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The Microstructure and Cracking Behaviors of Pure Molybdenum Fabricated by Selective Laser Melting
Selective laser melting (SLM) of pure molybdenum encounters all the difficulties of SLM metals due to its intrinsic properties (high melting point, high ductile-to-brittle transition temperature and high surface tension). In this work, we studied the influence of key factors such as powder morpholog...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9505115/ https://www.ncbi.nlm.nih.gov/pubmed/36143544 http://dx.doi.org/10.3390/ma15186230 |
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author | Yan, Anru Atif, Abbas Mirza Wang, Xiaobo Lan, Tian Wang, Zhiyong |
author_facet | Yan, Anru Atif, Abbas Mirza Wang, Xiaobo Lan, Tian Wang, Zhiyong |
author_sort | Yan, Anru |
collection | PubMed |
description | Selective laser melting (SLM) of pure molybdenum encounters all the difficulties of SLM metals due to its intrinsic properties (high melting point, high ductile-to-brittle transition temperature and high surface tension). In this work, we studied the influence of key factors such as powder morphology and processing parameters on SLM fabricated pure molybdenum. Pure molybdenum with a relative density of 99.1% was fabricated by SLM using optimized processing parameters. The formation mechanisms for densification behavior and crack growth behaviors are systematically analyzed. Electron backscattered diffraction analysis indicates that the interlocking grain boundary structure and stretch columnar grains can increase bonding force and inhibit crack growth. The balling and cracking can be reduced by adding support structure and suppressing oxygen content. The hardness of SLM-fabricated molybdenum exceeding 260 HV, which is 30–37% higher than Mo prepared by conventional manufacturing methods, mainly attributed to the fine grains and dislocation strengthening in the SLM process. The bending strength of SLM-ed Mo reached 280 ± 52 Mpa. The fracture mode of SLM Mo was intergranular. This study provides a new route for the fabrication of refractory metals with a complex structure. |
format | Online Article Text |
id | pubmed-9505115 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-95051152022-09-24 The Microstructure and Cracking Behaviors of Pure Molybdenum Fabricated by Selective Laser Melting Yan, Anru Atif, Abbas Mirza Wang, Xiaobo Lan, Tian Wang, Zhiyong Materials (Basel) Article Selective laser melting (SLM) of pure molybdenum encounters all the difficulties of SLM metals due to its intrinsic properties (high melting point, high ductile-to-brittle transition temperature and high surface tension). In this work, we studied the influence of key factors such as powder morphology and processing parameters on SLM fabricated pure molybdenum. Pure molybdenum with a relative density of 99.1% was fabricated by SLM using optimized processing parameters. The formation mechanisms for densification behavior and crack growth behaviors are systematically analyzed. Electron backscattered diffraction analysis indicates that the interlocking grain boundary structure and stretch columnar grains can increase bonding force and inhibit crack growth. The balling and cracking can be reduced by adding support structure and suppressing oxygen content. The hardness of SLM-fabricated molybdenum exceeding 260 HV, which is 30–37% higher than Mo prepared by conventional manufacturing methods, mainly attributed to the fine grains and dislocation strengthening in the SLM process. The bending strength of SLM-ed Mo reached 280 ± 52 Mpa. The fracture mode of SLM Mo was intergranular. This study provides a new route for the fabrication of refractory metals with a complex structure. MDPI 2022-09-08 /pmc/articles/PMC9505115/ /pubmed/36143544 http://dx.doi.org/10.3390/ma15186230 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Yan, Anru Atif, Abbas Mirza Wang, Xiaobo Lan, Tian Wang, Zhiyong The Microstructure and Cracking Behaviors of Pure Molybdenum Fabricated by Selective Laser Melting |
title | The Microstructure and Cracking Behaviors of Pure Molybdenum Fabricated by Selective Laser Melting |
title_full | The Microstructure and Cracking Behaviors of Pure Molybdenum Fabricated by Selective Laser Melting |
title_fullStr | The Microstructure and Cracking Behaviors of Pure Molybdenum Fabricated by Selective Laser Melting |
title_full_unstemmed | The Microstructure and Cracking Behaviors of Pure Molybdenum Fabricated by Selective Laser Melting |
title_short | The Microstructure and Cracking Behaviors of Pure Molybdenum Fabricated by Selective Laser Melting |
title_sort | microstructure and cracking behaviors of pure molybdenum fabricated by selective laser melting |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9505115/ https://www.ncbi.nlm.nih.gov/pubmed/36143544 http://dx.doi.org/10.3390/ma15186230 |
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