Cargando…

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...

Descripción completa

Detalles Bibliográficos
Autores principales: Yan, Anru, Atif, Abbas Mirza, Wang, Xiaobo, Lan, Tian, Wang, Zhiyong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
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
_version_ 1784796391941341184
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
work_keys_str_mv AT yananru themicrostructureandcrackingbehaviorsofpuremolybdenumfabricatedbyselectivelasermelting
AT atifabbasmirza themicrostructureandcrackingbehaviorsofpuremolybdenumfabricatedbyselectivelasermelting
AT wangxiaobo themicrostructureandcrackingbehaviorsofpuremolybdenumfabricatedbyselectivelasermelting
AT lantian themicrostructureandcrackingbehaviorsofpuremolybdenumfabricatedbyselectivelasermelting
AT wangzhiyong themicrostructureandcrackingbehaviorsofpuremolybdenumfabricatedbyselectivelasermelting
AT yananru microstructureandcrackingbehaviorsofpuremolybdenumfabricatedbyselectivelasermelting
AT atifabbasmirza microstructureandcrackingbehaviorsofpuremolybdenumfabricatedbyselectivelasermelting
AT wangxiaobo microstructureandcrackingbehaviorsofpuremolybdenumfabricatedbyselectivelasermelting
AT lantian microstructureandcrackingbehaviorsofpuremolybdenumfabricatedbyselectivelasermelting
AT wangzhiyong microstructureandcrackingbehaviorsofpuremolybdenumfabricatedbyselectivelasermelting