Intergranular corrosion of AISI 316L steel

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• 作者：Matula ; Martin ; Hyspecka ; Ludmila ; Svoboda ; Milan ; Vodarek ; Vlastimil ; Dagbert ; Catherine ; et. al.
• 关键词：Austenitic stainless steel AISI 316L ; Degree of sensitization to intergranular corrosion ; Carbide precipitation ; Chromium-depleted zones ; SL-EPR and DL-EPR tests ; Oxalic acid etch test (ASTM A 262-A) ; Quantitative metallography ; Statistical normalization
• 刊名：Materials Characterization
• 出版年：2001
• 期刊代码：57_10445803
• 类别：ms
• 出版时间：February - March, 2001
• 卷：46
• 期：2-3
• 页码：203-210
• 文件大小：541 K

摘要

The degree of sensitization (DOS) of austenitic stainless steel AISI 316L to intergranular corrosion (IGC) was determined by means of electrolytic etching in oxalic acid and electrochemical potentiokinetic reactivation (EPR) tests completed by metallographic inspection. An analytical electron microscope, equipped with an energy-dispersive X-ray spectrometer, was used to examine the microstructure of the steel investigated, which had been annealed for 3.60×10⁴ to 1.91×10⁷ s at a temperature of 650°C. The kinetics of precipitation of secondary phases (M₂₃C₆ carbides, Laves phase Fe₂Mo) were studied by means of quantitative metallography. The volume fractions of chromium-rich M₂₃C₆ carbides along grain boundaries and Laves phase Fe₂Mo in the matrix were determined. Chromium concentration profile measurements across the grain boundary, in the vicinity of M₂₃C₆ carbides, have been performed using the analytical electron microscope. All results concerning microstructural changes were quantitatively related to the IGC characteristics by statistical normalization.