Effect of scanning strategies on residual stress and mechanical properties of Selective Laser Melted Ti6Al4V

Ali, Haider; Ghadbeigi, Hassan; Mumtaz, Kamran

doi:10.1016/j.msea.2017.11.103

Cited by 427 publications

(160 citation statements)

References 26 publications

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“…This was attributed to the high process temperature of more than 600 ° C, which was due to the build platform and powder layer preheating used in E‐beam manufacturing method. In addition, it has been shown that the scanning strategy can have significant effects on residual stresses and, subsequently, on the mechanical properties of the fabricated parts …”

Section: Effect Of Residual Stressesmentioning

confidence: 99%

“…In addition, it has been shown that the scanning strategy can have significant effects on residual stresses and, subsequently, on the mechanical properties of the fabricated parts. 34,35 In a study by Ali et al, 36 a modified preheating platform was integrated into a L-PBF system to be able to increase the preheating temperature up to 800°C. They studied several temperatures ranging from 100°C to 770°C and were able to decrease the residual stress of Ti-6Al-4V specimens from 214 MPa at 100°C preheated chamber to less than 5 MPa at temperatures of 570°C and higher.…”

Section: Effect Of Residual Stressesmentioning

confidence: 99%

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Fatigue behaviour of additive manufactured materials: An overview of some recent experimental studies on Ti‐6Al‐4V considering various processing and loading direction effects

Fatemi

Molaei

Simsiriwong

et al. 2019

Fatigue Fract Eng Mat Struct

151

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Although additive manufacturing (AM) has gained significant attention due to the advantages it offers and is currently a focus of much research, design of critical load carrying components utilizing such processes is still at its infancy. This is due to the fact that most of the load carrying components made by AM processes are subjected to cyclic loads, and fatigue behaviour of AM metals is far less understood as compared with those made by conventional methods, such as wrought and cast metals. To better understand the fatigue behaviour of AM metals, a wide range of issues that affect the behaviour in a synergistic manner must be considered. These include the effects of defects, residual stresses, surface finish, geometry and size, layer orientation, and heat treatment. Additionally, due to the multiaxial nature of the loading and/or complex geometries typically manufactured by AM processes, the stress state is often multiaxial including both normal and shear stresses. In this paper, the aforementioned effects influencing the fatigue resistance of AM parts, including torsion and multiaxial fatigue behaviour, are briefly discussed using some recently generated experimental data on Ti‐6Al‐4V by the authors.

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Section: Effect Of Residual Stressesmentioning

confidence: 99%

Section: Effect Of Residual Stressesmentioning

confidence: 99%

Fatigue behaviour of additive manufactured materials: An overview of some recent experimental studies on Ti‐6Al‐4V considering various processing and loading direction effects

Fatemi

Molaei

Simsiriwong

et al. 2019

Fatigue Fract Eng Mat Struct

151

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show abstract

“…Ali et al [34,[39][40][41][42] measured residual stress with the strain gage hole-drilling method [34,[39][40][41][42][43][44][45] in SLM Ti6Al4V 30 × 30 × 10 mm blocks. Residual stress is inversely proportional to bed temperature and 570°C bed pre-heat temperature completely mitigated residual stress [42].…”

Section: Effect Of Geometrymentioning

confidence: 99%

“…Both SLM125 [42] and AM250 [39] have a maximum power of 200 W. Previous work from both systems for parameter optimisation trials showed that 200 W power and 100-μs exposure combination led to nearly fully dense (99.9%) parts for 100°C bed temperatures [39,42]. Therefore, the manufacturing of benchmark test specimens was carried out on a standard Renishaw AM250 machine using the process parameters presented in Table 2.…”

Section: Materials and Processing Parametersmentioning

confidence: 99%

Effect of pre-emptive in situ parameter modification on residual stress distributions within selective laser-melted Ti6Al4V components

Ali

Ghadbeigi

Hosseinzadeh

et al. 2019

Int J Adv Manuf Technol

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The effect of thermally induced residual stresses is not dynamically considered during a selective laser melting (SLM) build; instead, it processes using invariable parameters across the entire component's cross-section. This lack of pre-emptive in situ parameter adjustment to reduce residual stresses during processing is a lost opportunity for the process with the potential to improve component mechanical properties. This investigation studied the residual stresses introduced during manufacturing of SLM Ti6Al4V benchmark components and adapted process parameters within a build (layer-to-layer specific modifications) to manage and redistribute stresses within these components. It was found that temporarily switching to an increased layer thickness during the build, directly below highly stressed regions within the component, redistributed stresses and reduced the overall stresses within the structure by 8.5% (within the 80-320-MPa residual stress range) compared to standard invariable SLM processing parameters. This work demonstrates the need for current SLM systems to focus on developing a more intelligent processing architecture with parameters that adapt on the fly during a build, in order to manage residual stresses within the built structure.

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“…Additive Manufacturing (AM) techniques are used by most industries today to manufacture complete functional complex geometries from a digital model by joining material in a layer by layer mode [14][15][16]. Selective Laser Melting (SLM) which is a major technique in additive manufacturing generates high-density 3D parts by selectively melting and fusing metallic powder [17].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the effect of processing parameters on densification, microstructure and hardness of selective laser melted 7075 aluminium alloy

Mbakaan²,

Barki

2020

Mater. Res. Express

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The 7075 aluminum alloy of the 7xxx series largely used for structures in modern aircraft has been successfully fabricated using selective laser melting (SLM) technology. The morphology of the initial 7075 aluminum alloy powders was characterized by a Zeiss Evo 50 Scanning electron microscope (SEM). Energy Dispersive x-ray (EDX) spectrometer attached to SEM was used as a tool to obtain the chemical composition of the powders. Processing parameters including scan speed, hatch distance and constant laser power (100 and 150 W) effect on densification, microstructure and hardness were investigated. The initial powder particles were found to be elongated and non-spherical and composed of Al, Zn, Mg, Cu, and Ag without Si. The result of the influence of processing parameters on properties of the as-built samples by SLM technology indicates that higher densification of parts can be gained using higher laser power and lower laser scan speed and hatch distance due to significant reduction in the number of pores. Two major types of pores including metallurgical and keyhole pores have been identified with the keyhole pores dominating the samples processed by low laser power of 100 W. The keyhole pores increase in size at a high scan speed and hatch distances. By using higher laser power of 150 W, the keyhole pores reduced significantly while metallurgical pores appear. The result of the hardness test conducted on the samples shows that high values of hardness can be achieved with low scan speed.

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Effect of scanning strategies on residual stress and mechanical properties of Selective Laser Melted Ti6Al4V

Cited by 427 publications

References 26 publications

Fatigue behaviour of additive manufactured materials: An overview of some recent experimental studies on Ti‐6Al‐4V considering various processing and loading direction effects

Fatigue behaviour of additive manufactured materials: An overview of some recent experimental studies on Ti‐6Al‐4V considering various processing and loading direction effects

Effect of pre-emptive in situ parameter modification on residual stress distributions within selective laser-melted Ti6Al4V components

Experimental investigation of the effect of processing parameters on densification, microstructure and hardness of selective laser melted 7075 aluminium alloy

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