Optimisation of process parameters to address fundamental challenges during selective laser melting of Ti-6Al-4V: A review

Shipley, Harry; McDonnell, D.; Culleton, Mark; Coull, Richard; Lupoi, Rocco; O’Donnell, Garret E.; Trimble, Daniel

doi:10.1016/j.ijmachtools.2018.01.003

Cited by 460 publications

(180 citation statements)

References 91 publications

Supporting

Mentioning

165

Contrasting

Unclassified

Order By: Relevance

“…In order to achieve fully dense parts, an optimisation study involving the laser parameters (laser power (P) and scan speed (v)) was performed in the ranges of 60-120 W and 150-600 mm/s, respectively. To describe an equivalent value for the heat input, the volumetric energy density (E v ) was used, as defined as E v =P/(v×h×t) [25]. The laser was scanned in a continuous raster pattern with 'meander on' and 0.1 ms corners delay.…”

Section: Materials and Processingmentioning

confidence: 99%

Laser Powder Bed Fusion of Ti-rich TiNi lattice structures: Process optimisation, geometrical integrity, and phase transformations

Tan

Essa

et al. 2019

International Journal of Machine Tools and Manufacture

111

View full text Add to dashboard Cite

Where a licence is displayed above, please note the terms and conditions of the licence govern your use of this document. When citing, please reference the published version. Take down policy While the University of Birmingham exercises care and attention in making items available there are rare occasions when an item has been uploaded in error or has been deemed to be commercially or otherwise sensitive.

show abstract

Section: Materials and Processingmentioning

confidence: 99%

Laser Powder Bed Fusion of Ti-rich TiNi lattice structures: Process optimisation, geometrical integrity, and phase transformations

Tan

Essa

et al. 2019

International Journal of Machine Tools and Manufacture

111

View full text Add to dashboard Cite

show abstract

“…Shipley et al conducted a process optimization with the primary goal of maximizing part density, they identified the cooling rate to be important for the microstructural evolution and proposed methods to maintain a high energy input, which results in high cooling rates, thereby tailoring the microstructure and reducing residual stresses [13]. Evaluation of dimensional accuracy is a popular topic in AM research [14] as these technologies hold a lot of potential for application in research as well as industry.…”

Section: Introductionmentioning

confidence: 99%

Effect of Process Parameters on the Generated Surface Roughness of Down-Facing Surfaces in Selective Laser Melting

et al. 2019

View full text Add to dashboard Cite

Additive manufacturing provides a number of benefits in terms of infinite freedom to design complex parts and reduced lead-times while globally reducing the size of supply chains as it brings all production processes under one roof. However, additive manufacturing (AM) lags far behind conventional manufacturing in terms of surface quality. This proves a hindrance for many companies considering investment in AM. The aim of this work is to investigate the effect of varying process parameters on the resultant roughness of the down-facing surfaces in selective laser melting (SLM). A systematic experimental study was carried out and the effects of the interaction of the different parameters and their effect on the surface roughness (Sa) were analyzed. It was found that the interaction and interdependency between parameters were of greatest significance to the obtainable surface roughness, though their effects vary greatly depending on the applied levels. This behavior was mainly attributed to the difference in energy absorbed by the powder. Predictive process models for optimization of process parameters for minimizing the obtained Sa in 45° and 35° down-facing surface, individually, were achieved with average error percentages of 5% and 6.3%, respectively, however further investigation is still warranted.

show abstract

“…8 Except for the last preceding layer, the other preceding layers stay at a lower temperature because of the low thermal conductivity of the Ti-6Al-4V alloy. 1,5 The area of the scanned layer slightly expands during the action. The increase of the ED causes an increase of the temperature at the scanning area that causes a higher melt pool volume as well as the higher expansion of material that reduces the crystallinity.…”

Section: Cuboid Samples Dimensionsmentioning

confidence: 99%

“…4 The production process consists of the highly localized fusing of metal particles, during which many thermodynamic and physical phenomena occur in a very short time. 5 The temperature of the action area rises suddenly and creates a small melt pool, which in turn cools down rapidly, solidifies and undergoes several phase changes. This process induces expansion and shrinkage during the manufacturing of each track and layer, respectively.…”

Section: Introductionmentioning

confidence: 99%

Dimensional errors in selective laser melting products related to different orientations and processing parameters

Pal¹,

Kokol²,

Gubeljak³

et al. 2019

Mater. Tehnol.

View full text Add to dashboard Cite

This research has investigated the changes of dimensions with changes of the Energy Density (ED), processing parameters and build up direction wise of Ti-6Al-4V alloy products manufactured by the Selective Laser Melting (SLM) process. The selected processing parameters were laser power, scanning speed, and hatch spacing in several combinations, keeping the layer thickness constant during all three steps of the studies. Four orientations have been considered for a specimen to build up in different directions for each of the selected combinations of processing parameters. The SLM process is characterized by the high laser energy inputs into a metallic powder layer in a short interaction time that occurs several thermal related issues that significantly affect the shape and dimensions of the part. The results show that ED, as well as its processing parameters, have significant influences on the product's dimensions. The building orientation has a great impact on the dimensional accuracy.

show abstract

Optimisation of process parameters to address fundamental challenges during selective laser melting of Ti-6Al-4V: A review

Cited by 460 publications

References 91 publications

Laser Powder Bed Fusion of Ti-rich TiNi lattice structures: Process optimisation, geometrical integrity, and phase transformations

Laser Powder Bed Fusion of Ti-rich TiNi lattice structures: Process optimisation, geometrical integrity, and phase transformations

Effect of Process Parameters on the Generated Surface Roughness of Down-Facing Surfaces in Selective Laser Melting

Dimensional errors in selective laser melting products related to different orientations and processing parameters

Contact Info

Product

Resources

About