Creep rupture of smoothed and notched DD6 single crystal superalloy specimens subjected to high-temperature hot corrosion

This work studies the creep rupture behaviors of both smoothed and V-notched DD6 Ni-based single crystal superalloy specimens under both air and corrosion conditions, within a stress range of 300 to 700 MPa at 950 °C. The corrosive medium used consisted of a mixed salt containing 95wt.% Na2SO4 and 5...

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Main Authors: Baishun Yang, Biao Li, Yaning Zhang
Format: Article
Language:English
Published: Elsevier 2025-01-01
Series:Materials & Design
Subjects:
Online Access:http://www.sciencedirect.com/science/article/pii/S0264127524009018
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author Baishun Yang
Biao Li
Yaning Zhang
author_facet Baishun Yang
Biao Li
Yaning Zhang
author_sort Baishun Yang
collection DOAJ
description This work studies the creep rupture behaviors of both smoothed and V-notched DD6 Ni-based single crystal superalloy specimens under both air and corrosion conditions, within a stress range of 300 to 700 MPa at 950 °C. The corrosive medium used consisted of a mixed salt containing 95wt.% Na2SO4 and 5wt.% NaCl. Experimental results revealed that notched specimens exhibited a creep rupture life extended by 6–16 times compared to smoothed specimens, with the extension becoming more pronounced as the stress concentration increased. High-temperature hot corrosion (HTHC) shortened the creep rupture time by up to 40 %. A significant HTHC-creep interactive effect was found through comparative creep experiments in air and corrosion conditions. The HTHC affected the fracture modes of the specimens, with factors such as the amount of salt infiltration into the superalloy, the corrosion duration, and specimen configurations playing critical roles. Microstructural analysis revealed that, compared with γ′ precipitates, γ matrix phase was more prone to creep damage and was more susceptible to corrosion.
format Article
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institution Kabale University
issn 0264-1275
language English
publishDate 2025-01-01
publisher Elsevier
record_format Article
series Materials & Design
spelling doaj-art-9b158dafb88045d9b7d286bc64878d512025-01-09T06:12:17ZengElsevierMaterials & Design0264-12752025-01-01249113526Creep rupture of smoothed and notched DD6 single crystal superalloy specimens subjected to high-temperature hot corrosionBaishun Yang0Biao Li1Yaning Zhang2School of Aeronautics, Northwestern Polytechnical University, Xi’an 710072, PR ChinaSchool of Aeronautics, Northwestern Polytechnical University, Xi’an 710072, PR China; National Key Laboratory of Strength and Structural Integrity, Xi’an 710072, PR China; Corresponding author.School of Aeronautics, Northwestern Polytechnical University, Xi’an 710072, PR ChinaThis work studies the creep rupture behaviors of both smoothed and V-notched DD6 Ni-based single crystal superalloy specimens under both air and corrosion conditions, within a stress range of 300 to 700 MPa at 950 °C. The corrosive medium used consisted of a mixed salt containing 95wt.% Na2SO4 and 5wt.% NaCl. Experimental results revealed that notched specimens exhibited a creep rupture life extended by 6–16 times compared to smoothed specimens, with the extension becoming more pronounced as the stress concentration increased. High-temperature hot corrosion (HTHC) shortened the creep rupture time by up to 40 %. A significant HTHC-creep interactive effect was found through comparative creep experiments in air and corrosion conditions. The HTHC affected the fracture modes of the specimens, with factors such as the amount of salt infiltration into the superalloy, the corrosion duration, and specimen configurations playing critical roles. Microstructural analysis revealed that, compared with γ′ precipitates, γ matrix phase was more prone to creep damage and was more susceptible to corrosion.http://www.sciencedirect.com/science/article/pii/S0264127524009018DD6 Ni-based single crystal superalloyHigh temperature-hot corrosionCreep ruptureRaftingSmoothed and notched specimens
spellingShingle Baishun Yang
Biao Li
Yaning Zhang
Creep rupture of smoothed and notched DD6 single crystal superalloy specimens subjected to high-temperature hot corrosion
Materials & Design
DD6 Ni-based single crystal superalloy
High temperature-hot corrosion
Creep rupture
Rafting
Smoothed and notched specimens
title Creep rupture of smoothed and notched DD6 single crystal superalloy specimens subjected to high-temperature hot corrosion
title_full Creep rupture of smoothed and notched DD6 single crystal superalloy specimens subjected to high-temperature hot corrosion
title_fullStr Creep rupture of smoothed and notched DD6 single crystal superalloy specimens subjected to high-temperature hot corrosion
title_full_unstemmed Creep rupture of smoothed and notched DD6 single crystal superalloy specimens subjected to high-temperature hot corrosion
title_short Creep rupture of smoothed and notched DD6 single crystal superalloy specimens subjected to high-temperature hot corrosion
title_sort creep rupture of smoothed and notched dd6 single crystal superalloy specimens subjected to high temperature hot corrosion
topic DD6 Ni-based single crystal superalloy
High temperature-hot corrosion
Creep rupture
Rafting
Smoothed and notched specimens
url http://www.sciencedirect.com/science/article/pii/S0264127524009018
work_keys_str_mv AT baishunyang creepruptureofsmoothedandnotcheddd6singlecrystalsuperalloyspecimenssubjectedtohightemperaturehotcorrosion
AT biaoli creepruptureofsmoothedandnotcheddd6singlecrystalsuperalloyspecimenssubjectedtohightemperaturehotcorrosion
AT yaningzhang creepruptureofsmoothedandnotcheddd6singlecrystalsuperalloyspecimenssubjectedtohightemperaturehotcorrosion