【摘要】 本文着重研究了0～25％铁对Ni-Cr-Mo-Al-Ti型镍基铸造合金组织及性能的影响。研究表明,随含铁量增加合金中γ′数量减少,尺寸变小,形态由立方状变为球状;MC量增多,而M₂₃C₆及M₃C₂量减少;铁明显地改变合金元素在γ-γ′中的分配关系,并提高合金的平均电子空位数（?）_v,从而促进σ相析出。随含铁量增加,合金中有害微量元素增加,铁严重地降低持久强度,但对拉伸强度影响较小,铁高时合金塑性下降。更多还原

【Abstract】 The inflnence of Iron (0-25% ) on the microstructure and properties of a cast Nickel-Base superalloy is examined The results of this study show, that the gamma prime fraction in alloy and gamma prime size decrease with the Iron addition in alloy. The morphology of gamma prime is changed from cube to spheroid and the amount of MC is increased, but both amount of M23C8 and M3B2 are reduced as Iron cou-tent iucreases. The partition ratio of alloying elements between γ-γ’ is changed and average electron-vacancy number Nv is increased apparently by Iron addition in alloy, thus the precipitation of sigma phase is accelerated. The amount of harmful elements is increased with Iron addis-ion in alloy. Iron addition in alloy severely decreases the stress rept-ure, but slightly iufluences the tensile strength of this cast nickelbase superalloy. Simultaneously, the ductility of alloy with high Iron content is low.更多还原