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金属学报  2010, Vol. 46 Issue (3): 304-310    DOI: 10.3724/SP.J.1037.2009.00641
  论文 本期目录 | 过刊浏览 |
N含量对29Cr铸造超级双相不锈钢组织及性能的影响
向红亮; 黄伟林; 刘东; 何福善
福州大学机械工程及自动化学院; 福州 350108
EFFECTS OF N CONTENT ON MICROSTRUCTURE AND PROPERTIES OF 29Cr CASTING SUPER DUPLEX STAINLESS STEEL
XIANG Hongliang; HUANG Weilin; LIU Dong; HE Fushan
School of Mechanical Engineering and Automation; Fuzhou University; Fuzhou 350108
引用本文:

向红亮 黄伟林 刘东 何福善. N含量对29Cr铸造超级双相不锈钢组织及性能的影响[J]. 金属学报, 2010, 46(3): 304-310.
, , , . EFFECTS OF N CONTENT ON MICROSTRUCTURE AND PROPERTIES OF 29Cr CASTING SUPER DUPLEX STAINLESS STEEL[J]. Acta Metall Sin, 2010, 46(3): 304-310.

全文: PDF(1124 KB)  
摘要: 

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.

关键词 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    
Abstract

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.

Key words29Cr super duplex stainless steel    N content    tensile strength    elongation    polarization curve    passive film
收稿日期: 2009-09-23     
基金资助:

科技部科技人员服务企业项目2009GJC40018, 福建省青年人才创新基金项目2008F3061和福州大学科技发展基金项目2008-XQ-16资助

作者简介: 向红亮, 男, 1972年生, 副教授

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