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| Influence Rule of Aluminizing Temperature/Time on Formation of Infiltrated Layer of Ni-superalloy |
| Received:November 01, 2018 Revised:January 25, 2019 |
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| DOI：10.7643/ issn.1672-9242.2019.01.003 |
| KeyWord:gas-phase aluminizing aluminide coating SEM EDS |
| Author | Institution |
| MENG Cai-si |
AECC Guiyang Precision Casting Company, Guiyang , China |
| HUO Ke-li |
AECC Guiyang Precision Casting Company, Guiyang , China |
| CHEN Zhong |
AECC Guiyang Precision Casting Company, Guiyang , China |
| ZHANG Yao |
AECC Guiyang Precision Casting Company, Guiyang , China |
| HAO Fen-li |
AECC Guiyang Precision Casting Company, Guiyang , China |
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| Abstract: |
| Objective To improve high temperature oxidation resistance of materials. Methods The aluminide coating was prepared on the surface of K417 Ni-superalloy by gas-phase aluminizing. The thickness, microstructure and distribution of ele-ments in the coating were analyzed by optical microscope, scanning electron microscope (SEM) and energy dispersive spec-troscopy (EDS). And the influences of temperature and time on the coatings forming rules were analyzed. Results The micro-structure of the aluminized layer prepared by vapor-phase aluminizing method was a typical external diffusion structure. The outer layer was a single β-NiAl phase, and the inner layer was a diffusion layer containing Cr-rich precipitates. The fine precipitation of diffusion layer acted as a hindrance to the diffusion of Al element. Conclusion With the increase of aluminizing temperature and time, the thickness of aluminizing layer increases gradually, and the effect of aluminizing temperature on the thickness of aluminizing layer is much higher than that of aluminizing time on the depth of aluminizing layer. The critical value for aluminizing temperature is 980 ℃. The thickness increase was not significant under 980 ℃and the sensitivity of thickness to the aluminizing temperature and time increases when the temperature was higher than 980 ℃. In addition, the higher the aluminizing temperature, the greater the tendency to form pores in the aluminized layer. |
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