Abstract: The new Ni-Cr-Fe nickel base alloy ( % ： 0. 036 ~ 0. 044C, 16. 71 ~ 17. 10 Cr, 63. 04 ~ 63. 95Ni, 8. 98 〜 10. 76Fe, 2.50〜2.88Mo, 2.01 ~4.97Nb, 0. 06V, 0. 74 ~0. 82Al, 2.00〜2.06Ti) is melted by a 25kg vacuum induction furnace and forged to Φ15 mm and 14 mm x 14 mm bar products. The effect of niobium content on structure and mechanical properties of the 65Ni~18Cr-10Fe alloy has been studied by busing scanning electron microscope, X-ray diffractometer, chemical phase analysis and tensile tester. Results show that with increasing niobium content in alloy, the precipitated amount and dimension of γ′、γ″ and η phase increase, of which the morphology changes from discontinuous particles or short clubs to long lamellae led to increment of ambient tensile strength of alloy and decrease of plasticity.

摘要： 新型Ni-Cr-Fe镍基合金(%:0.036～0.044C、16.71～17.10Cr、63.04～63.95 Ni、8.98～10.76Fe、2.50～2.88Mo、2.01～4.97Nb、0.06V、0.74～0.82Al、2.00～2.06 Ti)由25 kg真空感应炉熔炼,锻成Φ15 mm和14mm×14 mm棒材。采用扫描电镜(SEM),X射线衍射仪(XRD),化学相分析和拉力试验研究了铌含量对65Ni18Cr-10Fe合金组织和性能的影响。结果发现,随着合金中铌含量的增加,γ′、γ″、η相的析出数量增多,尺寸增大,形态由断续的颗粒、短棒状改变为长片层状;导致合金的室温强度随之升高,而塑性随之下降。

关键词: 镍基合金, 铌, 力学性能, 析出相