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Effects of the γ″-Ni(3)Nb Phase on Mechanical Properties of Inconel 718 Superalloys with Different Heat Treatments

The effects of the γ″-Ni(3)Nb phase on the mechanical properties of Inconel 718 superalloys, with standard heat treatment, hot isostatic pressing + solution treatment + aging, and hot isostatic pressing + direct aging, were characterized by morphological observation, X-ray diffraction, and tensile e...

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Autores principales: Ling, Li-Shi-Bao, Yin, Zheng, Hu, Zhi, Liang, Jin-Hui, Wang, Zhi-Yong, Wang, Jun, Sun, Bao-De
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6981741/
https://www.ncbi.nlm.nih.gov/pubmed/31906136
http://dx.doi.org/10.3390/ma13010151
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author Ling, Li-Shi-Bao
Yin, Zheng
Hu, Zhi
Liang, Jin-Hui
Wang, Zhi-Yong
Wang, Jun
Sun, Bao-De
author_facet Ling, Li-Shi-Bao
Yin, Zheng
Hu, Zhi
Liang, Jin-Hui
Wang, Zhi-Yong
Wang, Jun
Sun, Bao-De
author_sort Ling, Li-Shi-Bao
collection PubMed
description The effects of the γ″-Ni(3)Nb phase on the mechanical properties of Inconel 718 superalloys, with standard heat treatment, hot isostatic pressing + solution treatment + aging, and hot isostatic pressing + direct aging, were characterized by morphological observation, X-ray diffraction, and tensile experiments. The results of the morphological observation revealed that many fine γ″ precipitates of ~26.49 ± 1.82 nm in mean size were formed in all samples. However, the relatively coarser γ″ precipitates formed in the grain boundaries were only observed in the sample treated with hot isostatic pressing + direct aging. The yield strengths of the hot isostatic pressing + direct aging sample at room temperature and at 650 °C both exhibited the maximum values about 993 ± 5.7 and 811 ± 12.6 MPa, respectively. The γ″ precipitate was considered to be the dominant strengthening phase in the sample according to the lattice misfits (ε) of γ/γ″. The strengthening mechanism of the samples can be explained as the coherency strain strengthening of fine γ″ precipitates. Moreover, due to the coarser γ″ precipitates in the grain boundaries, dislocation-cut ordered particle strengthening also occurred in the sample after hot isostatic pressing + direct aging treatment.
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spelling pubmed-69817412020-02-07 Effects of the γ″-Ni(3)Nb Phase on Mechanical Properties of Inconel 718 Superalloys with Different Heat Treatments Ling, Li-Shi-Bao Yin, Zheng Hu, Zhi Liang, Jin-Hui Wang, Zhi-Yong Wang, Jun Sun, Bao-De Materials (Basel) Article The effects of the γ″-Ni(3)Nb phase on the mechanical properties of Inconel 718 superalloys, with standard heat treatment, hot isostatic pressing + solution treatment + aging, and hot isostatic pressing + direct aging, were characterized by morphological observation, X-ray diffraction, and tensile experiments. The results of the morphological observation revealed that many fine γ″ precipitates of ~26.49 ± 1.82 nm in mean size were formed in all samples. However, the relatively coarser γ″ precipitates formed in the grain boundaries were only observed in the sample treated with hot isostatic pressing + direct aging. The yield strengths of the hot isostatic pressing + direct aging sample at room temperature and at 650 °C both exhibited the maximum values about 993 ± 5.7 and 811 ± 12.6 MPa, respectively. The γ″ precipitate was considered to be the dominant strengthening phase in the sample according to the lattice misfits (ε) of γ/γ″. The strengthening mechanism of the samples can be explained as the coherency strain strengthening of fine γ″ precipitates. Moreover, due to the coarser γ″ precipitates in the grain boundaries, dislocation-cut ordered particle strengthening also occurred in the sample after hot isostatic pressing + direct aging treatment. MDPI 2019-12-31 /pmc/articles/PMC6981741/ /pubmed/31906136 http://dx.doi.org/10.3390/ma13010151 Text en © 2019 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
Ling, Li-Shi-Bao
Yin, Zheng
Hu, Zhi
Liang, Jin-Hui
Wang, Zhi-Yong
Wang, Jun
Sun, Bao-De
Effects of the γ″-Ni(3)Nb Phase on Mechanical Properties of Inconel 718 Superalloys with Different Heat Treatments
title Effects of the γ″-Ni(3)Nb Phase on Mechanical Properties of Inconel 718 Superalloys with Different Heat Treatments
title_full Effects of the γ″-Ni(3)Nb Phase on Mechanical Properties of Inconel 718 Superalloys with Different Heat Treatments
title_fullStr Effects of the γ″-Ni(3)Nb Phase on Mechanical Properties of Inconel 718 Superalloys with Different Heat Treatments
title_full_unstemmed Effects of the γ″-Ni(3)Nb Phase on Mechanical Properties of Inconel 718 Superalloys with Different Heat Treatments
title_short Effects of the γ″-Ni(3)Nb Phase on Mechanical Properties of Inconel 718 Superalloys with Different Heat Treatments
title_sort effects of the γ″-ni(3)nb phase on mechanical properties of inconel 718 superalloys with different heat treatments
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6981741/
https://www.ncbi.nlm.nih.gov/pubmed/31906136
http://dx.doi.org/10.3390/ma13010151
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