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))1/2+626.3和δ=60×w(N)+10.83. 在海水腐蚀过程中, 铁素体优先腐蚀. N使 Cr的分布均匀化, 并参与腐蚀反应生成NH4+和NO3-, 促进钝化膜的再钝化; Mo可以生成MoO42-, 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 $\gamma$ 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))1/2+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 NH4+ and NO3- to promote the re-passivation effect of passive film; and Mo can form MoO42- 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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