Mass transfer and morphological changes in AISI 316 stainless steel in high temperature flowing sodium

Effect of flowing sodium on corrosion and tensile properties of AISI type 316LN stainless steel at 823K

“…3(c) and (d)). This layer was similar to the one observed in sodium exposed 316 stainless steel [19]. However, the depth of degraded layer in type 316 stainless steel was around 15 lm.…”

“…Table 3 gives the surface carburization values as a function of distance for type 316 LN stainless steel exposed to sodium. In type 316 stainless steel, carbon concentration had attained a maximum of 0.135 wt% at a depth of 43 lm [14] and equaled the bulk concentration at a distance of 74 lm from the surface. In type 316LN stainless steel, the peak concentration of carbon was attained at 10 lm, immediately after the end of the degraded layer, while the bulk concentration was attained at a distance of 38 lm.…”

“…The changes in microstructure and tensile properties on exposure of type 316 stainless steel to flowing sodium at 823 K for 16 000 h have been investigated and reported [19]. In the present paper, changes in microstructure, carburization and their influence on the tensile properties of type 316LN stainless steel are discussed and compared with the results of type 316 stainless steel, the analysis of which was carried out earlier.…”

“…The most commonly encountered corrosion product in sodium containing less than 10 ppm oxygen is NaCrO 2 [3][4][5]. The transfer of elements from structural materials by liquid sodium is reported to influence the corrosion and mechanical properties [6][7][8][9][10][11][12][13][14].…”

Evaluation of Microstructural, Mechanical Properties and Corrosion Behavior of AISI Type 316LN Stainless Steel and Modified 9Cr-1Mo Steel Exposed in a Dynamic Bimetallic Sodium Loop at 798 K (525 °C) for 16,000 Hours

“…[29] This value was a hundred times higher than the value of carbon activity reported (~0.001) in Fe-18Cr-8Ni austenitic stainless steel containing 0.04 pct carbon. [30] Hence, in Indian sodium containing 25 ppm carbon, of which 2 ppm is in solution, carbon activity would be much higher than in type 316LN austenitic stainless steel containing 0.03 wt pct carbon. [31] A comparison of Figures 5(b) and (c) suggested that the carbon diffusing into type 316LN stainless steel caused extensive precipitation of M 23 C 6 carbides.…”