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Tensile Notch Sensitivity of Additively Manufactured IN 625 Superalloy
The notch sensitivity of additively manufactured IN 625 superalloy produces by laser powder bed fusion (LPBF) has been investigated by tensile testing of cylindrical test pieces. Smooth and V-notched test pieces with four different radii were tested both in as-built state and after a stress relief h...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7663153/ https://www.ncbi.nlm.nih.gov/pubmed/33138294 http://dx.doi.org/10.3390/ma13214859 |
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author | Matache, Gheorghe Paraschiv, Alexandru Condruz, Mihaela Raluca |
author_facet | Matache, Gheorghe Paraschiv, Alexandru Condruz, Mihaela Raluca |
author_sort | Matache, Gheorghe |
collection | PubMed |
description | The notch sensitivity of additively manufactured IN 625 superalloy produces by laser powder bed fusion (LPBF) has been investigated by tensile testing of cylindrical test pieces. Smooth and V-notched test pieces with four different radii were tested both in as-built state and after a stress relief heat treatment for 1 h at 900 °C. Regardless of the notch root radius, the investigated alloy exhibits notch strength ratios higher than unity in both as-built and in stress-relieved states, showing that the additive manufactured IN 625 alloy is not prone to brittleness induced by the presence of V-notches. Higher values of notch strength ratios were recorded for the as-built material as a result of the higher internal stress level induced by the manufacturing process. Due to the higher triaxiality of stresses induced by notches, for both as-built and stress-relieved states, the proof strength of the notched test pieces is even higher than the tensile strength of the smooth test pieces tested in the same conditions. SEM fractographic analysis revealed a mixed mode of ductile and brittle fracture morphology of the V-notched specimens regardless the notch root radius. A more dominant ductile mode of fracture was encountered for stress-relieved test pieces than in the case of the as-built state. However, future research is needed to better understand the influence of notches on additive manufactured IN 625 alloy behaviour under more complex stresses. |
format | Online Article Text |
id | pubmed-7663153 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-76631532020-11-14 Tensile Notch Sensitivity of Additively Manufactured IN 625 Superalloy Matache, Gheorghe Paraschiv, Alexandru Condruz, Mihaela Raluca Materials (Basel) Article The notch sensitivity of additively manufactured IN 625 superalloy produces by laser powder bed fusion (LPBF) has been investigated by tensile testing of cylindrical test pieces. Smooth and V-notched test pieces with four different radii were tested both in as-built state and after a stress relief heat treatment for 1 h at 900 °C. Regardless of the notch root radius, the investigated alloy exhibits notch strength ratios higher than unity in both as-built and in stress-relieved states, showing that the additive manufactured IN 625 alloy is not prone to brittleness induced by the presence of V-notches. Higher values of notch strength ratios were recorded for the as-built material as a result of the higher internal stress level induced by the manufacturing process. Due to the higher triaxiality of stresses induced by notches, for both as-built and stress-relieved states, the proof strength of the notched test pieces is even higher than the tensile strength of the smooth test pieces tested in the same conditions. SEM fractographic analysis revealed a mixed mode of ductile and brittle fracture morphology of the V-notched specimens regardless the notch root radius. A more dominant ductile mode of fracture was encountered for stress-relieved test pieces than in the case of the as-built state. However, future research is needed to better understand the influence of notches on additive manufactured IN 625 alloy behaviour under more complex stresses. MDPI 2020-10-29 /pmc/articles/PMC7663153/ /pubmed/33138294 http://dx.doi.org/10.3390/ma13214859 Text en © 2020 by the authors. 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 (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Matache, Gheorghe Paraschiv, Alexandru Condruz, Mihaela Raluca Tensile Notch Sensitivity of Additively Manufactured IN 625 Superalloy |
title | Tensile Notch Sensitivity of Additively Manufactured IN 625 Superalloy |
title_full | Tensile Notch Sensitivity of Additively Manufactured IN 625 Superalloy |
title_fullStr | Tensile Notch Sensitivity of Additively Manufactured IN 625 Superalloy |
title_full_unstemmed | Tensile Notch Sensitivity of Additively Manufactured IN 625 Superalloy |
title_short | Tensile Notch Sensitivity of Additively Manufactured IN 625 Superalloy |
title_sort | tensile notch sensitivity of additively manufactured in 625 superalloy |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7663153/ https://www.ncbi.nlm.nih.gov/pubmed/33138294 http://dx.doi.org/10.3390/ma13214859 |
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