Oxidation Behavior of K4750 Alloy at Temperatures Between 750 degrees C and 1000 degrees C
Liu, Yan-Li1,2; Hou, Kun-Lei1,2; Ou, Mei-Qiong2; Ma, Ying-Che2; Liu, Kui2
Corresponding AuthorOu, Mei-Qiong( ; Ma, Ying-Che(
AbstractThis study investigated the oxidation behavior of a new casting Ni-based superalloy K4750 at 750 degrees C-1000 degrees C in air for 100 h-1000 h by isothermal oxidation tests. The oxidation-kinetic curves were plotted by the static discontinuous weight gain method. Observation and identification of oxidation products were conducted using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), electron probe micro-analysis (EPMA) and X-ray diffraction (XRD). X-ray photoelectron spectrometer (XPS) was also used to analyze the chemical state of elements and the distribution in depth. The results showed that the oxidation-kinetic curves of K4750 alloy basically obeyed the parabolic law. The average oxidation rate below 900 degrees C was less than 0.1 g/m(2)center dot h which meant the alloy was at a complete anti-oxidation grade, and the alloy was at an anti-oxidation grade at 1000 degrees C. The predominant surface oxide was Cr2O3, and a double layer structure of the oxide scale was observed at all tested temperatures as time increased. The outer oxide layer contained continuous Cr2O3 and a small amount of oxides mixed TiO2 and NiCr2O4, while the inner oxide layer was composed with Al2O3. The oxidation process could be interpreted by the competitive oxidation of different elements. The diffusion rate of Ti through Cr2O3 layer increased with increasing temperature, and thus the generation of TiO2 was advantageous. The dispersed TiO2 reaching a certain amount destroyed the continuity of the surface oxide layer, which accounted for the reduction of oxidation resistance of K4750 alloy at high temperatures.
KeywordNi-based superalloy Oxidation Titanium Internal oxides
Indexed BySCI
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000651688600002
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorOu, Mei-Qiong; Ma, Ying-Che
Affiliation1.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China
2.Chinese Acad Sci, Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Liu, Yan-Li,Hou, Kun-Lei,Ou, Mei-Qiong,et al. Oxidation Behavior of K4750 Alloy at Temperatures Between 750 degrees C and 1000 degrees C[J]. ACTA METALLURGICA SINICA-ENGLISH LETTERS,2021:12.
APA Liu, Yan-Li,Hou, Kun-Lei,Ou, Mei-Qiong,Ma, Ying-Che,&Liu, Kui.(2021).Oxidation Behavior of K4750 Alloy at Temperatures Between 750 degrees C and 1000 degrees C.ACTA METALLURGICA SINICA-ENGLISH LETTERS,12.
MLA Liu, Yan-Li,et al."Oxidation Behavior of K4750 Alloy at Temperatures Between 750 degrees C and 1000 degrees C".ACTA METALLURGICA SINICA-ENGLISH LETTERS (2021):12.
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