addition, the high Mg content enables precipitation of the Mg 2 Si precursor phases during the printing process, further strengthening the Al matrix. [17,18] The AlSi10Mg alloy is currently the most common Al-Si-Mg alloy used in the L-PBF process. The cellular structure of the as-built (AB) L-PBF AlSi10Mg alloy consists of sub-micrometric cells of supersatured α-Al phase surrounded by a eutectic-Si network, which gives high hardness and tensile strength values at the expense of ductility. [19][20][21] However, as widely described by the authors in previous work, [22] the thermally activated diffusion processes alter the metastable microstructure of the AB alloy, acting on the size and morphology of the dispersed (nano-sized Si precipitates and precursors of the Mg 2 Si equilibrium phase) and aggregated (eutectic-Si network) strengthening phases. Consequently, given the complexity of the topic, the literature in recent years has mainly focused on the effects of process parameters and heat treatments on the microstructure and the mechanical properties at room temperature (RT) of the L-PBF

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The Effect of the Iso‐Thermal Heat Treatment on the Microstructure and Properties of Powder Bed Fusion–Laser Beam AlSi10Mg Alloy

Katti,

Zhang,

Qiu

et al. 2024

Adv Eng Mater

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The effect of various iso‐thermal heat treatments on powder bed fusion‐laser beam (PBF‐LB) AlSi10Mg alloy has been widely studied; however, a process‐property relationship has not yet been established. In addition, the eutectic Al‐Si network breakdown and coarsening of eutectic Si from low‐to high (200oC–500oC) temperature heat treatment has not been investigated systematically. Therefore, the AlSi10Mg alloy is heat‐treated at 200oC, 300oC, 400oC, and 500oC for various holding times ranging from 0.5 to 32 hours. Uniaxial tensile and hardness tests are conducted, and the microstructure is characterised in detail. A unique approach is adopted for estimating Si solubility where 200oC heat‐treated microstructure data is used to estimate solute trapping due to the high cooling rate in the as‐fabricated state. Furthermore, it was observed that increasing the heat treatment temperature and time reduces the strength and strain hardening rate but increases the tensile elongation up to 400oC heat treatment. Above 500oC, the yield strength increases, and the elongation reduces compared with the 400oC heat treatment owing to the refined Fe containing dispersoid formation at 500oC. The important outcome of this study is heat treatment process‐property contour maps that are useful for fine‐tuning the mechanical properties of PBF‐LB AlSi10Mg alloy for industrial rapid prototyping application.This article is protected by copyright. All rights reserved.

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A comparative study of the effects of thermal treatments on AlSi10Mg produced by laser powder bed fusion

Cited by 76 publications

References 41 publications

Novel heat treatment methodology for residual stress relieve of AlSi10Mg without compromise of mechanical strength

Novel heat treatment methodology for residual stress relieve of AlSi10Mg without compromise of mechanical strength

High‐Temperature Behavior of the Heat‐Treated and Overaged AlSi10Mg Alloy Produced by Laser‐Based Powder Bed Fusion and Comparison with Conventional Al–Si–Mg‐Casting Alloys

The Effect of the Iso‐Thermal Heat Treatment on the Microstructure and Properties of Powder Bed Fusion–Laser Beam AlSi10Mg Alloy

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