时效时间对铸造2507双相不锈钢组织及性能影响  

Effect of aging time on microstructures and properties of cast 2507 duplex stainless steel

作　　者：刘东[1] 杨彩萍[1] 

机构地区：[1]福州大学机械工程及自动化学院,福建福州350116

出　　处：《福州大学学报（自然科学版）》2013年第6期1061-1065,共5页Journal of Fuzhou University(Natural Science Edition)

基　　金：福建省高等学校新世纪优秀人才支持计划资助项目(JA10014)

摘　　要：对固溶态的铸造2507双相不锈钢材料在750℃下分别时效2、6及10 h,利用OM、SEM、拉伸试验和电化学试验分析了时效时间对材料金属间相形貌及数量、力学性能和耐蚀性能的影响.试验结果表明:固溶后的材料经750℃时效处理,随时效时间延长,金属间相的数量逐渐增多,χ相先由颗粒状逐渐长大为块状,然后又细化;σ相则随时效时间的延长逐渐粗化.析出的金属间相越多,材料抗拉强度、塑性及耐蚀性越低.点蚀优先在铁素体内及铁素体/奥氏体晶界上萌生,并向铁素体扩展,并且时效后材料腐蚀电流密度与时效时间呈现J腐蚀r=0.691 25 t+1.432的线性关系.The effects of aging treatments at 750 ℃for 2, 6 and 10 h respectively on microstructure, mechanical property and corrosion resistance of solution - treated cast 2507 duplex stainless steel were studied by means of optical microscope （OM）, scanning electron microscopy （SEM）, tensile test and electrochemical test. The result indicted that： with the aging time extending, the number of interme- tallic phases gradually increased at 750 ℃ aging. X phase first was granular, and gradually grow mas- sive, then refinement; σ phase becomes coarser with aging time extension. The more precipitated in- termetallic phases, the tensile strength, ductility and corrosion resistances were worse. The pitting ini- tiated priority in ferrite and ferrite / austenite grain boundaries, then extended to ferrite. The corrosion current density and the aging time oresents the linearrelationship of Jcorr=0.691 25 t ＋ 1. 432.

关 键 词：铸造双相不锈钢 时效时间 金属间相 力学性能 耐蚀性能 

分 类 号：TG172.8[金属学及工艺—金属表面处理]