电脉冲对不锈钢形变马氏体及其耐蚀性的影响

EFFECT OF ELECTRIC PULSE ON THE DEFORMATION MARTENSITE AND CORROSION RESISTANCE OF STAINLESS STEELS

亚稳奥氏体不锈钢冷变形后产生形变诱发马氏体 ,影响其物理和化学性能 .对打磨后的亚稳奥氏体不锈钢进行了阳极 6 0s～ 2 80s+阴极 30s～ 2 80s,9h电脉冲处理 .用X射线衍射分析、显微硬度测量、自腐蚀电位测量和金相分析等方法分析处理前后的马氏体含量、表面硬度、耐腐蚀性 .结果表明处理后表面马氏体均减少 .随脉冲宽度的不同 ,电脉冲处理可以诱发电化学退火 ,也可以导致马氏体优先腐蚀 .当发生电化学诱导退火时 ,不锈钢不仅在马氏体减少后仍可以保持高硬度 ,而且在含Cl-介质中的耐蚀性也提高 .

The deformation induced martensite in metastable austenite stainless steels effects their physical and chemical properties.Worn metastable austenite stainless steel was treated with electric pulse of anode 60s～280s+cathode 30s～280s for 9h.XRD analyge,microhardness test,corrosion potential test and metallographic observation were used to analyze the amount of martensite,surface hardness and corrosion resistance before and after the treatment.The results show that the amount of martensite always decreases after the treatment.According to the various pulse width,the treatment can induce electrochemical annealing,it can also cause the priority corrosion of martensite.When electrochemically induced annealing happens,the treatment can not only keep the high hardenss after the amount of martensite decreases,but also promote the corrosion resistance of the stainless steel in Cl - containing solution.