The corrosion resistance under elevated temperature of additively manufactured 316L stainless steel made by directed energy deposition was studied. Test samples were prepared in a hybrid additive manufacturing machine using standard deposition parameters recommended by the manufacturer. Control samples were cut from wrought material to compare the results. The test was performed under a corrosive atmosphere with a solution of water with 3.5 % in weight of salt (NaCl). The total duration of the test was 635 hours, divided in five stages of 12, 24, 48, 226, and 325 hours to analyze the samples between each stage. The samples were analyzed quantitatively measuring weight loss and surface topography, and qualitatively by macroscopic inspection with digital photography, and microscopic inspection with optical and scanning electron microscopy. The results show a higher corrosion rate for the additively manufactured samples compared to the control samples. An evident increase in the size of pits initially present on the samples was observed and quantified on the additively manufactured. Although the additively manufactured samples were more aggressively attacked by corrosion, they still presented a shiny surface finish at the end of the test, reinforcing the idea of the formation of a passive oxide layer and suggesting that the corrosion was focalized in the surface defects by pitting and crevice corrosion mechanisms.
Identifer | oai:union.ndltd.org:unt.edu/info:ark/67531/metadc1873620 |
Date | 12 1900 |
Creators | Canales Cantu, Alberto Alejandro |
Contributors | Siller, Hector R., Nasrazadani, Seifollah, Bostanci, Huseyin, Mirshams, Reza |
Publisher | University of North Texas |
Source Sets | University of North Texas |
Language | English |
Detected Language | English |
Type | Thesis or Dissertation |
Format | viii, 45 pages, Text |
Rights | Public, Canales Cantu, Alberto Alejandro, Copyright, Copyright is held by the author, unless otherwise noted. All rights Reserved. |
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