相同热处理后4不同N含量Inconel 690合金(Ni-30Cr-10Fe-xN (x=0.001,0.011,0.018,0.030,质量分数,％))晶界M23C6析出形貌和Cr贫化存在明显差异,N在晶界有明显偏聚行为.随着N含量的增加,TiN析出量和退火孪晶增多,TT处理后晶界析出的碳化物细小而离散,晶界Cr贫化得到改善.室温拉伸结果表明,N含量由0.001％增加到0.030％时,合金室温屈服强度和抗拉强度均提高约50 MPa,而延伸率和断面收缩率仅稍有降低.含N合金断裂方式均为韧性断裂,韧窝尺寸随N含量增加而减小.
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