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Improved spallation resistance of the Oxide Scale by Hf/Y Co-doping in Ni-Based Superalloy at High Temperature

Acta Metallurgica Sinica(English Letters) 2022年第10期35卷 1744-1758页

作者： Khalil Rehman Naicheng Sheng Shigang Fan Shijie Sun Guicheng Hou Yizhou Zhou Xiaofeng Sun Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Material Science and Engineering University of Science and Technology of ChinaHefei230026China

Ni-based superalloys added with comparably higher concentrations of single-doped Hf and co-doped Hf/Y are prepared by vacuum induction melting(VIM).The oxidation properties up to 300 h at 900℃,1000℃,and 1100℃ are *** undoped alloy exhibited a minimum oxidation rate at 900℃ and 1000℃.The co-doped alloy showed a higher oxidation rate;however,it possesses better scale adhesion,and no spallation ***-doped alloy showed a lower oxidation rate and better scale adhesion at 900℃ and 1000℃,but exhibited a shorter lifetime at 1100℃.The spallation of the Hf-doped alloy is attributed to the precipitation of the HfO2 in and beneath the oxide *** spallation in the undoped alloy is accredited to the thermal expansion mismatch between the growing oxide scale and superalloy *** two reactive elements(REs)in alloy minimized the precipitation of RE oxide in the oxide scale,diminished internal oxidation in the alloy,and decreased oxide scale spallation.

关键词： Superalloys Reactive elements Oxidation kinetics Microstructure spallation resistance

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Preparation of Al_2O_3/Au nano-laminated composite coatings and their oxidation resistance on stainless steel

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Transactions of Nonferrous Metals Society of China 2012年第10期22卷 2491-2497页

作者：高俊国陆峰汤智慧王长亮何业东北京航空材料研究院金属腐蚀与防护研究室北京100095 北京科技大学北京市腐蚀磨蚀与表面技术重点实验室北京100083

Al2O3/Au nano-laminated composite coatings were prepared by means of magnetron sputtering. The coating was compact and comprised of nano-laminated Al2O3 and Au layers. High temperature cyclic oxidation test was employed to investigate the oxidation resistance of the composite coatings. The results revealed that the applied Al2O3/Au nano-laminated composite coatings improved the oxidation and spallation resistance of the stainless steel substrate significantly. The mechanism accounting for oxidation resistance was related with the suppression of inward oxygen diffusion and selective oxidation of Cr in the substrate. The mechanism accounting for spallation resistance was attributed to the relaxation of thermal stress by the nano-laminated structure.

关键词： Al2O3/Au composite coatings magnetron sputtering oxidation resistance spallation resistance

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Effect of Co on oxidation and hot corrosion behavior of two nickel-based superalloys under Na_(2)SO_(4)-NaCl at 900℃

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Transactions of Nonferrous Metals Society of China 2021年第8期31卷 2402-2414页

作者： Jun-sheng MENG Ming-xuan CHEN Xiao-ping SHI Qiang MA Naval Architecture and Port Engineering College Shandong Jiaotong UniversityWeihai 264200China

Nickel-based superalloys with and without Co by partial replacement of W were prepared using double vacuum melting.A comparison of the oxidation in air and hot corrosion behaviors under molten 75 wt.%Na2 SO4+25 wt.%NaCl at 900℃were systematically *** results showed that partial replacement of W with Co promoted the formation of chromia scale and consequently decreased the oxidation ***,the addition of Co also retarded the internal oxidation/nitridation of Al and consequently promoted the growth of Al_(2) O3 scale,which further decreased the scaling rate and improved the adhesion of ***,the addition of Co also further improved the hot corrosion resistance under molten Na2 SO4-NaCl salts.

关键词： nickel based superalloys oxidation hot corrosion spallation resistance

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