Cubierta

Effects of Different Si Content and Thermal Stories on the Secondary Phase Formation, Hot Ductility, and Stress Rupture Properties of Alloy 718 Investment Castings

Herein, the effects of microstructure on high-temperature properties (hot ductility and stress rupture life) were investigated in alloy 718 investment castings manufactured with different Si contents (0.051, 0.11, and 0.17 wt pct) and different cooling rates (0.52 °C/s and 1.65 °C/s). For the castin...

Descripción completa

Idioma: English
Publicación: Springer 2023
Acceso electrónico SOLREBILTEGIA: https://hdl.handle.net/20.500.11984/6094
https://doi.org/10.1007/s11661-023-07046-4
https://katalogoa.mondragon.edu/janium-bin/janium_login_opac.pl?find&ficha_no=172730
Ampliar información
id ebiltegia-20.500.11984-6094
recordtype ebiltegia
spelling ebiltegia-20.500.11984-60942024-03-04T11:23:17Zcom_20.500.11984_473Ikerketa-Artikuluakcol_20.500.11984_478Artikuluak-Ingeniaritza Effects of Different Si Content and Thermal Stories on the Secondary Phase Formation, Hot Ductility, and Stress Rupture Properties of Alloy 718 Investment Castings Bernal, Daniel Niklas, Andrea Santos, Fernando Gonzalez-Martinez, Rodolfo Cobos, Alberto Vázquez, Lexuri Lexuri Álvarez, Pedro Herein, the effects of microstructure on high-temperature properties (hot ductility and stress rupture life) were investigated in alloy 718 investment castings manufactured with different Si contents (0.051, 0.11, and 0.17 wt pct) and different cooling rates (0.52 °C/s and 1.65 °C/s). For the casting with a low cooling rate, an additional solution treatment step was added to the standard pre-weld heat treatment. Even small amounts of residual Laves phase (0.14 to 0.35 wt pct) adversely affected both the hot ductility and stress rupture properties. Hot ductility tests indicated that the presence of Laves phase led to an earlier decrease in hot ductility in on-heating tests and retarded ductility recovery in on-cooling tests. Both effects are usually associated with poorer weldability and greater hot cracking susceptibility. Ductility recovery was also affected by grain size and aspect ratio: columnar and smaller grain sizes showed better ductility recovery behavior. Stress rupture tests indicated that stress rupture life and elongation decreased with increasing Si content, due to the presence of a semicontinuous network of Laves phase at grain boundaries instead of intergranular δ phases. This effect was much more pronounced in stress rupture than in hot ductility tests. The presence of residual Laves phase was associated with higher Si content and lower cooling rates. The additional solution treatment step of 2 hours at 1052 °C did not eliminate the Laves phase completely. Gobierno Vasco Gobierno Vasco Comisión Europea 2023-06-12T12:51:35Z 2023-06-12T12:51:35Z 2023 2024-07-31 https://hdl.handle.net/20.500.11984/6094 1543-1940 https://doi.org/10.1007/s11661-023-07046-4 https://katalogoa.mondragon.edu/janium-bin/janium_login_opac.pl?find&ficha_no=172730 eng info:eu-repo/grantAgreement/GV/Elkartek 2020/KK-2020-00047/CAPV/Desarrollo de materiales cerámicos y metálicos de altas prestaciones para fabricación avanzada/CEMAP info:eu-repo/grantAgreement/GV/Elkartek 2022/KK-2022-00082/CAPV/Diseño avanzado y desarrollo materiales para la fabricación de nuevos productos para energía y movilidad más sostenibles empleando herramientas de modelización y análisis de datos/MINERVA info:eu-repo/grantAgreement/EC/H2020/755561/EU/Development of investment casting process of nickel superalloys with enhanced weldability/HiperTURB © The Minerals, Metals & Materials Society and ASM International 2023 application/pdf Springer Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science Vol. 54. Pp. 2670–2688, 2023
external_data_source Ebiltegia
institution Digital
collection Ebiltegia
language English
description Herein, the effects of microstructure on high-temperature properties (hot ductility and stress rupture life) were investigated in alloy 718 investment castings manufactured with different Si contents (0.051, 0.11, and 0.17 wt pct) and different cooling rates (0.52 °C/s and 1.65 °C/s). For the casting with a low cooling rate, an additional solution treatment step was added to the standard pre-weld heat treatment. Even small amounts of residual Laves phase (0.14 to 0.35 wt pct) adversely affected both the hot ductility and stress rupture properties. Hot ductility tests indicated that the presence of Laves phase led to an earlier decrease in hot ductility in on-heating tests and retarded ductility recovery in on-cooling tests. Both effects are usually associated with poorer weldability and greater hot cracking susceptibility. Ductility recovery was also affected by grain size and aspect ratio: columnar and smaller grain sizes showed better ductility recovery behavior. Stress rupture tests indicated that stress rupture life and elongation decreased with increasing Si content, due to the presence of a semicontinuous network of Laves phase at grain boundaries instead of intergranular δ phases. This effect was much more pronounced in stress rupture than in hot ductility tests. The presence of residual Laves phase was associated with higher Si content and lower cooling rates. The additional solution treatment step of 2 hours at 1052 °C did not eliminate the Laves phase completely.
author_additional Niklas, Andrea
author Bernal, Daniel
spellingShingle Bernal, Daniel
Effects of Different Si Content and Thermal Stories on the Secondary Phase Formation, Hot Ductility, and Stress Rupture Properties of Alloy 718 Investment Castings
title Effects of Different Si Content and Thermal Stories on the Secondary Phase Formation, Hot Ductility, and Stress Rupture Properties of Alloy 718 Investment Castings
title_short Effects of Different Si Content and Thermal Stories on the Secondary Phase Formation, Hot Ductility, and Stress Rupture Properties of Alloy 718 Investment Castings
title_full Effects of Different Si Content and Thermal Stories on the Secondary Phase Formation, Hot Ductility, and Stress Rupture Properties of Alloy 718 Investment Castings
title_fullStr Effects of Different Si Content and Thermal Stories on the Secondary Phase Formation, Hot Ductility, and Stress Rupture Properties of Alloy 718 Investment Castings
title_full_unstemmed Effects of Different Si Content and Thermal Stories on the Secondary Phase Formation, Hot Ductility, and Stress Rupture Properties of Alloy 718 Investment Castings
title_sort effects of different si content and thermal stories on the secondary phase formation, hot ductility, and stress rupture properties of alloy 718 investment castings
publisher Springer
publishDate 2023
url https://hdl.handle.net/20.500.11984/6094
https://doi.org/10.1007/s11661-023-07046-4
https://katalogoa.mondragon.edu/janium-bin/janium_login_opac.pl?find&ficha_no=172730
_version_ 1792663702573416448

Ejemplares similares