调整处理对0Cr17Ni4Cu4Nb钢组织及耐蚀性的影响

运用极化曲线、循环极化曲线等电化学方法研究了0Cr17Ni4Cu4Nb钢经不同工艺热处理后的耐海水腐蚀性能,并对显微组织进行了观察和分析.实验结果表明:固溶处理后的0Cr17Ni4Cu4Nb钢加入调整处理后再进行时效处理,组织更加均匀细小且击破电位、钝化区宽度及保护电位均有明显的提高,耐海水腐蚀性能全面优于直接时效态试样.调整处理的加入及参数的变化导致加热过程中合金碳化物的析出数量和种类发生变化,从而对其组织及耐蚀性能产生了影响.

Effect of Modification Parameters on Microstructure and Anticorrosivity of 0Cr17Ni4Cu4Nb Steel

The anticorrosivity and microstructure of 0Cr17Ni4Cu4Nb steel in artificial seawater after different heat treatment processes were investigated by electrochemical methods, such as polarization and cyclic polarization curves. The results indicated that if a modification follows the solution treatment of 0Cr17Ni4Cu4Nb steel before aging treatment, the steel structure will become finer and more homogeneous with the breakdown potential, width of passivation zone and protection potential all enhanced obviously. Thus, the anticorrosivity of the steel in seawater will be entirely superior to the steel without the modification. The modification and changes in its parameters will result in the variation of the quantity and sorts of carbide precipitates during heating, thus affecting the microstructure and anticorrosivity of the steel.