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Optimization of the Post-Process Heat Treatment Strategy for a Near-α Titanium Base Alloy Produced by Laser Powder Bed Fusion

During the last decades, titanium alloys have been of great interest for lightweight applications due to their high strength in combination with a low material density. Current research activities focus on the investigation of near-α titanium alloys produced by laser powder bed fusion (LPBF). These...

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Autores principales: Fleißner-Rieger, Christian, Pfeifer, Tanja, Turk, Christoph, Clemens, Helmut
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8839572/
https://www.ncbi.nlm.nih.gov/pubmed/35160977
http://dx.doi.org/10.3390/ma15031032
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author Fleißner-Rieger, Christian
Pfeifer, Tanja
Turk, Christoph
Clemens, Helmut
author_facet Fleißner-Rieger, Christian
Pfeifer, Tanja
Turk, Christoph
Clemens, Helmut
author_sort Fleißner-Rieger, Christian
collection PubMed
description During the last decades, titanium alloys have been of great interest for lightweight applications due to their high strength in combination with a low material density. Current research activities focus on the investigation of near-α titanium alloys produced by laser powder bed fusion (LPBF). These alloys are known for their superior tensile strength and high creep resistance. This study focuses on the optimization of post-process heat treatments and the impact on tensile and creep strength of a LPBF produced Ti6242S alloy. Therefore, a variety of annealing steps were conducted to gain knowledge about the decomposition process of the non-equilibrium as-built microstructure and the arising influence on the mechanical properties. Components made of Ti6242S and produced by LPBF reveal an extraordinarily high ultimate tensile strength of about 1530 MPa at room temperature, but show a low elongation at fracture (A(5) = 4.3%). Based on microstructure-property relationships, this study recommends precise heat treatments on how to improve the desired mechanical properties in terms of strength, ductility as well as creep resistance. Moreover, this study shows a triplex heat treatment, which enhances the elongation at fracture (A(5)) to 16.5%, while the ultimate tensile strength is still at 1100 MPa.
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spelling pubmed-88395722022-02-13 Optimization of the Post-Process Heat Treatment Strategy for a Near-α Titanium Base Alloy Produced by Laser Powder Bed Fusion Fleißner-Rieger, Christian Pfeifer, Tanja Turk, Christoph Clemens, Helmut Materials (Basel) Article During the last decades, titanium alloys have been of great interest for lightweight applications due to their high strength in combination with a low material density. Current research activities focus on the investigation of near-α titanium alloys produced by laser powder bed fusion (LPBF). These alloys are known for their superior tensile strength and high creep resistance. This study focuses on the optimization of post-process heat treatments and the impact on tensile and creep strength of a LPBF produced Ti6242S alloy. Therefore, a variety of annealing steps were conducted to gain knowledge about the decomposition process of the non-equilibrium as-built microstructure and the arising influence on the mechanical properties. Components made of Ti6242S and produced by LPBF reveal an extraordinarily high ultimate tensile strength of about 1530 MPa at room temperature, but show a low elongation at fracture (A(5) = 4.3%). Based on microstructure-property relationships, this study recommends precise heat treatments on how to improve the desired mechanical properties in terms of strength, ductility as well as creep resistance. Moreover, this study shows a triplex heat treatment, which enhances the elongation at fracture (A(5)) to 16.5%, while the ultimate tensile strength is still at 1100 MPa. MDPI 2022-01-28 /pmc/articles/PMC8839572/ /pubmed/35160977 http://dx.doi.org/10.3390/ma15031032 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
Fleißner-Rieger, Christian
Pfeifer, Tanja
Turk, Christoph
Clemens, Helmut
Optimization of the Post-Process Heat Treatment Strategy for a Near-α Titanium Base Alloy Produced by Laser Powder Bed Fusion
title Optimization of the Post-Process Heat Treatment Strategy for a Near-α Titanium Base Alloy Produced by Laser Powder Bed Fusion
title_full Optimization of the Post-Process Heat Treatment Strategy for a Near-α Titanium Base Alloy Produced by Laser Powder Bed Fusion
title_fullStr Optimization of the Post-Process Heat Treatment Strategy for a Near-α Titanium Base Alloy Produced by Laser Powder Bed Fusion
title_full_unstemmed Optimization of the Post-Process Heat Treatment Strategy for a Near-α Titanium Base Alloy Produced by Laser Powder Bed Fusion
title_short Optimization of the Post-Process Heat Treatment Strategy for a Near-α Titanium Base Alloy Produced by Laser Powder Bed Fusion
title_sort optimization of the post-process heat treatment strategy for a near-α titanium base alloy produced by laser powder bed fusion
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8839572/
https://www.ncbi.nlm.nih.gov/pubmed/35160977
http://dx.doi.org/10.3390/ma15031032
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