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High temperature steam oxidation of power plant alloys by means of a new specimen design with contacting surfaces.

Piedra Gonzalez, E M*; Fry, A T (2012) High temperature steam oxidation of power plant alloys by means of a new specimen design with contacting surfaces. Oxid. Met., 77 (3-4). pp. 189-207.

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Concerns about the emissions of CO2 and other greenhouse gases into the atmosphere have been growing due to the development of the global power generation industry, this research is focused on the effort in reducing CO2 emissions by increasing the efficiency of powers plants. In industrial plants the degradation of contacting surfaces under severe conditions can cause the failure of a component or the damage of other areas around by spallation of the oxide scales. To control this process and assess the problem some material combinations were tested under contacting steam oxidation conditions. Different 9 %Cr ferritic-matensitic steel and Ni based alloys were placed in contact through a new type of specimen design (pin-collar), which allows the measurement of the cohesive strength of the oxides formed. Exposure tests were carried out in a tube furnace with a flowing steam environment at temperatures between 650 and 750 °C and times from 500 to 3000 hours. The adhesion of the oxide/oxide interfaces was measured later in a tensile test machine. Mechanical test results show the relationship between the oxide growth and the increased movement restriction of both halves of the sample. After the tests optical and SEM analysis were performed on the cross sections of the failure surfaces. It was observed that in those combinations of materials where the ferritic-martensitic steel is involved, it is possible to have two oxide fronts growing into each other to form one monolithic oxide scale. This type of test was found to be less suitable to evaluate the properties between two Ni based alloy surfaces in contact.

Item Type: Article
Keywords: High temperature corrosion, steam oxidation, Ni based alloy, ferritic-martensitic steel, contacting surfaces, tensile, power plant
Subjects: Advanced Materials
Advanced Materials > Corrosion
Identification number/DOI: 10.1007/s11085-011-9280-4
Last Modified: 02 Feb 2018 13:14
URI: http://eprintspublications.npl.co.uk/id/eprint/5387

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