Effect of Solution Annealing Temperature on Pitting Behavior of Duplex Stainless Steel 2204 in Chloride Solutions  

作　　者：Liang HE Yan-jun GUO Xia-yu WU Yi-ming JIANG Jin LI 

机构地区：[1]Department of Materials Science,Fudan University [2]School of Materials Engineering,Shanghai University of Engineering Science

出　　处：《Journal of Iron and Steel Research International》2016年第4期357-363,共7页

基　　金：Item Sponsored by National Natural Science Foundation of China(51131008,51371053);National Key Technology Research and Development Program of China(2012BAE04B00);Doctoral Fund of the Ministry of Education of China(20120071110013)

摘　　要：The effect of solution annealing temperature ranging from 950 to 1 200 ℃ on the microstructure and corrosion performance of duplex stainless steel （DSS） 2204 were investigated. The proportion of the ferrite phase increased while the austenite phase decreased and the ferrite stabilizing elements diluted in the ferrite phase with the increase of annealing temperature. The critical pitting temperature （CPT） of specimens annealed at 1000℃ was higher than those annealed at 950℃, whereas further increasing the annealing temperature to 1200℃ decreased the CPT. The pitting initiation sites were observed in the austenite phase, at the boundary of ferrite/austenite phase and inside the ferrite phase for specimens annealed at 950, 1000℃ and exceeding 1 100℃, respectively. The evolution trend of the CPT and the pit initiation site were analyzed by the pitting resistance equivalent number.The effect of solution annealing temperature ranging from 950 to 1 200 ℃ on the microstructure and corrosion performance of duplex stainless steel （DSS） 2204 were investigated. The proportion of the ferrite phase increased while the austenite phase decreased and the ferrite stabilizing elements diluted in the ferrite phase with the increase of annealing temperature. The critical pitting temperature （CPT） of specimens annealed at 1000℃ was higher than those annealed at 950℃, whereas further increasing the annealing temperature to 1200℃ decreased the CPT. The pitting initiation sites were observed in the austenite phase, at the boundary of ferrite/austenite phase and inside the ferrite phase for specimens annealed at 950, 1000℃ and exceeding 1 100℃, respectively. The evolution trend of the CPT and the pit initiation site were analyzed by the pitting resistance equivalent number.

关 键 词：duplex stainless steel pitting corrosion solution annealing treatment critical pitting temperature 

分 类 号：TG161[金属学及工艺—热处理] TG142.71[金属学及工艺—金属学]