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Effect of Rhenium Addition on Isothermal Oxidation Behavior of a Nickel-base Single Crystal Superalloy |
Jianxiu CHANG1, Dong WANG2( ), Jiasheng DONG2, Di WANG2, Hanchang WU3, Gong ZHANG2, Langhong LOU2 |
1 College of Materials Science and Engineering, Xi?an Shiyou University, Xi?an 710065, China 2 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China 3 Guiyang AECC Power Investment Casting Ltd. Co., Guiyang 550014, China |
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Cite this article:
Jianxiu CHANG, Dong WANG, Jiasheng DONG, Di WANG, Hanchang WU, Gong ZHANG, Langhong LOU. Effect of Rhenium Addition on Isothermal Oxidation Behavior of a Nickel-base Single Crystal Superalloy. Chinese Journal of Materials Research, 2017, 31(9): 695-702.
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Abstract Effect of rhenium (Re) addition on isothermal oxidation behavior of a nickel-base single crystal superalloy was investigated by means of intermittent measurement of weight change as well as scanning electron microscope (SEM) and X-ray diffractometer (XRD). It was shown that, a scale composed of a (Cr, Ti)-enriched outer oxide layer, an inner Al2O3 layer and an inner TiN layer was formed for both the Re-containing and Re-free alloys, however, the Al2O3 layer was much more complete and the amount of TiN was much less on the Re-containing alloy rather than those on the Re-free alloy. Re was found to lower the oxidation rate of the alloy and improve the stability of the entire oxide scale during long-term oxidation by increasing the activity of Cr and thus increasing the content of Cr2O3 in the scale. Enhancement of Cr2O3 formation may then accelerate the selective oxidation of Al and thus promote the formation of a continuous Al2O3 layer beneath the outer oxide scale, as a result, which inhibited the formation of the inner nitride.
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Received: 30 September 2016
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Fund: Supported by National Natural Science Foundation of China (No.51631008) and National Key Research and Development Program of China (No.2016YFB0701403) |
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