Protective Alumina Scale Growth at 900 °C for a Ni- and Cr-Free Co-Base Model Alloy with γ/γ’-Microstructure: Synergistic Effects by Combining Shot-Peening and Halogenation
| العنوان: | Protective Alumina Scale Growth at 900 °C for a Ni- and Cr-Free Co-Base Model Alloy with γ/γ’-Microstructure: Synergistic Effects by Combining Shot-Peening and Halogenation |
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| المؤلفون: | Dorota Kubacka, Erdmann Spiecker, K. Beck, Sannakaisa Virtanen, H.-E. Zschau, S. P. Hagen, Mathias C. Galetz |
| المصدر: | Oxidation of Metals. 97:209-226 |
| بيانات النشر: | Springer Science and Business Media LLC, 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Materials science, Alloy, Metals and Alloys, Halogenation, engineering.material, Microstructure, Shot peening, Isothermal process, Inorganic Chemistry, Superalloy, Chemical engineering, Materials Chemistry, engineering, Gravimetric analysis, Surface modification |
| الوصف: | The oxidation resistance of novelγ/γ’-strengthened Co-base superalloys is clearly outmatched by their Ni-base counterparts within the high-temperature regime. Therefore, surface modification strategies to foster protective alumina growth seem auspicious. This study elucidates the impact of fluorination and shot-peening on protective alumina formation at 900 °C for a quaternary Co-base model alloy (Co-Al-W-Ta system) which is well known for an exceptionally low inherent oxidation resistance. Time-resolved isothermal gravimetric analysis (TGA) in synthetic air, detailed electron microscopic analysis, and X-ray diffraction (XRD) were used. For polished samples, no pronounced enhancement of oxidation resistance could be obtained by halogenation. However, in case of shot-peened samples (halogen-free), an increased tendency for alumina formation is found compared to polished surfaces. The very early stages of oxidation were identified to be especially crucial with respect to sustainable protective scale growth. Most noteworthy is the observation of a strong synergistic effect derived by a combination of halogenation and shot-peening, leading to significantly increased oxidation resistance. |
| تدمد: | 1573-4889 0030-770X |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::50c6f974ea256791a1d6a628f10f70ae https://doi.org/10.1007/s11085-021-10087-y |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi...........50c6f974ea256791a1d6a628f10f70ae |
| قاعدة البيانات: | OpenAIRE |
Find this article in full text from Springer Verlag. | تدمد: | 15734889 0030770X |
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