金属学报  1982, Vol. 18 Issue (3): 255-263

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高温合金铸件表面晶粒细化的研究

方建;于彬

北京航空学院;国营东安机械厂

INVESTIGATION OF SURFACE GRAIN REFINEMENT OF SUPERALLOY CASTINGS

Fang Jian (Beijing Institute of Aeronautics and Astronautics); Yu Bin (Dong An Machine Works; Harbin)

方建;于彬. 高温合金铸件表面晶粒细化的研究[J]. 金属学报, 1982, 18(3): 255-263.
, . INVESTIGATION OF SURFACE GRAIN REFINEMENT OF SUPERALLOY CASTINGS[J]. Acta Metall Sin, 1982, 18(3): 255-263.

摘要 参考文献 相关文章 Metrics 全文: PDF(1525 KB)   摘要: 本文对国内外关于高温合金铸件表面晶粒细化机理的几种观点作了验证;用X射线,显微镜和电子探针法对效果不同的型壳作了分析,发现铸件晶粒的细化与铝酸钴的分解以及合金中的活性元素有关;从浇铸后的型壳表面、铸件表面以及铝酸钴粉加不同活性元素的真空加热后的产物中均发现了Co(高温型)粒子。本文也做了铝酸钴加Al粉的真空差热分析并作了热力学计算,证明Co粒子的生成并不伴随着吸热,实际却是一个不大的放热效应。综合诸实验,作者认为铸件表面晶粒细化主要是由于Co粒子的核心作用;据此也探讨了合理的工艺,并巳用于工厂生产中,效果显著。 Abstract：The mechanism of the surface grain refinement for superalloy castings has been investigated by examination of some recent allied approaches and by observations on the investment molds of various effectiveness using X-ray diffraction, microscopy and EPMA. It was identified that the grain refinement of the castings is dependent upon the decomposition of cobalt aluminate and the active alloying elements contained in the alloy. After the alloy casted, the isolated particles of high temperature type cobalt were found on the surfaces of the investment mold and the castings, as well as the products of the mixture of cobalt aluminate together with different active elements heated under vacuum. Both the vacuum DTA of cobalt aluminate mixed with Al powder and the thermodynamical estimation of the reaction may confirm that the formation of Co particles did not accompany with an endothermic peak as formerly expected, but, in fact, a small exothermie effect was observed. It seems that the surface grain refinement of the castings is mainly due to the nucleation of the cobalt particles produced during casting. Thus, a rationalized process proposed has already been put into industrial practice with remarkable results. 收稿日期: 1982-03-18      服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 方建 于彬 44.8K 链接本文: https://www.ams.org.cn/CN/      或      https://www.ams.org.cn/CN/Y1982/V18/I3/255 1 Restall, J. E.; Toulson, E. C., Met. Mater., 7 (1973) , 187． 2 #12 3 Levin, E. M., Phase Diagram for Ceramists, Am. Ceram. Soc., 2nd ed., 1969, p. 109． 4 Feagin, R. C., Dipcoat Nucleation, European Investment Caster's Federation Proceedings of the 12th Conference 1967, Ⅻ-1． 5 Feagin, R. C., U. S. Pat. 3 259 948, 1966． 6 Navrotsky, A.; Kleppa, O. J., J. Inorg. Nucl. Chem., 30 (1968) , 479． No related articles found! Viewed Full text Abstract Cited   Shared      Discussed