相同热处理后不同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.
The microstructure and mechanical property at room temperature of Ni-30Cr-10Fe-xN (x=0.001, 0.011, 0.018, 0.030, mass fraction, %) base alloy 690 were investigated. The OM observation shows that the amounts of precipitated nitrides and the annealing twins in the matrix increase with more nitrogen added in the alloy. The carbide precipitation along boundary and the chromium depletion near the grain boundary are modified by nitrogen addition, carbide becomes less and chromium depletion is mitigated. The tensile test result shows that both of the yield and tensile strengths are increased by about 50 MPa when nitrogen content increased from 0.001% to 0.030%, while the ductility lowers a little. The fractographs exhibit typical ductile dimple pattern and the sizes of the dimples reduce with increasing nitrogen content in the alloy.
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