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Corrosion behavior of cold-rolled and post heat-treated 316L stainless steel in 0.9wt%NaCl solution

查看全文 作　　者：K.Bin [1]Tayyab;[1]A.Farooq;A.Ahmed [1]Alvi;A.Basit [1]Nadeem;[1,2]K.M.Deen 高影响力作者 机构地区：[1]Corrosion Control Research Cell,Department of Metallurgy and Materials Engineering,University of the Punjab,Lahore,Pakistan;[2]Department of Materials Engineering,The University of British Columbia,Vancouver,V6T 1Z4,BC,Canada高影响力机构 出　　处：《International Journal of Minerals,Metallurgy and Materials》索引2021年第28卷第3期,共10页高影响力期刊 摘　　要：The effect of cold rolling and post-rolling heat treatment on the microstructural and electrochemical properties of the 316L stainless steel was investigated.Two-pass and four-pass cold-rolled stainless steel specimens were heat-treated by annealing at 900℃followed by quenching in water.During the cold rolling,the microstructure of the as-received specimen transformed from austenite to strain-inducedα′-martensite due to significant plastic deformation that also resulted in significant grain elongation(i.e.,~33%and 223%increases in the grain elongation after two and four rolling passes,respectively).The hardness of the heat-treated as-received specimen decreased from HV 190 to 146 due to the recovery and recrystallization of the austenite grain structure.The cyclic polarization scans of the as-rolled and heat-treated specimens were obtained in 0.9wt%NaCl solution.The pitting potential of the four-pass rolled specimen was significantly increased from 322.3 to 930.5 mV after post-rolling heat treatment.The beneficial effect of the heat treatment process was evident from~10-times-lower corrosion current density and two-orders-of-magnitude-lower passive current density of the heat-treated specimens compared with those of the as-rolled specimens.Similarly,appreciably lower corrosion rate(3.302×10^(−4)mm/a)and higher pitting resistance(1115.5 mV)were exhibited by the postrolled heat-treated specimens compared with the as-rolled 316L stainless steel specimens. 关 键 词：cold rolling QUENCHING cyclic polarization re-passivation tendency
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