固溶温度对29Cr铸造超级双相不锈钢组织和性能影响.pdf

学兔兔 Mar．2011 铸 造 V0I．60 N0．3 F0UNDRY ·247 · 固溶温度对29C r铸造超级双相不锈钢 组织和性能的影响 向红亮，刘 东，黄伟林，何福善 (福州大学机械工程及自动化学院，福建福州350108) 摘要：用常规中频炉制备了29Cr超级双相不锈钢，通过OM、SEM、EDS、xRD和电『匕学Z-作站研究了固溶温度对 29Cr铸造超级双相不锈钢组织和性能的影响。试验结果表明：在1 050～l l50℃内对29Cr铸造超级双相不锈钢进行固溶处 理时，cr在铁素体与舆氏体两相中的分配系数 (K )对材料性能的影响起主导作用，随固溶温度升高，K r先上升后下降， Cr的分配系数越小强度越高，但耐蚀性越差；在1 1o0℃固溶处理时，其强度及塑性达到最大值，分别为825MPa和 35％，而待蚀电流密度为0．603 p．A·cm-2，耐蚀性最差。 关键词：29Cr；超级双相不锈钢；同溶温度；力学性能；耐蚀性能 中图分类号：TG151．1；TGI42．71 文献标识码：A 文章编号：1001—4977(201 1)03—0247—05 Effects of Solution Temperature on Microstructure and Properties of 29Cr Cast Super Duplex Stainless Steels XIANG Hong—liang，LIU Dong，HUANG Wei—lin，HE Fu—shan (School of Mechanical Engineering and Automation，Fuzhou University， Fuzhou 3501 08，Fujian，China) Abstract：29Cr super duplex stainless stee J was prepared with J F furnace．The effects of solution temperature on microstructure，mechanicaI properties and corrosion resisting property of 29Cr cast super duplex stainless stee1 were studied by means of optical microscope (OM)．scanning electron microscopy(SEM)，energy dispersive spectrometry(EDS)，X—ray diffraction(XRD) and electrochemicaI polarization curve．The results indicate that the partition coefficient of Cr( )in two phases plays a leading role on the properties when the solution tem perature iS 1 050—1 1 50℃．W_lh increasing solution temperature，K0 increases first and then decreases．The Iower the K0，the higher the strength and the worse the corrosion resistance．The maximum strength and．plasticity respectively are 825 MPa and 35％ at solution treatment temperature 1