塑性变形对AISI304不锈钢组织及耐蚀性的影响

化工学报 ›› 2003, Vol. 54 ›› Issue (6): 790-795.

塑性变形对AISI304不锈钢组织及耐蚀性的影响

许淳淳; 张新生; 胡钢

北京化工大学材料科学与工程学院

出版日期:2003-06-25 发布日期:2003-06-25

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

XU Chunchun, ZHANG Xinsheng,HU Gang

Online:2003-06-25 Published:2003-06-25

摘要/Abstract

摘要： AISI304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50 ℃条件下0.5 mol·L^-1 MgCl₂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AISI304不锈钢中位错密度随变形量增大而增加，AISI304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AISI304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.

关键词:

AISI304不锈钢, 塑性变形, 位错, 马氏体相变, 击穿电位

Abstract: Plastic deformation of AISI304 stainless steel was carried out at -70 ℃ and 180 ℃. 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·L^-1 MgCl₂ solution at 50 ℃. The results showed that plastic deformation at both -70 ℃ and 180 ℃ made the dislocation density of AISI304 stainless steel increase with the increase of deformation. Martensite phase transformation was induced for deformation at -70 ℃, whereas it was not at 180 ℃. 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.

Key words:

AISI304不锈钢, 塑性变形, 位错, 马氏体相变, 击穿电位

许淳淳, 张新生, 胡钢. 塑性变形对AISI304不锈钢组织及耐蚀性的影响 [J]. 化工学报, 2003, 54(6): 790-795.

XU Chunchun, ZHANG Xinsheng, HU Gang. EFFECT OF PLASTIC DEFORMATION ON TEXTURE AND CORROSION RESISTANCE OF AISI304 STAINLESS STEEL[J]. CIESC Journal, 2003, 54(6): 790-795.