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)
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.
XIANG Hong-Liang , HUANG Wei-Lin , LIU Dong , HE Fu-Shan . EFFECTS OF N CONTENT ON MICROSTRUCTURE AND PROPERTIES OF 29Cr CASTING SUPER DUPLEX STAINLESS STEEL[J]. Acta Metall Sin, 2010 , 46(3) : 304 -310 . DOI: 10.3724/SP.J.1037.2009.00641
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