Effect of Elevated Temperatures on the Mechanical Properties of a Direct Laser Deposited Ti-6Al-4V

In the present work, the mechanical properties of the DLD-processed Ti-6Al-4V alloy were obtained by tensile tests performed at different temperatures, ranging from 20 °C to 800 °C. Thereby, the process conditions were close to the conditions used to produce large-sized structures using the DLD meth...

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Autores principales:	Sergei Ivanov, Marina Gushchina, Antoni Artinov, Maxim Khomutov, Evgenii Zemlyakov
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	direct laser deposition Ti-6Al-4V mechanical properties microstructure stress relaxation elevated temperatures Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/8564a829cfd9406baa4306b2aa15f6f4
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spelling	oai:doaj.org-article:8564a829cfd9406baa4306b2aa15f6f42021-11-11T18:00:24ZEffect of Elevated Temperatures on the Mechanical Properties of a Direct Laser Deposited Ti-6Al-4V10.3390/ma142164321996-1944https://doaj.org/article/8564a829cfd9406baa4306b2aa15f6f42021-10-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/21/6432https://doaj.org/toc/1996-1944In the present work, the mechanical properties of the DLD-processed Ti-6Al-4V alloy were obtained by tensile tests performed at different temperatures, ranging from 20 °C to 800 °C. Thereby, the process conditions were close to the conditions used to produce large-sized structures using the DLD method, resulting in specimens having the same initial martensitic microstructure. According to the obtained stress curves, the yield strength decreases gradually by 40% when the temperature is increased to 500 °C. Similar behavior is observed for the tensile strength. However, further heating above 500 °C leads to a significant increase in the softening rate. It was found that the DLD-processed Ti-6Al-4V alloy had a Young’s modulus with higher thermal stability than conventionally processed alloys. At 500 °C, the Young’s modulus of the DLD alloy was 46% higher than that of the wrought alloy. The influence of the thermal history on the stress relaxation for the cases where 500 °C and 700 °C were the maximum temperatures was studied. It was revealed that stress relaxation processes are decisive for the formation of residual stresses at temperatures above 700 °C, which is especially important for small-sized parts produced by the DLD method. The coefficient of thermal expansion was investigated up to 1050 °C.Sergei IvanovMarina GushchinaAntoni ArtinovMaxim KhomutovEvgenii ZemlyakovMDPI AGarticledirect laser depositionTi-6Al-4Vmechanical propertiesmicrostructurestress relaxationelevated temperaturesTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6432, p 6432 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	direct laser deposition Ti-6Al-4V mechanical properties microstructure stress relaxation elevated temperatures Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	direct laser deposition Ti-6Al-4V mechanical properties microstructure stress relaxation elevated temperatures Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Sergei Ivanov Marina Gushchina Antoni Artinov Maxim Khomutov Evgenii Zemlyakov Effect of Elevated Temperatures on the Mechanical Properties of a Direct Laser Deposited Ti-6Al-4V
description	In the present work, the mechanical properties of the DLD-processed Ti-6Al-4V alloy were obtained by tensile tests performed at different temperatures, ranging from 20 °C to 800 °C. Thereby, the process conditions were close to the conditions used to produce large-sized structures using the DLD method, resulting in specimens having the same initial martensitic microstructure. According to the obtained stress curves, the yield strength decreases gradually by 40% when the temperature is increased to 500 °C. Similar behavior is observed for the tensile strength. However, further heating above 500 °C leads to a significant increase in the softening rate. It was found that the DLD-processed Ti-6Al-4V alloy had a Young’s modulus with higher thermal stability than conventionally processed alloys. At 500 °C, the Young’s modulus of the DLD alloy was 46% higher than that of the wrought alloy. The influence of the thermal history on the stress relaxation for the cases where 500 °C and 700 °C were the maximum temperatures was studied. It was revealed that stress relaxation processes are decisive for the formation of residual stresses at temperatures above 700 °C, which is especially important for small-sized parts produced by the DLD method. The coefficient of thermal expansion was investigated up to 1050 °C.
format	article
author	Sergei Ivanov Marina Gushchina Antoni Artinov Maxim Khomutov Evgenii Zemlyakov
author_facet	Sergei Ivanov Marina Gushchina Antoni Artinov Maxim Khomutov Evgenii Zemlyakov
author_sort	Sergei Ivanov
title	Effect of Elevated Temperatures on the Mechanical Properties of a Direct Laser Deposited Ti-6Al-4V
title_short	Effect of Elevated Temperatures on the Mechanical Properties of a Direct Laser Deposited Ti-6Al-4V
title_full	Effect of Elevated Temperatures on the Mechanical Properties of a Direct Laser Deposited Ti-6Al-4V
title_fullStr	Effect of Elevated Temperatures on the Mechanical Properties of a Direct Laser Deposited Ti-6Al-4V
title_full_unstemmed	Effect of Elevated Temperatures on the Mechanical Properties of a Direct Laser Deposited Ti-6Al-4V
title_sort	effect of elevated temperatures on the mechanical properties of a direct laser deposited ti-6al-4v
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/8564a829cfd9406baa4306b2aa15f6f4
work_keys_str_mv	AT sergeiivanov effectofelevatedtemperaturesonthemechanicalpropertiesofadirectlaserdepositedti6al4v AT marinagushchina effectofelevatedtemperaturesonthemechanicalpropertiesofadirectlaserdepositedti6al4v AT antoniartinov effectofelevatedtemperaturesonthemechanicalpropertiesofadirectlaserdepositedti6al4v AT maximkhomutov effectofelevatedtemperaturesonthemechanicalpropertiesofadirectlaserdepositedti6al4v AT evgeniizemlyakov effectofelevatedtemperaturesonthemechanicalpropertiesofadirectlaserdepositedti6al4v
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Effect of Elevated Temperatures on the Mechanical Properties of a Direct Laser Deposited Ti-6Al-4V

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