Effect of Process and Post-Process Conditions on the Mechanical Properties of an A357 Alloy Produced via Laser Powder Bed Fusion

Aversa, Alberta; Lorusso, Massimo; Trevisan, F.; Ambrosio, Elisa Paola; Calignano, Flaviana; Manfredi, Diego; Biamino, Sara; Fino, Paolo; Lombardi, Mariangela; Pavese, Matteo

doi:10.3390/met7020068

Cited by 75 publications

(45 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[91] In terms of sophisticated designs, which utilize the peculiarities for their benefit, the precise description of the material behavior is required. [91,95,130] Moreover, this inhomogeneity was superimposed with tensile properties which showed a highly dependency to the load versus layer orientation, with maxima of strength and ductility in, or close to, a parallel layer to loading case. Commonly, this is undertaken based on the component's alignment and positioning during manufacture (see Figure 6).…”

Section: Mechanical Propertiesmentioning

confidence: 98%

“…However, it was revealed that AM microstructures react differently to HTs. [130,145,150] A subsequent aging was found to homogenize the microstructure by assimilating the various precipitation [95] Al-3.5Cu-1.5Mg-1Si 223 366 5.3 Φ ¼ 90 [154] AlMgScMnZr 68.0-73.6 >277 >400 Φ ¼ 0 , 90 [116] A t and A g are for most cases in very close proximity, since these Al alloys do not show necking before fracture. [115,216] Thus, representing a local weak spot for the occurrence of brittle fractures along the Si-rich areas, namely the scan track overlaps and the wetting areas between layers (Figure 2b).…”

Section: Tensile Strengthmentioning

confidence: 99%

See 1 more Smart Citation

A Review of Metal Fabricated with Laser‐ and Powder‐Bed Based Additive Manufacturing Techniques: Process, Nomenclature, Materials, Achievable Properties, and its Utilization in the Medical Sector

et al. 2018

View full text Add to dashboard Cite

Additive manufacturing has multiple advantages over conventional fabrication techniques, such as the geometrical freedom and, to a great extent, the omission of tooling equipment. Hence, futuristic designs and non-standard topology-optimized structures can be fabricated without causing noteworthy extra cost, since the geometrical complexity is, exaggeratedly spoken, for free. The manufacturing time and the amount of required raw material are the key criteria, which determine the expenses. What at first glance appears as an engineer's dream, introduces its complexity in the description of the material's characteristics and their volatility to the manufacturing conditions. Within this study, the main properties (i.e., surface hardness, tensile, and compression strength, as well as fracture toughness) and their anisotropic and inhomogeneous nature are addressed. Detailed overviews of the progress to date for aluminum, iron, titanium, cobalt, and nickel based raw materials are provided. Furthermore, an overview about the state-of-the-art in the medical sector is included, comprising the areas of utilization and several trail studies.

show abstract

Section: Mechanical Propertiesmentioning

confidence: 98%

Section: Tensile Strengthmentioning

confidence: 99%

A Review of Metal Fabricated with Laser‐ and Powder‐Bed Based Additive Manufacturing Techniques: Process, Nomenclature, Materials, Achievable Properties, and its Utilization in the Medical Sector

et al. 2018

View full text Add to dashboard Cite

show abstract

“…The build platform was pre-heated in order to obtain an in situ aging effect, which made it possible to minimize the anisotropy of the finished part [15] and slow the cooling rate, thus reducing the residual stress state as compared to unheated parts [32]. For this reason, no stress-relieving treatment was performed on the built parts.…”

Section: Am Conditionsmentioning

confidence: 99%

“…A357.0 is a new entry on the market of commercial feedstocks for AM and hence very little is known so far about its properties. In fact, very few papers have been published to date on the production, microstructure, and mechanical properties of A357.0 parts manufactured by L-PBF [32][33][34][35][36]. It is worth noting that such articles are all very recent, since they have been published after 2016, which confirms the growing interest in this new aluminum alloy for L-PBF.…”

mentioning

confidence: 96%

Fatigue Behavior of As-Built L-PBF A357.0 Parts

Bassoli

Denti

Comin

et al. 2018

Metals

View full text Add to dashboard Cite

Laser-based powder bed fusion (L-PBF) is nowadays the preeminent additive manufacturing (AM) technique to produce metal parts. Nonetheless, relatively few metal powders are currently available for industrial L-PBF, especially if aluminum-based feedstocks are involved. In order to fill the existing gap, A357.0 (also known as A357 or A13570) powders are here processed by L-PBF and, for the first time, the fatigue behavior is investigated in the as-built state to verify the net-shaping potentiality of AM. Both the low-cycle and high-cycle fatigue areas are analyzed to draw the complete Wohler diagram. The infinite lifetime limit is set to 2 × 10 6 stress cycles and the staircase method is applied to calculate a mean fatigue strength of 60 MPa. This value is slightly lower but still comparable to the published data for AlSi10Mg parts manufactured by L-PBF, even if the A357.0 samples considered here have not received any post-processing treatment.Keywords: additive manufacturing; laser-based powder bed fusion; aluminum; fatigue strength present in AM parts, which may impact the mechanical behavior of finished constructs [3].Originally developed for rapid prototyping, AM is now growing very rapidly in terms of production numbers and economic importance. According to recent estimations, the sale of AM products and services is expected to grow from US $5.2 billion in 2015 to over US $26.5 billion by 2021. If metal AM is considered, according to statistics, 1768 AM systems were sold in 2017, compared to 983 systems in 2016, thus scoring an impressive increase of nearly 80% [4].Standard ISO/ASTM 52900-15 [5], which defines general principles and terminology for AM, groups AM techniques into seven categories, all of which are compatible with polymer feedstocks. However, only three of these processes, including powder bed fusion, direct energy deposition, and sheet lamination, also apply to metals. Among them, powder bed fusion (PBF) is emerging as the most promising one, on account of its flexibility in terms of part design and feedstock availability.In PBF, thermal energy is used to selectively consolidate specific areas of the powder bed, which is a relatively thin layer of fresh powder (typically below 100 µm) evenly distributed on top of the previously consolidated powder layers. The heat input may be supplied by an electron beam, in electron beam melting (EBM), or by a laser beam, in laser-based powder bed fusion (L-PBF). In the latter case, consolidation may rely upon sintering (direct laser sintering, DLS, also known as selective laser sintering, SLS) or complete melting-solidification mechanisms (selective laser melting, SLM) [6]. As a rule, the energy conveyed to the powder bed is enough to affect not only the new powder layer, but also the material underneath, so as to provide interlayer bonding [7].At present, in spite of the increasingly widespread diffusion of AM in the industry, there is still a lack of understanding of the mechanical behavior of materials processed by L-PBF, especially aluminum and its alloys...

show abstract

“…The most popular Al-Si alloy processed by LPBF is AlSi 10 Mg alloy (similar to A360). Other Al-Si alloys by LPBF are AlSi 7 Mg (called also A357) [10][11] and AlSi 12 Mg [12].…”

Section: Aluminum Alloys 31 Introductionmentioning

confidence: 99%

Tribological and Wear Behavior of Metal Alloys Produced by Laser Powder Bed Fusion (LPBF)

Lorusso¹

2019

Friction, Lubrication and Wear

Self Cite

View full text Add to dashboard Cite

Laser powder bed fusion (LPBF) is an additive manufacturing technique for the production of parts with complex geometry, and it is especially appropriate for structural applications in aircraft and automotive industries. Wear is the most important cause of malfunction of mechanical systems. Abrasive wear accounts for 50% of wear in industrial situations, and it is most common in components of machines. LPBF is very attractive due to its extremely high melting and solidification rates that make possible to obtain materials with particular tribological and wear behavior than those by traditional manufacturing routes. The aim of this chapter is to investigate the different behaviors of principal metallic alloys by LPBF.

show abstract

Effect of Process and Post-Process Conditions on the Mechanical Properties of an A357 Alloy Produced via Laser Powder Bed Fusion

Cited by 75 publications

References 29 publications

A Review of Metal Fabricated with Laser‐ and Powder‐Bed Based Additive Manufacturing Techniques: Process, Nomenclature, Materials, Achievable Properties, and its Utilization in the Medical Sector

A Review of Metal Fabricated with Laser‐ and Powder‐Bed Based Additive Manufacturing Techniques: Process, Nomenclature, Materials, Achievable Properties, and its Utilization in the Medical Sector

Fatigue Behavior of As-Built L-PBF A357.0 Parts

Tribological and Wear Behavior of Metal Alloys Produced by Laser Powder Bed Fusion (LPBF)

Contact Info

Product

Resources

About