Effect of heat treatment on the microstructure and anisotropy in mechanical properties of A357 alloy produced by selective laser melting

Yang, Kun; Rometsch, Paul; Davies, Chris; Huang, Aijun; Wu, Xinhua

doi:10.1016/j.matdes.2018.05.026

Cited by 167 publications

(79 citation statements)

References 53 publications

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“…The difference in the defect size range is reduced if the same types of defects are compared. If only pores are taken into account, the range found in the AB and in the HT‐320 is very close and the difference is reduced, in agreement with literature results showing that low temperature heat treatments do not alter the pore size …”

Section: Influence Of Defects and Of The Annealing Temperature: Discusupporting

confidence: 90%

“…It has been reported in literature that heat treatments generally do not affect the dimensions of pores and of incomplete fusion defects. Therefore, the evident variations among the populations of critical defects in specimens subjected to different heat treatments shall not be ascribed to a real change in number and type of defects present in the specimens but rather to a change in the conditions necessary for the critical propagation of a crack.…”

Section: Influence Of Defects and Of The Annealing Temperature: Discumentioning

confidence: 99%

“…Due to the small number of failure data, the LEVD of the defect size for each tested condition was not estimated. On the other hand, by considering that low temperature heat treatments do not alter the pore size, the LEVDs for all critical pores and incomplete fusion defects were estimated for comparison purposes. Figure shows the Gumbel plot of pores and incomplete fusion defects, together with the estimated LEVD distributions.…”

Section: Influence Of Defects and Of The Annealing Temperature: Discumentioning

confidence: 99%

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Influence of the annealing and defects on the VHCF behavior of an SLM AlSi10Mg alloy

Tridello

Fiocchi

Biffi

et al. 2019

Fatigue Fract Eng Mat Struct

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In the paper, the influence of the annealing temperature on the Very High Cycle Fatigue (VHCF) of AlSi10Mg specimens produced through selective laser melting (SLM) is experimentally assessed. VHCF tests at 20 kHz are carried out on Gaussian specimens subjected to a heat treatment suggested by the system supplier (heating for 2 hours to 320°C and air cooling) and to a heat treatment proposed by the authors (heating for 2 hours to 244°C and air cooling). The defects originating failure and the conditional P‐S‐N curves are compared. Experimental results show that an annealing temperature of 320 ° C induces the spheroidization of the Si network, which enhances the ductility but has a negative effect on the VHCF response. On the contrary, by reducing the heating temperature to 244 ° C, the original as‐built microstructure is not altered and the minimization of the residual stresses permits to enhance the VHCF response.

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Section: Influence Of Defects and Of The Annealing Temperature: Discusupporting

confidence: 90%

Section: Influence Of Defects and Of The Annealing Temperature: Discumentioning

confidence: 99%

Section: Influence Of Defects and Of The Annealing Temperature: Discumentioning

confidence: 99%

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Influence of the annealing and defects on the VHCF behavior of an SLM AlSi10Mg alloy

Tridello

Fiocchi

Biffi

et al. 2019

Fatigue Fract Eng Mat Struct

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“…[14] investigated the effects of laser parameters and building platform temperature on density and mechanical properties of LPBF A357 parts. 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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“…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.…”

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confidence: 97%

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

Bassoli

Denti

Comin

et al. 2018

Metals

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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...

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Effect of heat treatment on the microstructure and anisotropy in mechanical properties of A357 alloy produced by selective laser melting

Cited by 167 publications

References 53 publications

Influence of the annealing and defects on the VHCF behavior of an SLM AlSi10Mg alloy

Influence of the annealing and defects on the VHCF behavior of an SLM AlSi10Mg alloy

A357 Alloy by LPBF for Industry Applications

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

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