Investigation of the metal dusting attack on the temperature range 500−700 °C using X-ray tomography. (November 2021)

• Record Type: Journal Article
• Authors: Mathieu, S.; Le Pivaingt, L.; Ferry, O.; Vilasi, M.; Stuppfler, A.; Guichard, J-L.; Vande Put, A.; Monceau, D.
• Is Part Of: Corrosion science. Volume 192(2021)
• Publication Date: 2021-11
• Subjects: A. Alloy -- B. Mass loss -- C. Oxidation -- C. Carburization; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2021.109863
• Languages: English
• ISSNs: 0010-938X

Abstract

Abstract: A test rig consisting of a quartz tube placed in a horizontal furnace made of five independently regulated heating zones allowed the evaluation of the metal dusting attack of a FeNiCr alloy. Fifteen samples were exposed in a temperature gradient from 504° to 704°C, 1.1 bar, to a highly carburizing atmosphere for 1500 h. Below 561 °C the high density of pits led to uniform corrosion whereas localized pits developed at higher temperatures. In depth pit growth rate raised to a maximum at 632 °C, then decreased showing that it depends both on temperature and on the carbon activity gradient. Highlights: The CT15C resistance to metal dusting attack was studied in a temperature gradient. All specimens suffered from MD attack by pitting from 504° to 704°C, at 1.1 bar. The high pits density below 561 °C turned eventually to a uniform corrosion. In depth pit growth rate raised to a maximum at 632 °C, then decreased. Mass loss measurements were found inadequate to evaluate metal dusting wastage.