Surface Nanocrystallization of Nb-Ti Stabilized 439M Ferritic Stainless Steel  

作　　者：Yao-chun ZHANG Chao CHEN Cheng-jia SHANG Dong-yang LI 

机构地区：[1]Nuclear Equipment Division,CNNC China Nuclear Power Engineering Co.,Ltd. [2]School of Materials Science and Engineering,University of Science and Technology Beijing [3]Department of Chemical and Materials Engineering,University of Alberta,Edmonton T6G2V4,Alberta,Canada

出　　处：《Journal of Iron and Steel Research International》2014年第9期891-896,共6页

基　　金：financial support from Alberta Science and Research Authority (ASRA);University of Science and Technology Beijing (USTB);Alberta Energy Research Institute (AERI/COURSE);Syncrude Canada Ltd.

摘　　要：A new nanocrystallization process was designed, which included punching the surface coating to generate dislocation network or cells and recovery treatment to turn the dislocation cells into nano-sized grains. The effort was made to increase the service life of Nb-Ti stabilized 439M stainless steel surface with medium passive ability, particularly to enhance the outmost surface layer by nanocrystallization for improving resistances to corrosion. Electrochemical properties, electron work functions （EWFs）, nano-mechanical properties of the nanocrystallized surfaces were investigated. It was demonstrated that the nanocrystallized 439M stainless steel surface exhibited improved resistance to corrosion in 0.5 mol/L H2 SO4 solution. However, the nanoci＇ystallized 439M stainless steel surface exhibited decreased resistance to corrosion in 3.5% NaCl solution.A new nanocrystallization process was designed, which included punching the surface coating to generate dislocation network or cells and recovery treatment to turn the dislocation cells into nano-sized grains. The effort was made to increase the service life of Nb-Ti stabilized 439M stainless steel surface with medium passive ability, particularly to enhance the outmost surface layer by nanocrystallization for improving resistances to corrosion. Electrochemical properties, electron work functions （EWFs）, nano-mechanical properties of the nanocrystallized surfaces were investigated. It was demonstrated that the nanocrystallized 439M stainless steel surface exhibited improved resistance to corrosion in 0.5 mol/L H2 SO4 solution. However, the nanoci＇ystallized 439M stainless steel surface exhibited decreased resistance to corrosion in 3.5% NaCl solution.

关 键 词：NANOCRYSTALLIZATION CORROSION ferritic stainless steel PUNCHING RECOVERY 

分 类 号：TG142.71[一般工业技术—材料科学与工程]