Effect of Solidification Condition and Carbon Content on the Morphology of MC Carbide in Directionally Solidified Nickel-base Superalloys

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 fr...

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Bibliographic Details
Published in:Journal of materials science & technology 2014-12, Vol.30 (12), p.1296-1300
Main Authors: Li, X.W., Wang, L., Dong, J.S., Lou, L.H.
Format: Article
Language:English
Subjects:
Carbides
Carbides morphology
Carbon content
Cooling rate
Directional solidification
Evolution
MC碳化物
Morphology
Nickel base alloys
Nickel-base superalloys
Superalloys
Three dimensional
Three-dimensional microstructure
凝固条件
定向凝固
形态演变
形貌
电子显微镜观察
碳含量
镍基高温合金
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Summary: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.
ISSN:1005-0302
1941-1162
DOI:10.1016/j.jmst.2014.06.010