Investigation on Multi-Layer Direct Metal Laser Sintering of 316L Stainless Steel Powder Beds

O’Neill, W; Sutcliffe, Christopher; Morgan, R.P.; Landsborough, A.; Hon, K.K.B.

doi:10.1016/s0007-8506(07)63153-9

Cited by 47 publications

(59 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Through multifiber beam delivery via power or time options, multiple processing operations can be simultaneously carried out by 87 employing a single Nd:YAG laser source [44]. A Nd:YAG laser beam will produce a slightly larger and more stable scan track than a CO 2 laser beam SLS/SLM processing [7,125,127,129]. Consequently, the wider Nd:YAG laser beam profile provides the ability to span large tracks while maintaining SLS/SLM build quality and speed, thus, leading to a more uniform scan track with little or no porosity [7,129].…”

Section: Effects Of Laser Types On the On The Processing And Densificmentioning

confidence: 99%

“…A Nd:YAG laser beam will produce a slightly larger and more stable scan track than a CO 2 laser beam SLS/SLM processing [7,125,127,129]. Consequently, the wider Nd:YAG laser beam profile provides the ability to span large tracks while maintaining SLS/SLM build quality and speed, thus, leading to a more uniform scan track with little or no porosity [7,129]. A Nd:YAG laser beam will operate at lower scanning speeds, in comparison to CO 2 laser beam, as a result of the reduced interaction among beam, plasma, and powder bed, thereby allowing increased powder's layer thickness to be melted [7,129].…”

Section: Effects Of Laser Types On the On The Processing And Densificmentioning

confidence: 99%

See 1 more Smart Citation

A review on selective laser sintering/melting (SLS/SLM) of aluminium alloy powders: Processing, microstructure, and properties

Olakanmi

Mullis

Dalgarno

2015

Progress in Materials Science

1,396

526

View full text Add to dashboard Cite

Section: Effects Of Laser Types On the On The Processing And Densificmentioning

confidence: 99%

Section: Effects Of Laser Types On the On The Processing And Densificmentioning

confidence: 99%

A review on selective laser sintering/melting (SLS/SLM) of aluminium alloy powders: Processing, microstructure, and properties

Olakanmi

Mullis

Dalgarno

2015

Progress in Materials Science

1,396

526

View full text Add to dashboard Cite

“…Reducing the laser power may result in insufficient melting of the powder, or decrease the depth of laser penetration into the powder layer to fully melt the powder and fuse successive layers together. Too much laser power can cause vaporization, which traps gas bubbles and creates porosity in the newly melted powder layers [12].…”

Section: Changing Laser Powermentioning

confidence: 99%

“…Previous research found that with increasing laser power, porosity decreased [4,7,8,10], and with less porosity we expect an increase in hardness as we found in this study. O'Neill et al concluded that higher energy density from higher laser power could vaporize the powder rather than melt it [12]. The gas pressure then propels the powder away from the melt pool resulting in porosity.…”

Section: Hardnessmentioning

confidence: 99%

The effects of laser powder bed fusion process parameters on material hardness and density for nickel alloy 625

Brown¹,

Jacob²,

Possolo³

et al. 2018

View full text Add to dashboard Cite

The goal of this study was to investigate the relationship between mechanical and material properties (including density) of manufactured nickel super alloy (IN625) using a laser powder bed fusion process and three process parameters: laser power, hatch distance, and scan speed. Hardness of the manufactured blocks was measured as a representative of the mechanical properties. Density measurements were carried out using the pyncometry method. Three sets of blocks were manufactured using IN625 metal powder (nitrogen gas atomized) on a laser powder bed fusion machine. Different combinations of process parameters yielded different energy densities for each block for the three builds. The laser scan speed, laser power, hatch distance, and energy density all had statistically significant relationships with hardness. The average bulk density increased non-linearly with increasing values of energy density. A similar trend was in the hardness data. The results of this study served as a guide to determine the range of parameters yielding acceptable material properties for the investigation of process parameter sensitivities during a subsequent IN625 round robin study.

show abstract

“…1(a)]. 22 In the system shown in this paper line optics is used to generate a long but narrow line for sintering [ Fig. 1(b)].…”

Section: Introductionmentioning

confidence: 99%

Rapid laser sintering of alkaline fuel cell substrates using integrating mirror

Garibay

Kaakkunen

Penttilä

et al. 2015

Journal of Laser Applications

View full text Add to dashboard Cite

Nickel screens and foams are commonly used in alkaline fuel cell (AFC) as substrates to support electrodes. The methods used for fabrication of these substrates impact significantly on the viability, with the material and processing cost of nickel comprising almost one third of the total. Therefore, improvements to the manufacturing speed of substrates would increase affordability. Currently, state of the art commercial selective laser sintering systems are limited to a volumetric manufacturing speed of 1–3 mm3/s. This study describes a novel technique that multiplies the sintering speed of nickel AFC substrates. The novel technique is based on an integrating mirror, which creates a homogenized 60 mm wide and 0.3 mm long beam from a Nd:YAG laser, and a 0.8 mm thick nickel powder layer in a nitrogen environment. The influence of the nickel powder characteristics, and sintering parameters, as velocity, laser power, etc., and postsintering treatments of the samples on the mechanical properties of the substrates were studied. Based on experimental results, the sintering speed could be multiplied up to a factor of 150 compared to the standard laser sintering speed. Additionally, because structure of the substrate has a significant impact on cell performance, a case study was defined to present the performance and characteristics of the sintered substrates on AFCs. Laser sintered substrates show promise, exhibiting a small performance drop of less than 25 mV (about 7%) compared to the in-house standard.

show abstract

Investigation on Multi-Layer Direct Metal Laser Sintering of 316L Stainless Steel Powder Beds

Cited by 47 publications

References 1 publication

A review on selective laser sintering/melting (SLS/SLM) of aluminium alloy powders: Processing, microstructure, and properties

A review on selective laser sintering/melting (SLS/SLM) of aluminium alloy powders: Processing, microstructure, and properties

The effects of laser powder bed fusion process parameters on material hardness and density for nickel alloy 625

Rapid laser sintering of alkaline fuel cell substrates using integrating mirror

Contact Info

Product

Resources

About