【摘要】 设计并熔炼了不同硅含量的三种耐磨耐蚀合金30Ni-35Cr-6.5Mo-1Nb-0.25N-xSi（x=1、2、3）-Fe,分别命名为1Si、2Si、3Si合金,利用SEM、XRD、硬度测试以及电化学测试研究了三种合金的组织和性能。结果表明,三种合金均为双相结构,两相分别为γ相和σ-Cr₁₃Ni₅Si₂相,且随着硅含量的增加,σ-Cr₁₃Ni₅Si₂相所占的比例逐渐增加,合金的洛氏硬度也逐渐增大。动电位极化曲线以及电化学阻抗谱结果表明,3Si合金在10%H₂SO₄溶液中的耐蚀效果最优,而1Si合金的耐蚀性最差。合金硬度和耐蚀能力的提高主要得益于合金中σ相比例的增大。更多还原

【Abstract】 Three Si-containing wear-resistant and corrosion-resistant alloys 30 Ni-35Cr-6.5Mo-1Nb-0.25N-xSi（x=1, 2, 3）-Fe, named 1 Si, 2 Si, 3 Si, were designed and melted. SEM, XRD, hardness test and electrochemical test were conducted to study the microstructure and properties of the three alloys. The results show that the three alloys have a dual-phase structure of γ-phase and σ-Cr₁₃Ni₅Si₂, and the proportion of σ-Cr₁₃Ni₅Si₂ phase gradually increases with increasing silicon content; the Rockwell hardness HRC of the alloys also gradually increases. Potential polarization curves and electrochemical impedance spectroscopy results show that the 3 Si alloy has the best corrosion resistance in 10% H₂SO₄ solution, while the 1 Si alloy has the worst corrosion resistance. The increase in hardness and corrosion resistance of alloys is mainly due to the increase in σ phase ratio.更多还原