制备了含N量分别为0.11%,0.26%和0.42%的29Cr铸造超级双相不锈钢,利用XRD,SEM,EDS,电化学工作站和XPS研究了含N量对双相不锈钢显微组织、力学性能和耐蚀性的影响,结果表明:N能增加双相不锈钢中奥氏体含量,并且有φ(γ)= 60×w(N)+21.97的线性关系;由于N具有固溶强化和降低(Mn,Cr)S夹杂粒子的作用,能有效提高材料的抗拉强度和延伸率,两者与含N量的关系分别为σb = 318.33×√w(N)+626.3和δ=60×w(N)+10.83.在海水腐蚀过程中,铁索体优先腐蚀.N使Cr的分布均匀化,并参与腐蚀反应生成NH_4~+和NO_3~-,促进钝化膜的再钝化;Mo可以生成MoO_4~(2-),提高钝化膜的稳定性,增强耐蚀性,钢中含N量越高,腐蚀电流密度越低,耐蚀性越好.
Microstructures, mechanical properties and corrosion resistances of 29Cr super duplex stainless steel (SDSS) with N contents of 0.11%, 0.26% and 0.42% have been investigated by XRD,SEM, EDS, electrochemical workstation and XPS. The results show that with increasing N content the distribution of Cr becomes homogeneous, the amount of γ phase increases according to a linear relationship of φ(γ) = 60 × w(N)+21.97, and the tensile strength and elongation of the steel are improved according to the relationships of σb = 318.33 ×√ w(N)+626.3 and δ = 60 × w(N)+10.83, respectively, due to the roles of solution strengthening and reducing (Mn, Cr)S precipitation. In the process of seawater corrosion,α phase in the steel would be corroded first, N can form NH_4~+ and NO_3~- to promote the re-passivation effect of passive film; and Mo can form MoO_4~(2-) to improve the stability of passivated layer and strengthen the corrosion resistance of the steel. The higher the N content, the lower the corrosion current density and the better the corrosion resistance for the steel.
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