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Acta Metall Sin  2015, Vol. 51 Issue (7): 853-858    DOI: 10.11900/0412.1961.2015.00007
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EFFECT OF C ON THE INTERFACIAL REACTION AND WETTABILITY BETWEEN A Ni-BASED SUPERALLOY AND CERAMIC MOULD
Xiaoyan CHEN1,Zhe JIN2,Xuefeng BAI2,Yizhou ZHOU1(),Tao JIN1,Xiaofeng SUN1
1 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
2 Shenyang Liming Aero-Engine Group Corporation, Shenyang 110043
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Xiaoyan CHEN,Zhe JIN,Xuefeng BAI,Yizhou ZHOU,Tao JIN,Xiaofeng SUN. EFFECT OF C ON THE INTERFACIAL REACTION AND WETTABILITY BETWEEN A Ni-BASED SUPERALLOY AND CERAMIC MOULD. Acta Metall Sin, 2015, 51(7): 853-858.

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Abstract  

Superalloy components are always produced by the way of investment casing. During investment casting, interfacial reactions may take place and bring about metal contamination and defect formation on the surface of the components. The influence of C content on the interfacial reaction and wettability between a Ni-based superalloy and ceramic mould was investigated by using a sessile drop method. The interfacial morphology and elements distribution were studied by SEM and EPMA. Activities of C, Cr and Al were calculated by using Thermo-Calc software. The relationship between interfacial reaction and wettability was discussed. It was found that when C content was higher than 0.1%, activity of C increased greatly and interfacial reaction took place. The wettability varied from non-reactive wetting to reactive wetting. In the reactive wetting systems, sand adhesions appeared and Al and Cr diffused to the ceramic surface.
Key words:  superalloy      ceramic mould      interfacial reaction      wettability      activity      C     
Fund: Supported by National Natural Science Foundation of China (Nos.51271186, 51331005 and 11332010) and High Technology Research and Development Program of China (No.2014AA041701)
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Xiaoyan CHEN
Zhe JIN
Xuefeng BAI
Yizhou ZHOU
Tao JIN
Xiaofeng SUN

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https://www.ams.org.cn/EN/10.11900/0412.1961.2015.00007     OR     https://www.ams.org.cn/EN/Y2015/V51/I7/853

Fig.1  Schematic of high temperature furnace for the wetting experiment
Fig.2  Variation in the wetting angle with time (t) for the alloy melt/ceramic couples
Fig.3  Macrographs of the alloys and the ceramics after wetting experiments (The numbers 0.008~0.3 are the mass fraction of C in the alloy)
Fig.4  Microstructures around the alloy melt (0.2%C)/ceramic interaction area (a), detailed microstructure for areas I (b) and II (c) in Fig.4a, EPMA elemental distributions around the alloy melt (0.2%C)/ceramic interaction area (d1~d4)
Fig.5  Interface microstructures of the non-reactive wetting system (0.05%C) (a), reactive wetting system (0.2%C) (b) and EMPA elemental distributions of the interfacial zone for the reactive wetting system (c1~c4)
Alloy aC / 10-4 aAl / 10-7 aCr / 10-4
A1 2.01 3.52 1.50
A2 2.51 3.52 1.50
A3 12.77 3.57 1.47
A4 26.05 3.63 1.45
A5 53.54 3.79 1.38
A6 81.78 3.86 1.35
Table1  Activities of C (aC), Al (aAl) and Cr (aCr) for alloys A1~A6 at 1550 ℃
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