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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 19    Special 2    September 2009

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Microstructure evolution of as-cast Nb-Ti-C alloys
WEI Wen-qing(魏文庆)1, WANG Hong-wei(王宏伟)1, GAO Zeng-xin(高增新)2, WEI Zun-jie(魏尊杰)1

1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;
2. Beijng Xinghang Mechanical Electrical Equipment Factory, Beijing 100074, China

Abstract:Nb-Ti-C alloys with different Ti contents (4%−16%, mole fraction) were fabricated by vacuum non-consumable arc-melting method. The results indicate that the alloys contain niobium solid solution (Nbss), carbides (Nb2C, (Nb, Ti)C) and eutectic of Nbss/MC. Carbides in the Nb-Ti-C alloys change from Nb2C to (Nb, Ti)C with the increase of titanium content. Microstructures in the as-cast state include primary plate-like Nb2C, eutectic of Nbss/Nb2C, Nbss and secondary needle-like Nb2C in Nb-5Ti-4C alloy, and other microstructures are primary Nbss, eutectic of Nbss/(Nb, Ti)C. Morphology of carbides are changed apparently through adding different Ti contents, and morphology of Nbss changes from the cellular structure to dendrite.

 

Key words: Nb-Ti-C alloy; carbide transformation; niobium solid solution

ISSN 1672-7029
CN 43-1423/U

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