Communications - Scientific Letters of the University of Zilina 2010, 12(4):20-26 | DOI: 10.26552/com.C.2010.4.20-26

Influence of Secondary Phase Precipitation on Resistance to Intergranular Corrosion of AiSi 316l Austenitic Stainless Steel

Katarina Bartova1, Maria Domankova2, Jozef Janovec2
1 Institute of Materials Science, Faculty of Materials Science and Technology in Trnava
2 Slovak University of Technology in Bratislava, Slovakia

The AISI 316L steel after cold working of 40% and subsequent annealing at 750°C for 1, 2, 5, 10, 50, or 100 h was investigated. For the microstructure characterization the light microscopy and the transmission electron microscopy were used. To determine the sensitivity to intergranular corrosion the test was performed according to ASTM A 262, practice A. The transition between non-sensitised and sensitised states was found to be between 1 and 2 h of annealing. Sigma, laves and chi phases were identified in all the analyzed conditions. M23C6 was found to start to precipitate between 5 and 10 h of annealing. Sigma, chi, and M23C6 precipitated mainly along the grain boundaries. Laves precipitated mainly inside the grains, and after 50 h of annealing also intergranularly. Time dependent changes in the average metal composition of particular phases were considered as negligible.

Keywords: austenitic stainless steel, intergranular corrosion, secondary phase precipitation, transmission electron microscopy

Published: December 31, 2010  Show citation

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Bartova, K., Domankova, M., & Janovec, J. (2010). Influence of Secondary Phase Precipitation on Resistance to Intergranular Corrosion of AiSi 316l Austenitic Stainless Steel. Communications - Scientific Letters of the University of Zilina, 12(4), 20-26. doi: 10.26552/com.C.2010.4.20-26
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