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采用真空非自耗电弧炉熔炼了四种P含量(0.005%,0.02%,0.05%,0.15%(质量分数))的NiAl-34Cr-xP合金.铸态合金的组织均含有NiAl相和Cr相,为典型的胞状树枝晶组织,且随着P含量的增加胞状树枝晶的平均尺寸逐渐减小.在P含量为0.05%和0.15%的合金中还存在Cr3P相.均匀化热处理后合金的共晶胞尺寸与铸态合金相比稍有增加.均匀化热处理均使同种成分合金的硬度降低,且温度越高,硬度降低越多,原因是高温处理使Cr相聚集长大和共晶胞尺寸变大.

参考文献

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