Creep rupture behaviour of 2.25Cr-1Mo steel in sulphate-pyrosulphate mixture
01 Dec 1993-Journal of Materials Science Letters (Kluwer Academic Publishers)-Vol. 12, Iss: 24, pp 1925-1926
About: This article is published in Journal of Materials Science Letters.The article was published on 1993-12-01. It has received 1 citations till now. The article focuses on the topics: Creep.
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TL;DR: In this article, the 3SMs are responsible for the reduction in creep-rupture life and hot corrosion products found in the crack regions of the crept specimens deformed under the influence of three-salt mixtures.
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TL;DR: In this paper, a number of specific cases are discussed, the underlying principles are outlined and methods of overcoming the various problems are suggested, as well as several specific cases of accelerated corrosion are discussed.
Abstract: The increasing cost of fuel has resulted in a renewed interest in improving the efficiency of electric power generating equipment. In most cases, this involves increasing the maximum temperature in the cycle. Examples include the increase in gas turbine inlet temperatures, the increase in steam temperature and pressure in boilers and the move towards higher temperature gasification in combined-cycle plants. In all these cases, the limits are set by the properties of the available materials. Among these limiting properties, the high temperature corrosion resistance ofmetals and alloys is vel}' significant.High temperature oxidation rates set an absolute limit, but there are processes which can lead to accelerated corrosion, often associated with impurities in the fuel or air, which lower the available temperatures still further. A number of specific cases are discussed, the underlying principles are outlined and methods of overcoming the various problems are suggested.
20 citations
TL;DR: In this paper, the sulphates of these alkali metals absorb SO3, forming pyrosulphates according to the conditions of pyroclic acid and pyroxal acid.
Abstract: Corrosion of high-temperature alloys has been a problem in power plants. Ash and salts are deposited on the surface of boiler tubes in certain temperature ranges and cause accelerated corrosion of the material. Rapid corrosion is often associated with the presence of molten salts on the surface. Although spectrochemical analysis shows a number of chemical elements in the accumulated deposits, the corrosion problem is concerned mainly with the sulphates of sodium and potassium. Under suitable conditions the sulphates of these alkali metals absorb SO3, forming pyrosulphates according to
2 citations