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金属学报  2010 

N含量对29Cr铸造超级双相不锈钢组织及性能的影响

DOI: DOI:10.3724/SP.J.1037.2009.00641, PP. 304-310

Keywords: 29Cr超级双相不锈钢,N含量,抗拉强度,延伸率,极化曲线,钝化膜

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Abstract:

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.

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