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利用光镜、扫描电镜和能谱仪等显微组织分析方法研究了镍基耐蚀合金C-276经真空冶炼+电渣重溶后铸锭的枝晶特点和元素偏析情况,根据残余偏析指数模型计算结果选取了四种均匀化实验制度,并通过均匀化实验后的组织分析和Gleeble1500试验机热模拟锻造实验验证,最终确立了适合C-276合金的均匀化工艺.结果表明:合金中偏析程度最严重的元素为Mo;在选取的四种均匀化制度中,采用1170℃下加热20h的处理方式不仅可以较好地实现成分均匀化,还能保证晶粒尺寸不过度长大,从而确保合金的热加工塑性,是最为合理的均匀化制度.实验也证明利用残余偏析指数模型,计算结果与实验结果基本吻合,在预测和评价C-276合金均匀化工艺上是可信的.
The characteristics of dendrites and elemental segregation of Ni-based anticorrosive alloy C-276 after vacuum smelting + electroslag remelting were investigated by means of microscopy, scanning electron microscopy and energy dispersive spectroscopy. According to the residual segregation index Four homogenization experimental systems were selected according to the model calculation results and the homogenization process for C-276 alloy was finally established through the homogenization microstructure analysis and Gleeble1500 thermal simulation forging experiment.The results show that the segregation The most serious element is Mo; the selected four kinds of homogenization system, the use of 1170 ℃ heating 20h treatment can not only achieve better composition uniformity, but also ensure that the grain size does not grow too much, so as to ensure It is proved that the residual segregation index model is consistent with the experimental results and it is credible in predicting and evaluating the homogenization process of C-276 alloy.