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Evolution of microstructures and properties of the GH4169 superalloy during short-term and high-temperature processing

机译：短期和高温加工过程中GH4169高温合金的组织和性能演变

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摘要

The effects of short-term (less than 1 h) and high-temperature processing (850-1050 degrees C) in the temperature range between the commonly used aging temperature and solution temperature on the microstructure, mechanical properties, and corrosion resistance of the GH4169 superalloy is investigated systematically. With increasing temperature and time, strengthening precipitates such as the gamma' and gamma '' phases in the grains and carbides in the grain boundaries dissolve in the matrix gradually consequently decreasing the tensile strength and yield strength and increasing the ductility. Evolution of the precipitates with temperature is consistent with thermodynamic calculation and grain growth is associated with evolution of the precipitates during the short-term and high-temperature processes. The grains grow slowly and the activation energy is less than 45.4 KJ/mol when the temperature is below 1000 degrees C. However, as the temperature is increased from 1000 degrees C to 1050 degrees C, the grains grow rapidly and the activation energy is about 398.5 KJ/mol. The GH4169 superalloy treated at 900 degrees C for 10 min possesses superior mechanical properties including high strength and ductility. Electrochemical tests indicate that the corrosion resistance is improved by increasing the temperature. After the treatment at 1050 degrees C for 60 min, the self-corrosion potential E-corr and corrosion current density I-corr are -705.9 mV and 2.96 mu A cm(-2), respectively, reflecting an increase of 177 mV and decrease of 22 mu A cm(-2) compared to the untreated sample. There is evidence that the content in the precipitates plays a crucial role in the corrosion behavior of the superalloy and our results reveal many potential engineering applications for the GH4169 superalloy.
机译：在常用时效温度和固溶温度之间的温度范围内进行短期（不到1小时）和高温处理（850-1050摄氏度）对GH4169的组织，力学性能和耐腐蚀性的影响对高温合金进行了系统的研究。随着温度和时间的增加，增强的析出物（例如晶粒中的γ'相和γ'相）以及晶界中的碳化物逐渐溶解在基体中，从而逐渐降低了抗拉强度和屈服强度并提高了延展性。沉淀物随温度的演变与热力学计算一致，晶粒的长大与短期和高温过程中沉淀物的演变有关。当温度低于1000摄氏度时，晶粒生长缓慢，活化能小于45.4 KJ / mol。但是，当温度从1000摄氏度升高至1050摄氏度时，晶粒迅速生长，活化能约为398.5 KJ /摩尔。在900摄氏度下处理10分钟的GH4169高温合金具有卓越的机械性能，包括高强度和延展性。电化学测试表明，通过提高温度可以改善耐腐蚀性。在1050摄氏度下处理60分钟后，自腐蚀电位E-corr和腐蚀电流密度I-corr分别为-705.9 mV和2.96μA cm（-2），反映出增加了177 mV而减少了与未处理的样品相比，其面积为22μA cm（-2）。有证据表明，析出物中的含量在高温合金的腐蚀行为中起着至关重要的作用，我们的结果揭示了GH4169高温合金的许多潜在工程应用。

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  • 来源
    《Materials Science and Engineering》 |2019年第28期|255-266|共12页
  • 作者

    An X. L.; Zhang B.; Chu C. L.; Zhou L.; Chu Paul K.;

  • 作者单位

    Southeast Univ, Sch Mat Sci & Engn, Nanjing 211189, Jiangsu, Peoples R China|Southeast Univ, Jiangsu Key Lab Adv Metall Mat, Nanjing 211189, Jiangsu, Peoples R China;

    Southeast Univ, Sch Mat Sci & Engn, Nanjing 211189, Jiangsu, Peoples R China|Southeast Univ, Jiangsu Key Lab Adv Metall Mat, Nanjing 211189, Jiangsu, Peoples R China;

    Southeast Univ, Sch Mat Sci & Engn, Nanjing 211189, Jiangsu, Peoples R China|Southeast Univ, Jiangsu Key Lab Adv Metall Mat, Nanjing 211189, Jiangsu, Peoples R China;

    Jiangsu Sunray Technol CO LTD, Nanjing 211189, Jiangsu, Peoples R China;

    City Univ Hong Kong, Dept Phys, Kowloon, Tat Chee Ave, Hong Kong, Peoples R China|City Univ Hong Kong, Dept Mat Sci & Engn, Kowloon, Tat Chee Ave, Hong Kong, Peoples R China;

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  • 关键词

    GH4169 superalloy; Short-term high-temperature processing; Microstructure; Mechanical properties; Corrosion resistance;

    机译：GH4169高温合金;短期高温加工;组织;力学性能;耐蚀性;

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