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Meeting 2017 TMS Annual Meeting & Exhibition
Symposium Energy Materials 2017: Materials for Gas Turbines
Presentation Title Development Activities for the Manufacture of Rotor Forgings for Turbines in High Efficiency Power Plants
Author(s) Nikolaus Robert Raimar Blaes, B. Donth, Andreas Diwo, D. Bokelmann, M. Baues
On-Site Speaker (Planned) Nikolaus Robert Raimar Blaes
Abstract Scope Boron containing steel COST FB2 designed for operational steam temperatures up to 620C has found increasing industrial application in high efficiency turbines. Currently several development programs are going to further increase the steam temperature beyond 700C. To achieve higher temperatures with steel forgings not only sufficient creep strength has to be achieved, but resistance against steam oxidation has to be improved by increase of Cr content. In the past all attempts to develop stable creep resistant martensitic 11-12% Cr steels for up to 650C failed due to breakdown in long-term creep strength. Therefore the European project “Z-Ultra” was launched for development and manufacture of a new alloy type replacing in the steel matrix nitride strengthening particles by fine precipitations of the more stable Z-phase. Saarschmiede participates in this project and contributed amongst others by manufacturing a full scale turbine part. Production experience and test results are presented. Steam temperatures of about 700C can only be achieved by using Ni-base material in the hottest part of the turbine. In previous R&D projects solid solution hardening Alloy 617 proved to be a most promising candidate alloys. For temperatures in the range of 750C only g‘-precipitation hardened nickel base alloys can be applied. In Europe “NextGenPower” project was funded by the European Commission, where one of the main goals was to develop turbine rotor materials and to demonstrate manufacturability of forgings for full scale turbine rotor parts for that steam temperature range. Contributing to this project, Saarschmiede has produced a large rotor forging from well known Alloy 263 with a diameter of 1000 mm, which is the first worldwide of that size. Experiences in manufacture and test results are presented.
Proceedings Inclusion? Planned: Stand-alone book in which only your symposium’s papers would appear (indicate title in comments section below)

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Advanced Characterization of the Hot Corrosion Behavior of Gas Turbine Alloys under Burner Rig Test Exposures
Alloy Development for Promoting γ/γ' Microstructural Stability and Creep Properties of Multi-component Co-base Superalloys
C-11: Effect of Thermal Debinding and Sintering Conditions on Mechanical Properties of Silica-based Ceramic Cores
C-12: Microstructures and Deposition Mechanisms of Thermal Barrier Coatings Produced by PS-PVD
C-13: Mullitization of Fused Silica on Silica-based Ceramic Cores by Colloidal Alumina Infiltration
C-14: Solidification Behavior and Microstructure of Inconel 625 Superalloy under Electromagnetic Field
C-15: Study on the Undercoolability and Single Crystal Castability of Nickel-Based Superalloys
C-16: Temperature Dependence of the Fracture Behavior of X-750 Alloy and Effect of Heat Treatment
Deposit-Induced Hot Corrosion and Materials Design Strategies to Reduce Its Impact
Development Activities for the Manufacture of Rotor Forgings for Turbines in High Efficiency Power Plants
Development of a New High Strength and Hot Corrosion Resistant Directionally Solidified Superalloy DZ409
Development of High Strength Hot Corrosion Resistant Single Crystal Superalloys Based on Understanding the Effect of Key Elements on Hot Corrosion Behavior
Effect of Alloying Elements (Cr and Al) in Nickel-based Alloys in Molten Sulfate Environments
Effect of C Addition on Creep and Microstructure Stability of Lamellar TiAl Alloys
Efforts to Introduce TiAl Alloys for Gas Turbine Applications
Electrodeposited MCrAlY Coatings for Gas Turbine Engine Applications
Evolution of the Thermal Conductivity of Sm2Zr2O7 under CMAS Attack
Grain Refinement of Cast FeAl-Alloys for Gas Turbine Blades
Mechanisms of Fracture in Laser Powder Bed Additive Manufactured Superalloys
Microstructures and Mechanical Properties of Ultrafine Grained Ni Based Superalloy Matrix Nanocomposites Fabricated by Powder Metallurgy Route
Modeling the Diffusion of Minor Elements in Different MCrAlY – Superalloy Substrates at High Temperature
Multilayered, Multifunctional Thermal Barrier Coatings for Gas Turbine Engines
On Healing Mechanism of Cast Porosities in Cast Ni-Based Superalloy by Hot Isostatic Pressing
Porous Yttria-stabilized Zirconia Microspheres for Advanced Reflective Thermal Barrier Coatings
Rafting Prediction Criterion and Creep Life for Nickel-based Single Crystal Superalloys under Multiaxial Stress States
Rejuvenation of a Co Based Superalloy to Prevent the Quickest Microstructural Degradation during the Following Operating Cycle
Rejuvenation Process Definition for IN792SX Gas Turbine Blades Aimed to Extend Their Expected Life
Revisiting the Sources of Creep Dislocations in Ni-base, Single Crystal Superalloys
Simulation of Precipitation Behavior of Nickel-based Superalloys
Tensile Behavior of Inconel X-750: Effect of Heat Treatment
The Effect of Superalloy and Coating Composition and Specimen Geometry on TBC Lifetime
The Influence of Dendritic Segregation Degree to the Recrystallization Nucleation in U4720LI
The Materials, Manufacturing and Equipments of the Large Disk Forgings for Industrial Gas Turbines
Thermal Barrier Coatings for More Efficient Gas-Turbine Engines
Wang: High Temperature Oxidation of the New Type γ'-strengthened Cobalt-base Superalloys

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