塑性变形对AISI304不锈钢组织及耐蚀性的影响  

EFFECT OF PLASTIC DEFORMATION ON TEXTURE AND CORROSION RESISTANCE OF AISI304 STAINLESS STEEL

作　　者：许淳淳[1] 张新生[1] 胡钢[1] 

机构地区：[1]北京化工大学材料科学与工程学院,北京100029

出　　处：《化工学报》2003年第6期790-795,共6页CIESC Journal

基　　金：国家重点基础研究发展规划项目 (No G19990 65 0 )~~

摘　　要：AISI30 4不锈钢分别在加热 180℃和低温 - 70℃条件下进行拉伸变形。采用透射电镜观测位错分布 ,利用铁素体测量仪测定马氏体相 (铁磁相 )含量 ,并通过电化学滞后技术分别研究它们在 5 0℃条件下 0 5mol·L-1MgCl2 水溶液中的腐蚀行为 .结果表明 :加热 180℃和低温 - 70℃条件下塑性变形均使AISI30 4不锈钢中位错密度随变形量增大而增加 ,AISI30 4不锈钢在 - 70℃条件下塑性变形时部分奥氏体相转变为马氏体相 ,而在180℃条件下塑性变形时不发生马氏体相变 ;位错密度的增加使AISI30 4不锈钢钝化膜的击穿电位略微正移 ,而马氏体相的增加使击穿电位呈负移趋势 ,材料耐孔蚀性能降低 .Plastic deformation of AISI304 stainless steel was carried out at -70°C and 180°C. The distribution of dislocations was observed with transmission electron microscope (TEM), martensite phase content was determined by use of ferrmagnetometer, and the corrosion behavior of AISI304 stainless steel was studied by potentiodynamic polarization in 0.5 mol&middotL-1 MgCl2 solution at 50°C. The results showed that plastic deformation at both -70°C and 180°C made the dislocation density of AISI304 stainless steel increase with the increase of deformation. Martensite phase transformation was induced for deformation at -70°C, whereas it was not at 180°C. As the dislocation density increased, the breakdown potential of AISI304 stainless steel's passive film became a little more positive. As martensite phase content increased, it became more negative and pitting corrosion resistance decreased.

关 键 词：AISI304不锈钢 塑性变形 位错 马氏体相变 击穿电位 

分 类 号：TG142.71[一般工业技术—材料科学与工程]