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中文摘要：
研究了碳（C）对第一代镍基单晶高温合金AM3显微组织的影响。结果表明,随着碳含量的增加,枝晶形貌和间距无明显变化,合金中共晶的数量明显减少,一次碳化物逐渐增多。该合金中一次碳化物形貌通常为块状、骨架状和汉字状。当含碳量较高时,碳化物形貌为由骨架状连接形成的网状碳化物（汉字状碳化物）。
英文摘要：
The effect of carbon addition on the solidification microstructure of the first generation single crystal Ni-based superalloy AM3 was studied.The results indicate that with increasing of carbon content,dendrite morphology and dendrite arm spacings have no obvious change,volume fraction of eutectic is significantly decreased,and the primary carbide is gradually increased.The primary carbide morphologies in this alloy commonly are blocky,framework-like and Chinese-script-like.When the carbon level is high,the carbide morphology becomes net-like by frame-like carbides connecting each other （Chinese script morphology）.
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