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MICROSTRUCTURE CHANGES DURING CREEP DEFORMATION OF G 20Mo5 STEEL
Abstract
Creep damage of pressure equipment invol ves a great variety of high temperature components ranging from superheaters, bo iler drums, furnaces, reactors, etc. Consequences of failures of these components are of high economic and safety concern. Moreover, the probability of failure of high temperature components is now increasing due to frequent cyclic of power plants im posed by a deregulated market and the search for increasing temperatures in ultra supercritical plants. A housing from high-pressure steam turbine in power plant is projected in order to meet construction period 100000-200000 of operating hour. Housing is produced by casting. Such after long-term servicing, the surface layer at housing is changed under the influence of pressure and temperature in creeping conditions. For improve the evaluation precision of creep damage of steam turbine casings at thermal power plants, the microstructures of casing materials are examined. NDT during service are a fundame ntal tool for residual life assessment as well. The material from cast housing is observed me tallographically by means of the replica technique. In this paper is presented an evaluation of microstructure the housing high- pressure steam turbine castings in viewing into the microstructure changes, according to the recommendations of the European Commission, using light microscopy. The paper also includes a short description of the replica method.
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