Mots-clé
(Allemand)
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Materials; Development; Steam; Turbine; Boiler
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Programme de recherche
(Anglais)
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COST-Action 536 - Alloy development for Critical Components of Environmental friendly Power planT (ACCEPT)
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Description succincte
(Anglais)
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The main objec tive of the action is to develop highly efficient steam power plant with low emissions, through three development steps, on the nano-scale, the meso-scale and the macro-scale, from innovative alloy development to validation of component integrity.The Action will develop, qualify and introduce improved materials of the 9 to 12%Cr class with improved high temperature strength for the manufacture of critical components required for the fabrication of advanced steam power plants. Specifically materials are to be introduced for heavy forgings (such as for turbine rotors), castings (such as casings for turbines and valves) and thick-walled pipes (such as for headers and main steam pipes). The process of introduction entails the following steps: - alloy design on the basis of computer-aided phase stability predictions validated by investigations of model alloys, - production and investigations of promising novel alloys to evaluate their fitness for the application, - manufacture of larger melts to verify the scale-up to sizes appropriate for full industrial exploitation.
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Partenaires et organisations internationales
(Anglais)
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AT, BE, CH, CZ, DE, DK, ES, FI, Hu, IT, NL, PL, SE, SK, UK
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Résumé des résultats (Abstract)
(Anglais)
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The project is aimed at the development and qualification of improved 9 to 12%Cr steels with higher temperature capability for use in high-temperature high-efficiency steam power plant. The project is organised in 6 parallel working groups: Alloy design, Forgings, Castings, Welding, Boiler Materials and Steam Oxidation. The following have been the key activities and achievements in each group: - Alloy Design: Improvement of simulation programmes able to predict the stability of Z phase and recommendation of chemical compositions expected to provide improved creep strength - Forgings: Manufacture of large forgings of steels with improved balance of B and N contents. Me-chanical testing ongoing. - Castings: A similar alloying concept has been used for improved castings and manufacturing is in progress - Welding: Similar and dissimilar welds have been made between the cast steel CB2 and the pipe steel P92 using different welding consumables. Mechanical testing will be started shortly. - Boiler Materials: A boron-containing steel has been used for the manufacture of large thick-walled pipes (PB2). Alternatives with higher boron content and modified N level (PB2-2) will be manufac-tured. A steel with high Co and W contents appears not to form a type VI zone, so that improved creep properties are expected. In each case the creep strength will be determined (expected to be better than the current best steel, P92). - Steam oxidation: Rates of steam oxidation and spalling have been determined in different labora-tories under different conditions (steel composition, coatings, surface treatments, temperature, flow rate, etc.). Meetings have been held for all working groups on 21st to 23rd March 2007 in Baden, Switzerland, on 30th October 2007 in Vienna, Austria and most recently on 9th to 11th April 2008 in Bergamo, It-aly. A summer school has been organised to disseminate information from the COST 536 Action and generate interest in a new activity. Since the action finishes in June 2009, activities have been started to prepare a new project which will be aimed at 'Engineered Microstructures for Enhanced long term high temperature materials Performance'. For this purpose a meeting of work package co-ordinators and experts was held in Düsseldorf on 26th May 2008. A draft proposal has been formulated for distribution to interested parties. Most recent minutes of management committee meeting on 11th April 2008 and general minutes of meeting from 9th to 11th April 2008 in Bergamo, Italy, are included with the paper version.
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Références bases de données
(Anglais)
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Swiss Database: COST-DB of the State Secretariat for Education and Research Hallwylstrasse 4 CH-3003 Berne, Switzerland Tel. +41 31 322 74 82 Swiss Project-Number: C04.0184
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