N含量对29Cr铸造超级双相不锈钢组织及性能的影响
收稿日期: 2009-09-23
修回日期: 2010-01-14
网络出版日期: 2010-03-11
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
EFFECTS OF N CONTENT ON MICROSTRUCTURE AND PROPERTIES OF 29Cr CASTING SUPER DUPLEX STAINLESS STEEL
Received date: 2009-09-23
Revised date: 2010-01-14
Online published: 2010-03-11
Supported by
Supported by Program for Service of Enterprise by Technical Personnel, the Ministry of Science and Technology of China (No.2009GJC40018), Innovation Foundation for Young Talent of Fujian Province (No.2008F3061) and Technological Development Foundation of Fuzhou University (No.2008-XQ-16)
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.
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 . DOI: 10.3724/SP.J.1037.2009.00641
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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