Effects of laser processing parameters on thermal behavior and melting/solidification mechanism during selective laser melting of TiC/Inconel 718 composites

Shi, Qimin; Gu, Dongdong; Xia, Mujian; Cao, Sainan; Rong, Ting

doi:10.1016/j.optlastec.2016.04.009

Cited by 235 publications

(79 citation statements)

References 30 publications

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“…With the above advantages, SLM has been widely employed in the manufacture of metallic parts for the aerospace and automobile industries. 12,[14][15][16] If one could use SLM in the parallel production of pand n-type TE legs, as well as in rapid joining of TE legs to electrodes and insulating substrates, the fabrication of TE modules would be carried out in just one integrated step with much improved efficiency and reduced cost. The key element in the SLM-based technique of TE module manufacturing is the fabrication of TE legs with good control over their chemical composition, phase, microstructure and TE performance.…”

Section: Introductionmentioning

confidence: 99%

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Non-equilibrium synthesis and characterization of n-type Bi₂Te_2.7Se_0.3 thermoelectric material prepared by rapid laser melting and solidification

Mao

Yan

et al. 2017

RSC Adv.

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Commercial production of thermoelectric (TE) modules features energy-intensive and time-consuming processes. Here, we propose a rapid, facile and low cost fabrication process for n-type single phase Bi 2 Te 2.7 Se 0.3 that combines self-propagating high-temperature synthesis (SHS) with the laser nonequilibrium 3D printing method based on selective laser melting (SLM). The optimal SLM processing window for high quality single layers has been determined. Results show that the chemical composition of the sample is very sensitive to the laser energy density (E V ) due to the selective vaporization of Se and Te. For energy densities E V of less than 33.3 J mm À3, the composition of the SLM-processed samples is relatively stable. However, as E V exceeds 33.3 J mm À3 and increases further, the vaporization rate of Te and Se significantly increases and is much higher than that of Bi. Empirical formulae relating the chemical composition of the resulting materials with the values of E V are obtained and are used to predict the composition of the SLM-processed material. Most importantly, the temperature dependent TE properties of the SLM-fabricated bulk sample result in a maximum ZT value of 0.84 at 400 K, which is comparable to that of the commercially available material. The work has laid a foundation for the future utilization of this technique for the fabrication of Bi 2 Te 3 -based thermoelectric modules.

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Section: Introductionmentioning

confidence: 99%

“…[16][17][18][19] Moreover, physical properties of structural materials are mainly affected by the microstructure and the forming quality. In contrast, thermoelectric materials are semiconductors that usually possess a lower melting point, lower thermal conductivity, poor ductility and weak thermal shock resistance.…”

Section: Introductionmentioning

confidence: 99%

Non-equilibrium synthesis and characterization of n-type Bi₂Te_2.7Se_0.3 thermoelectric material prepared by rapid laser melting and solidification

Mao

Yan

et al. 2017

RSC Adv.

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“…The main reason behind the limitation in the range of processable materials is linked to the elevated thermal gradients and cooling rates that are experienced locally during the fusion process and are intrinsic to the technology due to the concentrated energy beam required to melt the powder bed. Cooling velocities greater than 10 6 K s −1 have been measured experimentally by Scipioni et al [2] while Shi et al estimate thermal gradients above 10 4 K mm −1 [3]. As clearly explained by Hagedorn et al these values are critical when processing metallic powders due to the elevated stress concentrations which are generated [4].…”

Section: Introductionmentioning

confidence: 92%

Defect-free laser powder bed fusion of Ti–48Al–2Cr–2Nb with a high temperature inductive preheating system

et al. 2020

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In the industrial panorama, laser powder bed fusion (LPBF) systems enable the near net shaping of metal powders into complex geometries with unique design features. This makes the technology appealing for many industrial applications, which require high performance materials combined with lightweight design, lattice structures and organic forms. However, many of the alloys that would be ideal for the realisation of these functional components are classified as difficult to weld due to their cracking sensitivity. γ-TiAl alloys are currently processed via electron beam melting (EBM) to produce components for energy generation applications. The EBM process provides crack-free processing thanks to the preheating stages between layers, but lacks geometrical precision. The use of LPBF could provide the means for higher precision, and therefore an easier post-processing stage. However, industrial LPBF systems employ resistive heating elements underneath the base plate which do not commonly reach the high temperatures required for the processing of γ-TiAl alloys. Thus, elevated temperature preheating of the build part and control over the cooling rate after the deposition process is concluded are amongst the features which require further investigations. In this work, the design and implementation of a novel inductive high temperature LPBF system to process Ti-48Al-2Cr-2Nb is presented. Specimens were built with preheating at 800°C and the cooling rate at the end of the build was controlled at 5°C min −1 . Crack formation was suppressed and apparent density in excess of 99% was achieved.

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“…The same steps followed for the fabrication of the dummy prototype have been applied for the fabrication of the final prototype. Literature studies [26,27] on the effect of the DMLS settings and on the positioning of the part have been taken into account to maximize the desired mechanical and geometrical properties.…”

Section: Modementioning

confidence: 99%

Design and Production of Innovative Turbomachinery Components via Topology Optimization and Additive Manufacturing

Meli

Rindi

Ridolfi

et al. 2019

International Journal of Rotating Machinery

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The present paper proposes a methodology to design and manufacture optimized turbomachinery components by leveraging the potential of Topology Optimization (TO) and Additive Manufacturing (AM). The method envisages the use of TO to define the best configuration of the rotoric components in terms of both static and dynamic behavior with a resultant reduction of overall weight. Eventually, the topology-optimized component is manufactured by using appropriate materials that can guarantee valid mechanical performances. The proposed strategy has been applied to a 2D impeller used for centrifugal compressors to prove the effectiveness of a TO+AM-based approach. Although this approach has never been extensively used before to centrifugal compressors and expanders, its application on rotor and stator components might unlock several benefits: tuning the natural frequencies, a reduction in the stress level, and a lighter weight of the rotating part. These objectives can be reached alone or in combination, performing a single analysis or a multiple analyses optimization. Finally, the introduction of AM technologies as standard manufacturing resources could bring sensible benefits with respect to the time to production and availability of components. Such aspects are essential in the Oil and Gas context, when dealing with new projects but also for service operations.

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Effects of laser processing parameters on thermal behavior and melting/solidification mechanism during selective laser melting of TiC/Inconel 718 composites

Cited by 235 publications

References 30 publications

Non-equilibrium synthesis and characterization of n-type Bi₂Te_2.7Se_0.3 thermoelectric material prepared by rapid laser melting and solidification

Non-equilibrium synthesis and characterization of n-type Bi₂Te_2.7Se_0.3 thermoelectric material prepared by rapid laser melting and solidification

Defect-free laser powder bed fusion of Ti–48Al–2Cr–2Nb with a high temperature inductive preheating system

Design and Production of Innovative Turbomachinery Components via Topology Optimization and Additive Manufacturing

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Effects of laser processing parameters on thermal behavior and melting/solidification mechanism during selective laser melting of TiC/Inconel 718 composites

Cited by 235 publications

References 30 publications

Non-equilibrium synthesis and characterization of n-type Bi2Te2.7Se0.3 thermoelectric material prepared by rapid laser melting and solidification

Non-equilibrium synthesis and characterization of n-type Bi2Te2.7Se0.3 thermoelectric material prepared by rapid laser melting and solidification

Defect-free laser powder bed fusion of Ti–48Al–2Cr–2Nb with a high temperature inductive preheating system

Design and Production of Innovative Turbomachinery Components via Topology Optimization and Additive Manufacturing

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Non-equilibrium synthesis and characterization of n-type Bi₂Te_2.7Se_0.3 thermoelectric material prepared by rapid laser melting and solidification

Non-equilibrium synthesis and characterization of n-type Bi₂Te_2.7Se_0.3 thermoelectric material prepared by rapid laser melting and solidification