深冷时间对2906超级双相不锈铸钢组织及性能的影响  

Effects of Cryogenic Time on Microstructure and Properties of 2906 Super Duplex Stainless Steel

作　　者：黄伟林[1] 向红亮[2] 陈彤[1] 陈朝阳[1] 

机构地区：[1]国网福建省电力有限公司电力科学研究院,福州350007 [2]福州大学机械工程及自动化学院,福州350108

出　　处：《腐蚀与防护》2015年第7期614-619,共6页Corrosion & Protection

基　　金：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);福州大学科技发展基金项目(2008-QX-16)

摘　　要：对经过-196℃深冷处理0、4、8和12h的固溶态2906超级双相不锈钢的组织和性能进行研究。采用金相显微镜(OM)、X射线衍射仪(XRD)、环境扫描电子显微镜(ESEM)、万能材料试验机、洛氏硬度计和电化学极化曲线研究了深冷保温时间对材料组织、力学性能和耐蚀性能的影响。结果表明,随着深冷保温时间的延长,组织中的奥氏体相含量先上升后逐渐降低,材料硬度也出现先升后降的规律,但耐蚀性随时间延长而增强;深冷处理降低材料抗拉强度,深冷保温时间越长抗拉强度越小;材料的断裂方式皆为韧性断裂,深冷4h时材料的延伸率达到最大值。The effects of cryogenic treatment time （0 h, 4 h, 8 h, 12 h） on the microstructure, mechanical properties and corrosion resisting property of 2906 super duplex stainless steel （SDSS） after solution treatment were studied by means of optical microscope（OM）, Xray diffraction（XRD）, environmental scanning electron microscope （ESEM）, universal testing machine, rockwell hardness tester and electrochemical polarization curves. The results indicated that the γ phase content and the hardness increased first and then dropped with the extension of the cryogenic time; the corrosion resistance of this material increased with the extension of cryogenic time~ cryogenic treatment could reduce the tensile strength, and the longer the cryogenic time, the less the strength values~ the main fractography was composed of dimples; elongation reached the maximum after cryogenic treatment for 4 h.

关 键 词：2906超级双相不锈钢 深冷时间 两相组织 力学性能 耐蚀性 

分 类 号：TG174[金属学及工艺—金属表面处理]