MANDATE: Manufacture of dual alloy turbine engine disks

• Research unit: EU RFP
• Project number: 97.0492

Key words (English)

High temperature; gas turbine disk; bimetallic joint; Udimet 720; Inconel IN738LC; nondestructive evaluation

Alternative project number (English)

EU project number: BRPR-CT98-0690

Research programs (English)

EU-programme: 4. Frame Research Programme - 2.1 Industrial and materials technologies

Short description (English)

See abstract

Further information (English)

Full name of research-institution/enterprise:
Eidg. Materialprüfungs- und Forschungsanstalt EMPA
Leiter ZfP Sonderverfahren

Partners and International Organizations (English)

Coordinator: EGT Mechanical Engineering Centre (UK)

Abstract (English)

THE FOCUS OF THE PROGRAMME IS ON GAS TURBINE DSKS. THE TECHNOLOGY WILL BE GENERIC TO PROVIDES MANUFACTURING ROUTES AND A VERTIFIED LIFING MODEL FOR THE DESIGN OF BONDED BI-METALLIC (DUAL ALLOY) COMPONENTS SUBJECTED TO VARIABLE LOADING CONDITIONS. THE CONCEPT OF BI-METALLIC GAS TURBINE DISK ENABLES THE DIFFERENT MECHANICAL PROPERTY REQUIREMENTS OF THE HUB REGION (TENSILE STRENGTH AND LOW CYCLE FATIGUE RESISTANCE) AND THE RIM REGION (CREEP AND HIGH CYCLE FATIGUE RESISTANCE). THEREFORE BI-METALLIC, DUAL ALLOY GAS TURBINE DISKS OFFER CONSIDERABLE ADVANTAGES OVER THEIR MONO-ALLOY COUNTERPARTS IN THERM OF HIGER TEMPERATURE AND LARGER SIZE CAPABILITIES, ALLOWING SUBSTANTIAL POWER AND EFFICIENCY GAINS, AND REDUCED EMISSIONS.
THE OBJECTIVES OF THE MANDATE PROJECT ARE:
- TO DEVELOP THE MANUFACTURING TECHNOLOGY FOR FULL-SCALE COMPONENTS, DEMONSTRATING THE ABILITY OF EXISTING JOINING AND POST-MANUFACTURING TECHNIQUES TO REALIZE A DEFINIED BI-METALLIC DISK STRUCTURE, AND TO ENGINEER THESE FURTHER BASED ON RELIABILITY AND ECONOMY CONSIDERATIONS
- TO SET UP A ROUTE OF VALIDATED QUALIFICATION AND NDT INSPECTION PROCEDURES FOR DUAL ALLOY BI-METALLIC DISKS
- TO VALIDATE LIFE PREDICTION METHODOLOGIES FOR DUAL ALLOY BI-METALLIC DISKS BY DISK SPIN TESTING
NONDESTRUCTIVE EVALUATION METHODS HAVE BEEN DEVELOPED BY EMPA FOR DETECTION OF THE CRITICAL DEFECTS IN THE BI-METALLIC JOINT AND DUAL ALLOY DISK.
THE MICROSTRUCTURE OF THE BI-METALLIC JOINT HAS BEEN CHARACTERISED IN THERMS OF CHEMICAL AND STRUCTURAL FEATURES OF THE INTERFACE BY EMPA. ATTENTION HAS BEEN PAID TO THE PRECIPITATES (COMPOSITION, MORPHOLOGY AND SPATIAL DISTRIBUTION) INCLUDING CARBIDES, g ' SIZE AND THE MECHANICAL BEHAVIOUR OF THE ELEMENTS CONSIDERED.

References in databases (English)

Swiss Database: Euro-DB of the
State Secretariat for Education and Research
Hallwylstrasse 4
CH-3003 Berne, Switzerland
Tel. [phone]
Swiss Project-Number: 97.0492