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中文摘要：
有在二种镍底 superalloys， K417G 和 DD33 使率和碳内容凉下来的变化的 MC 碳化物的形态学的进化，被调查了。MC 碳化物的形态学从 faceted 演变到与增加像手迹冷却的率。从 40 ×10 −6 改变碳内容到碳化物的形态学变化从的 320 ×10 −6, 短而粗，进像杆像手迹。扫描深蚀刻的样品的电子显微镜学观察显示这些碳化物演变从对八面树枝状然后进开发得好的树突因此以一种三维的方式。形态学进化在方向性的团结期间从 fcc 晶体和碳化物生长率的优先的生长取向的观点被讨论。
英文摘要：
Evolution of the morphology of MC carbides with the change of cooling rate and carbon content in two kinds of nickel-base superalloys, K417 G and DD33, has been investigated. The morphology of MC carbides evolves from faceted to script-like with increasing cooling rate. Varying the carbon content from 40X10-6 to 320X10-6, the morphology of carbides changes from blocky, rod-like into script-like. Scanning electron microscopy observation of deep-etched samples indicates that these carbides evolve from octahedral to dendritic and then into welldeveloped dendrites accordingly in a three-dimensional manner. The morphology evolution is discussed from the viewpoint of the preferential growth orientation of fcc crystals and the carbide growth rate during directional solidification.
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