| 高铌高磷GH4169C和GH4169合金的组织稳定性 |
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| 引用本文： | 倪童伟, 董建新, 张麦仓, 姚志浩. 高铌高磷GH4169C和GH4169合金的组织稳定性[J]. 工程科学学报, 2016, 38(9): 1278-1287. DOI: 10.13374/j.issn2095-9389.2016.09.012 |
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| 作者姓名： | 倪童伟 董建新 张麦仓 姚志浩 |
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| 作者单位： | 1.北京科技大学材料科学与工程学院, 北京 100083 |
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| 摘 要： | 为研究高铌高磷GH4169C高温合金在高温长期时效过程中的组织稳定性,通过场发射扫描电镜和数显布氏硬度计对GH4169和GH4169C两合金分别经600、650、704及720℃时效30~10000 h的显微组织和硬度变化进行对比分析。结果表明：在服役温度（650℃）范围内长期时效,GH4169合金和GH4169C合金均表现优异的稳定性；在服役温度以上长期时效,GH4169合金和GH4169C合金稳定性较差,短时间内,合金组织就出现失稳。对比而言,704℃时GH4169C合金组织稳定性较GH4169合金高,而720℃时GH4169C合金组织稳定性劣于GH4169合金。分析认为,GH4169C合金由于提高Nb含量和P含量使的γ＇相稳定性增加,得以在服役温度以上（704℃）表现比GH4169合金更为优异的组织稳定性,但Nb含量的提高也引起啄相含量的增加,导致组织稳定性下降。在超高温（720℃）下,GH4169C合金稳定性劣于GH4169合金。由此推知,相比GH4169合金,改型GH4169C合金在使用温度上有所提高,但提高有限,在超高温下,其稳定性反而降低。
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| 关 键 词： | 镍基高温合金 铌 磷 时效 微观组织 |
| 收稿时间： | 2015-11-09 |
Microstructure stability of GH4169 and GH4169C alloys with high content of phosphorus and niobium |
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| NI Tong-wei, DONG Jian-xin, ZHANG Mai-cang, YAO Zhi-hao. Microstructure stability of GH4169 and GH4169C alloys with high content of phosphorus and niobium[J]. Chinese Journal of Engineering, 2016, 38(9): 1278-1287. DOI: 10.13374/j.issn2095-9389.2016.09.012 |
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| Authors: | NI Tong-wei DONG Jian-xin ZHANG Mai-cang YAO Zhi-hao |
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| Affiliation: | 1.School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083 |
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| Abstract: | To study the microstructural stability of GH4169C alloy with high content of phosphorus and niobium, the microstruc-ture and hardness of GH4169C alloy and GH4169 alloy after long time aging were comparatively analyzed in this paper. These two su-peralloys were subjected to aging treatment at 600, 650, 704 and 720℃ for different times from 30 h to 10000 h. The microstructural evolution of the alloys was characterized by using a field emission scanning electron microscope and a Brinell hardness tester. The re-sults indicate that, at the service temperature of 650℃, GH4169 alloy and GH4169C alloy show excellent structure stability. Howev-er, above the service temperature, GH4169 alloy and GH4169C alloy have poor structure stability. In a short period of time, the two alloys lose stability. In contrast, the microstructure stability of GH4169C alloy is higher than that of GH4169 alloy with aging at 704℃, while GH4169C alloy shows a lower stability compared with GH4169 alloy at 720℃. It is thought that the stability of γ'phase in GH4169C alloy increases with increasing Nb and P contents. GH4169C alloy shows a better microstructure stability than GH4169 alloy at 704℃. However, the content of δphase will also increase with increasing Nb content, leading to the decrease in microstructure sta-bility of GH4169C alloy. At ultrahigh temperature (720℃), the microstructure stability of GH4169C alloy is inferior to GH4169 al-loy. This means that, compared with GH4169 alloy, the modified GH4169C alloy can be used in a higher temperature, whereas the temperature increase is limited, the microstructure stability of GH4169C alloy will decrease at ultrahigh temperature. |
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| Keywords: | nickel base superalloys niobium phosphorus aging microstructure |
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