ORCID Profile
0000-0002-2199-1937
Current Organisation
Northeastern University at Qinhuangdao
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Publisher: Elsevier BV
Date: 2017
Publisher: Elsevier BV
Date: 03-2019
Publisher: Springer Science and Business Media LLC
Date: 08-03-2019
Publisher: Elsevier BV
Date: 2022
Publisher: Springer Science and Business Media LLC
Date: 26-06-2018
DOI: 10.1557/JMR.2018.190
Publisher: Wiley
Date: 02-11-2021
Abstract: Co‐based superalloys with the advantages of high melting point, high‐temperature mechanical properties, and large resistance under hot corrosion environment are potential candidates for turbine engine components. The isothermal oxidation behavior of Co–Ni–Al‐based superalloy with the addition of Mo and Cr in dry air at 1073 and 1173 K was investigated. The results showed that similar three‐layer oxides structures were composed of Co‐containing oxides, complex oxides rich in Co and Al, and Al 2 O 3 layer formed on both 2Mo and 2Cr Co–Ni–Al‐based superalloys, and Mo‐containing oxides also existed in the subsurface. The oxides in the outer layer transferred from Co 3 O 4 to denser CoO with the increase in temperature. The γ'‐free zone formed under the Al 2 O 3 layer due to the depletion of Al. Co–Ni–Al‐based superalloys need to conquer a large energy barrier at an earlier stage of oxidation and exhibit good oxidation resistance at 1073 K.
Publisher: Springer Science and Business Media LLC
Date: 19-07-2017
DOI: 10.1038/S41598-017-06191-2
Abstract: The precipitates obtained by EPE technology from the 9Cr-1.7W-0.4Mo-Co ferritic heat-resistant steel subject to isothermal aging were investigated using SEM, TEM and XRD. The particle size distribution and the coarsening kinetics of M 23 C 6 with duration of isothermal aging were also analyzed with or without consideration of Laves phase. The results show that the isolated dislocations were detected in delta ferrite interior, and the precipitates on delta ferrite and martensite boundaries are obviously larger than other locations. Fe 2 W-Laves phase can only be found as duration of aging time to 2000 h, and is preferential to form adjacent to M 23 C 6 particles. The small M 23 C 6 particles firstly coarsen, but the large M 23 C 6 are relatively stable during short aging. The total coarsening rate of M 23 C 6 precipitates is 9.75 × 10 −28 m 3 s −1 , and the coarsening of M 23 C 6 depends on the formation of Laves phase.
No related grants have been discovered for Qiuzhi Gao.