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Effect of processing parameters on the densification, microstructure and crystallographic texture during the laser powder bed fusion of pure tungsten

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Effect of processing parameters on the densification, microstructure and crystallographic texture during the laser powder bed fusion of pure tungsten. / Sidambe, A.T.; Tian, Y.; Prangnell, P.B. et al.
In: International Journal of Refractory Metals and Hard Materials, Vol. 78, 01.01.2019, p. 254-263.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

Sidambe, AT, Tian, Y, Prangnell, PB & Fox, P 2019, 'Effect of processing parameters on the densification, microstructure and crystallographic texture during the laser powder bed fusion of pure tungsten', International Journal of Refractory Metals and Hard Materials, vol. 78, pp. 254-263. https://doi.org/10.1016/j.ijrmhm.2018.10.004

APA

Sidambe, A. T., Tian, Y., Prangnell, P. B., & Fox, P. (2019). Effect of processing parameters on the densification, microstructure and crystallographic texture during the laser powder bed fusion of pure tungsten. International Journal of Refractory Metals and Hard Materials, 78, 254-263. https://doi.org/10.1016/j.ijrmhm.2018.10.004

Vancouver

Sidambe AT, Tian Y, Prangnell PB, Fox P. Effect of processing parameters on the densification, microstructure and crystallographic texture during the laser powder bed fusion of pure tungsten. International Journal of Refractory Metals and Hard Materials. 2019 Jan 1;78:254-263. Epub 2018 Oct 6. doi: 10.1016/j.ijrmhm.2018.10.004

Author

Sidambe, A.T. ; Tian, Y. ; Prangnell, P.B. et al. / Effect of processing parameters on the densification, microstructure and crystallographic texture during the laser powder bed fusion of pure tungsten. In: International Journal of Refractory Metals and Hard Materials. 2019 ; Vol. 78. pp. 254-263.

Bibtex

@article{cda9c455acb8441db0b051da69c688c1,
title = "Effect of processing parameters on the densification, microstructure and crystallographic texture during the laser powder bed fusion of pure tungsten",
abstract = "Laser Powder Bed Fusion is a leading additive manufacturing technology, which has been used successfully with a range of lower melting point materials (titanium alloys, nickel alloys, steels). This work looks to extend its use to refractory metals, such as those considered in this paper where the behaviour of pure tungsten powder is investigated. A strategy for fabricating high density parts was developed by creating a process map in which the effect of laser energy density was studied. The process quality was assessed using different techniques including light optical microscopy, XCT, SEM and EBSD. The results showed that the laser energy density was adequate to process tungsten to produce functional parts. The bulk density and optically determined densities, under different process conditions, ranged from 94 to 98%, but there was evidence of micro cracks and defects in specimens due to micro- and macro-scale residual stress. Analysis of the microstructure and local crystallographic texture showed that the melt pool formed under the laser beam favoured solidification in a preferred orientation by an epitaxial growth mechanism. The EBSD local texture analysis of the tungsten specimens showed a <111>//Z preferential fibre texture, parallel to the build direction.",
keywords = "3D printing, Additive manufacturing, High-temperature, Laser powder bed fusion, Refractory metals, Selective laser melting, Tungsten",
author = "A.T. Sidambe and Y. Tian and P.B. Prangnell and P. Fox",
year = "2019",
month = jan,
day = "1",
doi = "10.1016/j.ijrmhm.2018.10.004",
language = "English",
volume = "78",
pages = "254--263",
journal = "International Journal of Refractory Metals and Hard Materials",
issn = "0263-4368",
publisher = "Elsevier BV",

}

RIS

TY - JOUR

T1 - Effect of processing parameters on the densification, microstructure and crystallographic texture during the laser powder bed fusion of pure tungsten

AU - Sidambe, A.T.

AU - Tian, Y.

AU - Prangnell, P.B.

AU - Fox, P.

PY - 2019/1/1

Y1 - 2019/1/1

N2 - Laser Powder Bed Fusion is a leading additive manufacturing technology, which has been used successfully with a range of lower melting point materials (titanium alloys, nickel alloys, steels). This work looks to extend its use to refractory metals, such as those considered in this paper where the behaviour of pure tungsten powder is investigated. A strategy for fabricating high density parts was developed by creating a process map in which the effect of laser energy density was studied. The process quality was assessed using different techniques including light optical microscopy, XCT, SEM and EBSD. The results showed that the laser energy density was adequate to process tungsten to produce functional parts. The bulk density and optically determined densities, under different process conditions, ranged from 94 to 98%, but there was evidence of micro cracks and defects in specimens due to micro- and macro-scale residual stress. Analysis of the microstructure and local crystallographic texture showed that the melt pool formed under the laser beam favoured solidification in a preferred orientation by an epitaxial growth mechanism. The EBSD local texture analysis of the tungsten specimens showed a <111>//Z preferential fibre texture, parallel to the build direction.

AB - Laser Powder Bed Fusion is a leading additive manufacturing technology, which has been used successfully with a range of lower melting point materials (titanium alloys, nickel alloys, steels). This work looks to extend its use to refractory metals, such as those considered in this paper where the behaviour of pure tungsten powder is investigated. A strategy for fabricating high density parts was developed by creating a process map in which the effect of laser energy density was studied. The process quality was assessed using different techniques including light optical microscopy, XCT, SEM and EBSD. The results showed that the laser energy density was adequate to process tungsten to produce functional parts. The bulk density and optically determined densities, under different process conditions, ranged from 94 to 98%, but there was evidence of micro cracks and defects in specimens due to micro- and macro-scale residual stress. Analysis of the microstructure and local crystallographic texture showed that the melt pool formed under the laser beam favoured solidification in a preferred orientation by an epitaxial growth mechanism. The EBSD local texture analysis of the tungsten specimens showed a <111>//Z preferential fibre texture, parallel to the build direction.

KW - 3D printing

KW - Additive manufacturing

KW - High-temperature

KW - Laser powder bed fusion

KW - Refractory metals

KW - Selective laser melting

KW - Tungsten

U2 - 10.1016/j.ijrmhm.2018.10.004

DO - 10.1016/j.ijrmhm.2018.10.004

M3 - Journal article

VL - 78

SP - 254

EP - 263

JO - International Journal of Refractory Metals and Hard Materials

JF - International Journal of Refractory Metals and Hard Materials

SN - 0263-4368

ER -