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Meeting 2017 TMS Annual Meeting & Exhibition
Symposium Energy Materials 2017: Materials for Gas Turbines
Presentation Title On Healing Mechanism of Cast Porosities in Cast Ni-Based Superalloy by Hot Isostatic Pressing
Author(s) Yuan Chao, Li Jie, Kai-Xin Dong, Guo Jianting
On-Site Speaker (Planned) Yuan Chao
Abstract Scope The purpose of this study is to evaluate the effects of hot isostatic pressing (HIP) on the porosity healing and the microstructure evolution of a cast superalloy K452, which is generally applied for fabrication the vanes with the bigger size. The annihilation degree of the porosity, related to the location and shape of the porosity as well as HIP temperature, were studied by high resolution transmission X-ray tomography (HRTXRT) and finite element method (FEM). Results showed that the most of porosities (over 80 %) were eliminated by HIP at 1200 oC, in which the porosity located in the thin walled parts and with the loose-flat shape was easy to be healed, and the diameter of remnant porosities was decreased to less than 10 m. Accordingly, A healing mode of the porosity was established. .Furthermore, It was found that the slow cooling rate during HIP would obviously lead γ′ precipitates to coarsen, while the rejuvenation heat-treatment (RHT) after HIP could reduce the dendritic segregation degree and readjust the coarsen γ′ precipitates, which finally improved the mechanical properties of the cast superalloy. The HIPed K452 alloy vanes have been successfully used in a civil gas turbine.
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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