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High-density tungsten fabricated by selective laser melting: Densification, microstructure, mechanical and thermal performance

High-density tungsten fabricated by selective laser melting: Densification, microstructure, mechanical and thermal performance
High-density tungsten fabricated by selective laser melting: Densification, microstructure, mechanical and thermal performance

High-density pure tungsten (W) fabricated by selective laser melting (SLM) has been considered as a substantial challenge due to its high melting point of 3410 °C. In this study, near fully dense W samples with a relative density of 98.71% were obtained for the first time through a series of optimization experiments during the SLM process. The characteristics of the surface and the formation mechanism of the micro defects were systematically elucidated. Additionally, it was found that the typical microstructures of horizontal and vertical planes experienced successive changes, where coarser columnar grains changed to uniform finer grains when increasing the laser scan speed from 50 mm/s to 400 mm/s. The compressive strength, micro hardness and thermal conductivity of the optimal SLM sample was improved to 1523 MPa, 428 HV 3 and 148 W/m·K, which were superior to the sample produced by the conventional methods. The relationship of processing parameters to the surface morphology and microstructure evolution and material properties associated with fusion reactors was established in order to optimize the performance of SLM pure W and explore the possibility of further application in fusion reactors.

Compressive strength, Hardness, Microstructure, Selective laser melting (SLM), Thermal conductivity, Tungsten (W)
0030-3992
128-138
Wen, Shifeng
36deff92-8b62-476f-8265-faf2dcf501f6
Wang, Chong
349e9492-0926-40d3-941d-9aae7967aa56
Zhou, Yan
7ffa57ee-d3eb-420c-a5a2-67b2330a0757
Duan, Longchen
fca83845-f935-4aa0-851a-827334f514da
Wei, Qingsong
e753f610-9fb9-43c4-98e9-60d48895c8da
Yang, Shoufeng
e0018adf-8123-4a54-b8dd-306c10ca48f1
Shi, Yusheng
c5e10cdc-0c6e-4de9-877d-9b83955e0955
Wen, Shifeng
36deff92-8b62-476f-8265-faf2dcf501f6
Wang, Chong
349e9492-0926-40d3-941d-9aae7967aa56
Zhou, Yan
7ffa57ee-d3eb-420c-a5a2-67b2330a0757
Duan, Longchen
fca83845-f935-4aa0-851a-827334f514da
Wei, Qingsong
e753f610-9fb9-43c4-98e9-60d48895c8da
Yang, Shoufeng
e0018adf-8123-4a54-b8dd-306c10ca48f1
Shi, Yusheng
c5e10cdc-0c6e-4de9-877d-9b83955e0955

Wen, Shifeng, Wang, Chong, Zhou, Yan, Duan, Longchen, Wei, Qingsong, Yang, Shoufeng and Shi, Yusheng (2019) High-density tungsten fabricated by selective laser melting: Densification, microstructure, mechanical and thermal performance. Optics and Laser Technology, 116, 128-138. (doi:10.1016/j.optlastec.2019.03.018).

Record type: Article

Abstract

High-density pure tungsten (W) fabricated by selective laser melting (SLM) has been considered as a substantial challenge due to its high melting point of 3410 °C. In this study, near fully dense W samples with a relative density of 98.71% were obtained for the first time through a series of optimization experiments during the SLM process. The characteristics of the surface and the formation mechanism of the micro defects were systematically elucidated. Additionally, it was found that the typical microstructures of horizontal and vertical planes experienced successive changes, where coarser columnar grains changed to uniform finer grains when increasing the laser scan speed from 50 mm/s to 400 mm/s. The compressive strength, micro hardness and thermal conductivity of the optimal SLM sample was improved to 1523 MPa, 428 HV 3 and 148 W/m·K, which were superior to the sample produced by the conventional methods. The relationship of processing parameters to the surface morphology and microstructure evolution and material properties associated with fusion reactors was established in order to optimize the performance of SLM pure W and explore the possibility of further application in fusion reactors.

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More information

Accepted/In Press date: 13 March 2019
e-pub ahead of print date: 21 March 2019
Published date: 1 August 2019
Keywords: Compressive strength, Hardness, Microstructure, Selective laser melting (SLM), Thermal conductivity, Tungsten (W)

Identifiers

Local EPrints ID: 431938
URI: http://eprints.soton.ac.uk/id/eprint/431938
ISSN: 0030-3992
PURE UUID: d0798ac5-3b7f-494c-8da6-d153b049263d
ORCID for Shoufeng Yang: ORCID iD orcid.org/0000-0002-3888-3211

Catalogue record

Date deposited: 21 Jun 2019 16:30
Last modified: 09 Jan 2022 01:03

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Contributors

Author: Shifeng Wen
Author: Chong Wang
Author: Yan Zhou
Author: Longchen Duan
Author: Qingsong Wei
Author: Shoufeng Yang ORCID iD
Author: Yusheng Shi

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