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Carbide Formation Process in Directionally Solidified MAR-M247 LC Superalloy

Journal of Materials Science & Technology 1999年第1期15卷 48-52页

作者： Chen, Jian Huang, Baiyun Lee, J.H. Choe, S.J. Lee, Y.T. Cent S univ Technol Powder Met Res Inst Changsha 410083 Peoples R China changwon natl univ Dept Met & Mat Sci Changwon 641773 South Korea Korea Inst Machinery & Mat Changwon 641010 South Korea

Carbide nucleation, growth and trapping behavior in directionally solidified MAR-M247 LC alloy and the corresponding mechanism have been investigated. Carbide forming element enrichment controls the carbide nucleation and the carbide growth behavior. If the carbide forming element enrichment and the nucleation sites are suitable, carbide nucleation can occur both above and below the liquids temperature. Heterogeneous carbide nucleation is the preferred nucleation mechanism at low carbide forming element enrichment. Carbide growth occurs mainly at inter-secondary gamma dendrite arm area and lower part of the mushy zone. The carbides are subsequently trapped at these positions after growing to a certain size. Some carbides are only partially trapped by the solid-liquid interface and the carbide growth accelerates after being partially trapped. A critical growth rate exists between 2 multiplied by 10** minus **6 m/s and 5 multiplied by 10** minus **6 m/s. The carbide volume fraction decreases in the directionally solidified part at slow growth rate which is caused by the lack of suitable growth site and the low trapping ability of the solid-liquid interface. (Edited author abstract) 16 Refs.

关键词： Nickel alloys

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Formation and Morphology of Anodic Oxide Films of Ti

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Journal of Materials Science & Technology 2001年第1期17卷 33-34页

作者： Kyo-Han Kim X.L.Zhu and Won-Woo Son Department of Dental Biomaterials, Kyungpook National university, Taegu 700-422, Korea Yong-Soo Jeong Department of Surface Engineering, Korea institute of Machinery and Materials, changwon, Korea Dep. of Dental Biomater. Kyungpook Natl. Univ. Taegu 700-422 South Korea

The morphology and structure of the oxide films of Ti in H3PO4 were investigated by galvanos tatic anodization, SEM and XRD. The oxide film grew from some pores in the grooves to layered microdomains as increasing anodizing voltage. The crystallinity of the oxide films decreased with the increase of the concentration of the electrolyte. The model has been proposed for the growth of the oxide films by two steps, i.e. by uniform thickening and by local deposition.

关键词： Res Formation and Morphology of Anodic Oxide Films of Ti

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