镍基粉末高温合金René88DT在650℃和750℃间的熔盐腐蚀行为

郑磊; 张麦仓; 董建新

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Hot corrosion performances of powder metallurgy René88DT nickel-based superalloy in molten salts environment between 650 C and 750 C

首发时间：2010-12-27

ZHENG Lei ¹
ZHENG Lei (Birth 1977-), Male, Lecturere, Main researches are grain boundary segregation and microstructure evolutions of superalloys
ZHANG Maicang ¹ DONG Jianxin ¹

1、School of Materials Science and Engineering, University of Science and Technology Beijing

Abstract：Hot corrosion performances of powder metallurgy (PM) René88DT Ni-based superalloy in molten 25%NaCl+75%Na2SO4 salts at 650℃, 700℃ and 750℃ were investigated by weight loss measurements, X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDS). Experimental results showed that PM René88DT superalloy follows a parabolic law of corrosion kinetics at 650℃, but first parabolic and then linear ones at 700℃ and 750 ℃. The changes of kinetics at 700℃ and 750℃ were concluded to be caused by severe spalling of corrosion layers. Corrosion layers on the surface of PM René88DT superalloy were detected to be composed of Cr2O3, NiO, and Ni3S2 at each temperature. Cross-sectional morphologies and corresponding elemental maps indicated that corrosion layers are composed of oxides and sulfides at all temperatures. According to these results, a cooperating mechanism of oxidation and sulfuration for hot corrosion of PM René88DT Ni-based superalloy was confirmed.

keywords： High-temperature alloy Powder metallurgy Corrosion

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镍基粉末高温合金René88DT在650℃和750℃间的熔盐腐蚀行为

郑磊 ¹
ZHENG Lei (Birth 1977-), Male, Lecturere, Main researches are grain boundary segregation and microstructure evolutions of superalloys
张麦仓 ¹ 董建新 ¹

1、北京科技大学材料学院

摘要：借助于失重测量、X射线衍射、扫描电镜以及X射线能谱仪，研究了镍基粉末高温合金René88DT在25%NaCl+75%Na2SO4熔盐下的热腐蚀行为。结果表明：René88DT合金在650℃下的腐蚀动力学符合抛物线规律，而在700℃和750℃下则首先为抛物线而后为直线规律。动力学规律的改变被认为是由于腐蚀层的剥落引起的。各温度下的腐蚀层由Cr2O3、NiO、Ni3S2组成。横截面形貌以及相应的元素面分布表明在各温度下腐蚀层都由氧化物和硫化物组成。基于实验结果，确认René88DT合金的热腐蚀行为符合氧化-硫化机理。

关键词：高温合金粉末冶金腐蚀

基金：

1. National Natural Science Foundation of China （No. 50771011 and No. 51001011), the Research Fund for the Doctoral Program of Higher Education of China）

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ZHENG Lei,ZHANG Maicang,DONG Jianxin. Hot corrosion performances of powder metallurgy René88DT nickel-based superalloy in molten salts environment between 650 C and 750 C[EB/OL]. Beijing:Sciencepaper Online[2010-12-27]. https://www.paper.edu.cn/releasepaper/content/201012-1158.

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论文编号	201012-1158
论文题目	镍基粉末高温合金René88DT在650℃和750℃间的熔盐腐蚀行为
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