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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M_(23)C_6及M_3C_2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。
This article focuses on the effect of 0-25% iron on the microstructure and properties of Ni-Cr-Mo-Al-Ti Ni-based cast alloys. The results show that with the increase of iron content, the amount of γ ’decreases, the size becomes smaller and the shape changes from cubic to spherical. The amount of MC increases, while the amount of M_ (23) C_6 and M_3C_2 decreases. The content of γ -γ ’, and increase the average electron vacancy (v) v of the alloy, so as to promote the σ-phase precipitation. With the increase of iron content, the content of harmful trace elements in the alloy increased, the iron seriously reduced the lasting strength, but had little effect on the tensile strength, and the plasticity decreased when the iron content was high.