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Kinetics of Cr 2 N Precipitation and Its Effect on Pitting Corrosion of Nickel-Free High-Nitrogen Austenitic Stainless Steel
Journal of Materials Engineering and Performance ( IF 2.3 ) Pub Date : 2020-09-11 , DOI: 10.1007/s11665-020-05098-w
K. Krishna Kumar , J. Anburaj , R. Dhanasekar , T. Satishkumar , J. Abuthakir , P. Manikandan , R. Subramanian

In the present work, hot-rolled nickel-free high-nitrogen austenitic stainless steels (HNSS) were solution annealed and aged at 700, 800 and 900 °C for 14 h. Precipitation behavior of Cr2N at the grain boundaries (GB) of HNSS was studied using TC-PRISMA simulation and TEM analysis. Pitting corrosion behavior of HNSS at solution annealed and aged conditions were studied using cyclic polarization and electrochemical impedance spectroscopy (EIS) analysis. TC-PRISMA simulation results showed that equal volume fraction of chromium nitride (Cr2N) precipitates was observed in GBs of austenite in all three aging conditions. However, large size precipitates were observed in samples aged at 900 °C compared to samples aged at 700 and 800 °C. TEM investigations showed the presence of discrete needle like Cr2N precipitates at the GBs and coarse lamellar austenite in regions adjoining the GBs in samples aged at 700 °C aging temperature. Disk-type Cr2N precipitates were observed in GBs of austenite in 900 °C aging temperature. Besides, sample aged at 900 °C exhibited relatively higher repassivation behavior compared to solution annealed and samples aged at 700 and 800 °C.



中文翻译:

Cr 2 N析出动力学及其对无镍高氮奥氏体不锈钢点蚀的影响

在目前的工作中,对热轧的无镍高氮奥氏体不锈钢(HNSS)进行固溶退火,并在700、800和900℃时效14小时。利用TC-PRISMA模拟和TEM分析研究了HNSS中Cr 2 N在晶界(GB)上的析出行为。使用循环极化和电化学阻抗谱(EIS)分析研究了HNSS在溶液退火和时效条件下的点腐蚀行为。TC-PRISMA模拟结果表明氮化铬(Cr 2在所有三个时效条件下,在GB的奥氏体中均观察到N)沉淀。但是,与在700和800°C下老化的样品相比,在900°C下老化的样品中观察到大尺寸的沉淀物。TEM研究表明,在700°C时效温度下老化的样品中,GBs和与GBs相邻的区域中存在离散的针状Cr 2 N析出物,以及粗大的层状奥氏体。在900°C的时效温度下,在GBs的奥氏体中观察到圆盘型Cr 2 N沉淀。此外,与固溶退火以及在700和800°C时效的样品相比,在900°C时效的样品表现出相对较高的再钝化行为。

更新日期:2020-09-12
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