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http://hdl.handle.net/10397/106451
Title: | Effect of Mo:W ratio on segregation behavior and creep strength of nickel-based single crystal superalloys | Authors: | Zhang, L Huang, Z Jiang, L Luan, J Jiao, Z Liu, CT |
Issue Date: | 28-Jan-2019 | Source: | Materials science and engineering. A, Structural materials : properties, microstructure and processing, 28 Jan. 2019, v. 744, p. 481-489 | Abstract: | In past decades, molybdenum (Mo) has demonstrated the potential to replace tungsten (W) in designing lighter nickel-based single crystal superalloys with enhanced creep resistance. In this research, three groups of nickel-based single crystal superalloys are designed and prepared by tuning the Mo:W ratio. The experimental observations show that the primary and secondary dendrite arm spacings are both independent on Mo:W ratio, but the γ/γ′ eutectic volume fraction decreases as Mo:W ratio increases. The electron probe microanalysis reveals that Re, W and Co segregate to dendrite core regions, while Al, Ti, Cr, Mo and Ta to interdendritic regions. The microsegregation of Ta, W and Re are gradually relieved with increasing Mo:W ratio. Atom probe tomography results further indicate that Cr and Mo are depleted in γ/γ′ eutectics, leading to the enrichment of Cr and Mo at interdendritic regions away from γ/γ′ eutectics. Creep rupture results show that the rupture life at 1040 °C/145 MPa is improved as Mo:W ratio increases. | Keywords: | Alloy design Creep rupture Microsegregation Mo:W ratio Nickel-based single crystal superalloys γ/γ′ eutectic |
Publisher: | Elsevier BV | Journal: | Materials science and engineering. A, Structural materials : properties, microstructure and processing | ISSN: | 0921-5093 | EISSN: | 1873-4936 | DOI: | 10.1016/j.msea.2018.12.043 | Rights: | © 2018 Elsevier B.V. All rights reserved. © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/. The following publication Zhang, L., Huang, Z., Jiang, L., Luan, J., Jiao, Z., & Liu, C. T. (2019). Effect of Mo:W ratio on segregation behavior and creep strength of nickel-based single crystal superalloys. Materials Science and Engineering: A, 744, 481-489 is available at https://doi.org/10.1016/j.msea.2018.12.043. |
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Jiao_Effect_Mow_Ratio.pdf | Pre-Published version | 1.9 MB | Adobe PDF | View/Open |
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