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本文系统地研究了硼和碳对一种Ni-Fe-Cr基高温合金力学性能和组织的影响,发现硼对晶界强化作用比碳大得多,不论固溶硼原子还是硼化物皆可以显著地提高合金的持久强度.添加硼能明显地改善合金的晶界状态和强烈地抑制η等有害相的析出,提高晶界组织稳定性.含0.007％B和<0.04％C时,合金持久性能最佳. 硼和碳对合金的拉伸强度影响不大,但能明显地提高合金的拉伸塑性.为获得良好的拉伸性能,硼和碳含量应分别高于0.002％和0.02％.
In this paper, the effects of boron and carbon on the mechanical properties and microstructure of a Ni-Fe-Cr based superalloy were systematically studied. It was found that the strengthening effect of boron on the grain boundaries was much greater than that of carbon, both solute boron atoms and borides To improve the long-term strength of the alloy.Add boron can significantly improve the grain boundary state of the alloy and strongly inhibit the precipitation of η and other harmful phases, improve the grain boundary microstructure stability containing 0.007% B and <0.04% C, the alloy durability Boron and carbon have little effect on the tensile strength of the alloy, but can significantly improve the ductility of the alloy.In order to obtain good tensile properties, boron and carbon content should be higher than 0.002% and 0.02% respectively.