A5027401502- High Temperature Alloys and Creep
- High-Temperature Coating Behaviors
- Additive Manufacturing Materials and Processes
- Intermetallics and Advanced Alloy Properties
- High Entropy Alloys Studies
- Microstructure and Mechanical Properties of Steels
- Fatigue and fracture mechanics
- Aluminum Alloy Microstructure Properties
- Advanced materials and composites
- Metal Alloys Wear and Properties
- Advanced Materials Characterization Techniques
- Advanced ceramic materials synthesis
- Cellular and Composite Structures
- Advanced Welding Techniques Analysis
- Metallurgical Processes and Thermodynamics
- Additive Manufacturing and 3D Printing Technologies
- Metallurgy and Material Forming
- nanoparticles nucleation surface interactions
- Metallurgical and Alloy Processes
- Microstructure and mechanical properties
- Magnesium Alloys: Properties and Applications
- Powder Metallurgy Techniques and Materials
- Aluminum Alloys Composites Properties
Ruhr University Bochum
2016-2023
This work investigates the separate influence of porosity and γ/γ′-eutectics on low-cycle fatigue life a single-crystal Ni-base superalloy at high temperatures. A conventional vacuum furnace heat-treatment but also integrated heat-treatments in hot isostatic press are applied to produce different material variants same alloy. High-resolution electron microscopy revealed that both pores act as crack starters, thus initiating early failure. Moreover, results indicate remaining can weaken...
Refractory chemically complex alloys with bcc-based microstructures show great potential for high-temperature applications but most of them exhibit limited room-temperature ductility, which remains a challenge. One such example is the AlMo0.5NbTa0.5TiZr alloy, mainly consisting nano-scaled structure an ordered B2 matrix and high-volume fraction aligned cuboidal coherently embedded A2 precipitates. This work aims to investigate how cooling rate after hot isostatic pressing alloy affects its...
The creep behavior of a single‐crystal Ni‐base superalloy in two microstructural states is compared. One obtained by casting followed conventional heat treatment. other results from the same nominal treatment integrated into hot isostatic pressing process. microstructure after HIP differed that route respects. First, γ′ particles are smaller and γ channels narrower. Second, HIP, number density pores lower pore sizes smaller. improves respects: finer γ/γ′‐microstructure minimum rates....
In the present work, we study effect of HIP rejuvenation treatments on creep behavior and residual life a pre-crept single crystal Ni-base superalloy type CMSX-4. The work combines miniature experiments precisely oriented [001] tensile specimens with quantitative analysis scanning transmission electron micrographs. A HIP-rejuvenation treatment after 5.0% pre-strain significantly improves strength. However, microstructural damage induced by pre-deformation could not be fully removed. series...
Turbine blades in aviation engines and land based gas-turbines are exposed to extreme environments. They suffer damage accumulation associated with creep, oxidation fatigue loading. Therefore, advanced repair methods of special interest for the gas-turbine industry. In this study, CMSX-4 powder is sprayed by Vacuum Plasma Spray (VPS) on single-crystalline substrates similar compositions. The influence substrate temperature investigated altering heating stage between 850 °C 1000 °C. Different...
Abstract Super-solidus hot isostatic pressing (SSHIP) heat treatment has first been developed and applied to the third-generation Ni-base single crystal superalloy CMSX-10 K. This new type of aims at significantly reducing total time required for solution enhancing mechanical properties as compared conventional routes. The SSHIP is an innovative, economical sustainable approach that can be all types SX superalloys. It especially interesting alloys with a high content refractory elements...
Initially, as‐cast and homogenized single crystals of nickel‐base superalloy CMSX‐4 are subjected to hot isostatic pressing at 1288 °C. Two series experiments conducted: under the same pressure 103 MPa but with different durations, between 0.5 6 h, pressures, 15 150 MPa, for time h. The porosity annihilation is investigated metallographically by high‐resolution synchrotron X‐ray tomography. obtained experimental results compared predictions vacancy model proposed recently in group. Herein,...
Abstract A hot isostatic pressing rejuvenation heat treatment is applied to a CMSX-4 type SX superalloy after it has been subjected low-cycle fatigue test rupture. The evolution of microstructural defects, such as pores and cracks which are present fatigue, tracked in 3D by X-ray tomography before rejuvenation. From the rejuvenated specimen, series metallographic cross sections were prepared investigated scanning electron microscopy for getting complementary 2D information at high...
Microstructural Design of Ni-base Superalloys by Hot Isostatic Pressing Benjamin Ruttert, Inmaculada Lopez-Galilea, Lais Mujica Roncery, Werner Theisen Abstract. Single-crystal superalloys (SXs) are used as a first-stage blade material in high-pressure turbines for aero engines or stationary gas turbines. They operate at temperatures close to their melting point where they have withstand […]
Initially as-cast and homogenized single-crystals of nickel-base superalloy CMSX-4 were subjected to hot isostatic pressing at temperature 1288 °C. Two series experiments performed: under the same pressure 103 MPa but with different durations, between 0.5 6 h, pressures, 15 150 MPa, for time h. The porosity annihilation was investigated metallographically by high resolution synchrotron X-ray tomography. obtained experimental results compared predictions vacancy model proposed recently in our...