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| Experimental Investigation on Eutectic Fraction in Single Crystal Castings of Superalloy CMSX– 4 and DD419 |
| ZHAO Yunxing 1, 2 , YUAN Yingying 2 , MA Dexin 1, 2 , XU Weitai 2 , XU Fuze 2 , WEI Bing 2 |
1. Powder Metallurgy Research Institute, Central South University, Changsha 410083, China;
2. Wedge Central South Research Institute Co., Ltd., Shenzhen 518045, China |
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Abstract Using two types of the second generation superalloys CMSX– 4 and DD419, the single crystal blades and plates with the same shape were produced under the same process conditions. The as-cast and solution heat treated microstructures of the blade castings were detected and analyzed. It was found that the γ/γ ′ eutectic fraction in as-cast structure of CMSX– 4 alloy is about 39% higher than that in alloy DD419, in spite of the similar chemical compositions of the both alloys. After solution heat treatment, the residual eutectic in CMSX– 4 alloy was observed to be higher than that of DD419 alloy, revealing more risk to exceed the technical standard. Besides the significant higher eutectic fraction, CMSX–4 exhibits also more non-uniform distribution of eutectic in different blade positions, so that the mechanical properties of the CMSX–4 castings is further negatively influenced.
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2022, 
