Annual Report 2003-2004

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Chemistry & Materials Research CenterNRIProject Results: Providing know- how of manufactuning process of grain – oriented silicon steelsheets. Determining the effect of silicon steel magnetic properties on power losses ofelectrical machines.Project Documentation:- Metallurgy Department; Report of “Study and evaluation of various kinds ofsilicon steel sheets used in transformers cores and their properties”; Chemistry &Materials Research Center; NRI; April 1998.- Metallurgy Department; Report of “Feasibility study for purchasing semiprocessedsilicon steel sheets from foreign manufacturers”; Chemistry & MaterialsResearch Center; NRI; April 1998.- Metallurgy Department; Report of “Investigation of decarburization annealingprocess for silicon steel sheets”; Chemistry & Materials Research Center; NRI; July1998.- Metallurgy Department; Report of “Investigation of coating process for siliconsteel sheets”; Chemistry & Materials Research Center; NRI; March 1999.- Metallurgy Department; Report of “Determination and providing standards andprocedures for quality control of silicon steel sheets”; Chemistry & Materials ResearchCenter; NRI; April 1999.- Metallurgy Department; Report of “Initial conclusions and determination of properflowcharts for developing manufacturing process of silicon steel sheets”; Chemistry &Materials Research Center; NRI; April 1999.- Metallurgy Department; Report of “Mesearment and determination ofmetallurgical, mechanical and physical properties of silicon steel sheets”; Chemistry &Materials Research Center; NRI; Aug. 2000.- Metallurgy Department; Report of “Decarburization annealing of silicon steelsheets and optimization of this procedure for grain oriented grades”; Chemistry &Materials Research Center; NRI; Jan. 2001.- Metallurgy Department; Report of “Coating of silicon steel sheets andoptimization of this procedure for grain oriented grades”; Chemistry & MaterialsResearch Center; NRI; Jan. 2001.- Metallurgy Department; Report of “Final annealing of silicon steel sheets andoptimization of this procedure for grain oriented grades”; Chemistry & MaterialsResearch Center; NRI; July 2003.- Metallurgy Department; Report of “Quality control of manufactured silicon steelsheets and comparison with imported standard samples”; Chemistry & MaterialsResearch Center; NRI; Feb. 2003.- Metallurgy Department; Report of “Final conclusions and providing know-how ofmanufacturing process of grain oriented silicon steel sheets”; Chemistry & MaterialsResearch Center; NRI; Feb. 2003.114
NRIChemistry & Materials Research CenterProject Title:Determination of Optimum Coatings for GE-F5, TG20 andMW701B Gas Turbine Blades in Rey Power PlantDepartment: MetallurgyProject Manager: D. RezakhaniEmployer: Tehran Regional Electric Co. Project Code: PMTBT01Project Staff: A.A. Zhaam, M. Hirbod, A. Saboor, M. Alibabai, M.M. Khajavi,S. Ahangarani, A. Pasha, M. Ferdoosi, S. AfroukhtehSummary:First – stages of gas turbine blades are subject to severe thermomechanical cycles andoperate in corrosive environments that depend on the conditions of use. Protectivecoatings are required for turbine blades to provide resistance against oxidation and hotcorrosion. Development of corrosion–resistant coatings have led to a great variety ofcoatings, which include diffusion coatings, MCrAlY overlay coatings and ceramicthermal barrier coatings. Application techniques commonly used include packcementation, electron-beam physical vapor deposition and plasma spray. The operatingconditions, fuel type and its composition, inlet air Mechanical, mechanical design and… play important roles in selection of protective coatings for gas turbine blades.However, coating protection effects are manifested only if the coating has been chosencorrectly, both in terms of blade design and engine running conditions.In this project, the currently available coatings types and coating processes are studied.A list of commercially available, non-proprietary coatings are compiled based oninformation provided by major coating suppliers. The applicability and fieldperformance of the various available coatings with respect to corrosive environment,temperature, substrate alloy and turbine operation are studied in order to assist in theselection of coatings for specific applications. Finally as a case study, failure analysis ofcoatings on GE-F5, TG20 and MW701B gas turbine blades in Rey power plant areperformed and the mechanisms of failure, are recognized. Therefore optimum coatingsare determined and quality control procedures and inspection techniques for the selectedcoating types and processes are also discussed.115
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Annual Report 2003-2004

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