Effect of build orientation on fracture and tensile behavior of A357 Al alloy processed by Selective Laser Melting

Menezes, João Teixeira Oliveira de; Castrodeza, Enrique Mariano; Casati, Riccardo

doi:10.1016/j.msea.2019.138392

Cited by 47 publications

(10 citation statements)

References 12 publications

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“…Based on the above, studies aimed at optimizing the heat treatment of AlSi7Mg samples produced by LPBF are needed. Several scientific papers, in fact, were recently focused on heat treatments of LPBF AlSi7Mg0.6, and the current state of the art on this topic can be summarized as follows: (1) conventional T6 treatment, [13,14] (2) T6 treatment with a shortened solution treatment (0.25, 1, 2 hours), [14][15][16] (3) direct aging from the as-built condition at the conventional aging temperature of 160 to 165°C, [14,15,17] and (4) stress-relieving treatment performed at 300°C 9 2 to 3 hours. [13,16,18,19] The scope of direct aging and T6 treatment is to induce alloy strengthening.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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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“…Casati et al [48] and Yang et al [49] investigated the A357 alloy produced by LPBF to evaluate its response to thermal ageing. Oliveira de Menezes et al [50] studied the effect of build orientation on tensile behavior of A357 Al alloy produced by LPBF.…”

Section: Introductionmentioning

confidence: 99%

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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“…The results showed that high silicon content results in higher low-melting phases and refined grains, which reduce the crack occurrence. The tensile properties and fracture toughness of the A357 aluminum alloy were investigated by Oliveira de Menezes et al (2019). Moreover, the crack propagation and fracture (2018) examined the fatigue performance in AlSi10Mg, finding a correlation between crack-initiating pores on the fracture surface and fatigue life.…”

Section: Aluminum-based Alloysmentioning

confidence: 99%

Selective laser melting: lessons from medical devices industry and other applications

Fé-Perdomo

Ramos‐Grez

Beruvides³

et al. 2021

RPJ

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Purpose The purpose of this paper is to outline some key aspects such as material systems used, phenomenological and statistical process modeling, techniques applied to monitor the process and optimization approaches reported. All these need to be taken into account for the ongoing development of the SLM technique, particularly in health care applications. The outcomes from this review allow not only to summarize the main features of the process but also to collect a considerable amount of investigation effort so far achieved by the researcher community. Design/methodology/approach This paper reviews four significant areas of the selective laser melting (SLM) process of metallic systems within the scope of medical devices as follows: established and novel materials used, process modeling, process tracking and quality evaluation, and finally, the attempts for optimizing some process features such as surface roughness, porosity and mechanical properties. All the consulted literature has been highly detailed and discussed to understand the current and existing research gaps. Findings With this review, there is a prevailing need for further investigation on copper alloys, particularly when conformal cooling, antibacterial and antiviral properties are sought after. Moreover, artificial intelligence techniques for modeling and optimizing the SLM process parameters are still at a poor application level in this field. Furthermore, plenty of research work needs to be done to improve the existent online monitoring techniques. Research limitations/implications This review is limited only to the materials, models, monitoring methods, and optimization approaches reported on the SLM process for metallic systems, particularly those found in the health care arena. Practical implications SLM is a widely used metal additive manufacturing process due to the possibility of elaborating complex and customized tridimensional parts or components. It is corroborated that SLM produces minimal amounts of waste and enables optimal designs that allow considerable environmental advantages and promotes sustainability. Social implications The key perspectives about the applications of novel materials in the field of medicine are proposed. Originality/value The investigations about SLM contain an increasing amount of knowledge, motivated by the growing interest of the scientific community in this relatively young manufacturing process. This study can be seen as a compilation of relevant researches and findings in the field of the metal printing process.

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Effect of build orientation on fracture and tensile behavior of A357 Al alloy processed by Selective Laser Melting

Cited by 47 publications

References 12 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

A357 Alloy by LPBF for Industry Applications

Selective laser melting: lessons from medical devices industry and other applications

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