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Influence of Decarburization on the Erosion and Corrosion Resistance of a High Chromium Cast Iron
In this paper, we present a case study that illustrates the detrimental effects decarburization has on the resistance of high chromium cast iron to erosion and corrosion. Two samples are analysed: the first was extracted from a heat-treated impeller used for phosphoric acid slurry pumping. This resulted in decarburization and a gradual change in microstructure from the surface to the core of the material where zones closer to the surface not only had a smaller CVF (Carbide Volume Fraction) but formed a continuous carbide network which facilitated cracking propagation. This led to a significant drop in surface hardness. The second sample was extracted from an unused, non-treated pump made using a similar chemical composition to the failed impeller. This sample had a microstructure that is uniform across its regions. Samples were subjected to corrosion testing in a phosphoric acid solution at 80 ℃, and then cleaned and eroded using a sand jet impingement erosion tester, and corrosion-tested again in the same conditions. A comparison is made each time between the mass losses and polarization curves of the samples as well as a microstructural analysis of their cross-sections to evaluate the erosion and corrosion resistance of the high chromium cast irons at their two different states.
Influence of Decarburization on the Erosion and Corrosion Resistance of a High Chromium Cast Iron
In this paper, we present a case study that illustrates the detrimental effects decarburization has on the resistance of high chromium cast iron to erosion and corrosion. Two samples are analysed: the first was extracted from a heat-treated impeller used for phosphoric acid slurry pumping. This resulted in decarburization and a gradual change in microstructure from the surface to the core of the material where zones closer to the surface not only had a smaller CVF (Carbide Volume Fraction) but formed a continuous carbide network which facilitated cracking propagation. This led to a significant drop in surface hardness. The second sample was extracted from an unused, non-treated pump made using a similar chemical composition to the failed impeller. This sample had a microstructure that is uniform across its regions. Samples were subjected to corrosion testing in a phosphoric acid solution at 80 ℃, and then cleaned and eroded using a sand jet impingement erosion tester, and corrosion-tested again in the same conditions. A comparison is made each time between the mass losses and polarization curves of the samples as well as a microstructural analysis of their cross-sections to evaluate the erosion and corrosion resistance of the high chromium cast irons at their two different states.
Influence of Decarburization on the Erosion and Corrosion Resistance of a High Chromium Cast Iron
Lecture Notes in Civil Engineering
Capozucca, Roberto (editor) / Khatir, Samir (editor) / Milani, Gabriele (editor) / Adnane, ElJersifi (author) / Abdelouahed, Chbihi (author) / Nawal, Semlal (author) / Hassan, Bouaouine (author) / Sanae, Naamane (author)
International Conference of Steel and Composite for Engineering Structures ; 2022 ; Ancona, Italy
Proceedings of the International Conference of Steel and Composite for Engineering Structures ; Chapter: 11 ; 138-148
2023-01-31
11 pages
Article/Chapter (Book)
Electronic Resource
English
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