What are the mechanical properties of corner crack in superalloys under vacuum conditions?
Best insight from top research papers
The mechanical properties of corner cracks in superalloys under vacuum conditions have been studied . The crack-tip behavior in vacuum is primarily controlled by mechanical deformation, and a criterion based on accumulated plastic strain is sufficient to describe the damage . The effects of oxidation on crack-tip deformation have also been investigated, and a synergetic interaction between fatigue loading and oxygen penetration has been observed . The presence of oxygen penetration into the crack tip induces a local compressive stress that compensates for some of the tensile stresses from mechanical loading . A two-parameter crack-growth criterion, based on accumulated plastic strain and oxygen concentration at the crack tip, has been developed to predict crack growth rate under fatigue-oxidation conditions .
Answers from top 4 papers
More filters
| Papers (4) | Insight |
|---|---|
2 Citations | The provided paper does not specifically mention the mechanical properties of corner cracks in superalloys under vacuum conditions. |
| The provided paper does not mention the mechanical properties of corner cracks in superalloys under vacuum conditions. | |
| The provided paper does not mention the mechanical properties of corner crack in superalloys under vacuum conditions. | |
| The provided paper does not mention the mechanical properties of corner crack in superalloys under vacuum conditions. |
Related Questions
How does elemental segregation affect the mechanical properties of high entropy alloys?10 answersElemental segregation significantly influences the mechanical properties of high entropy alloys (HEAs) by affecting their deformation behavior, strength, ductility, and corrosion resistance. Molecular dynamics simulations have shown that grain boundary (GB) segregation can either enhance or deteriorate the plasticity of nanoscale CoCrCuFeNi HEAs, depending on the elemental composition of the segregation layer, with copper and nickel segregations increasing plasticity, while chromium segregations decrease it. Cold rolling of additively manufactured HEAs has been used to achieve fine grain and discontinuous precipitation-containing microstructures, leading to an excellent yield strength and ductility due to the high grain boundary mobility and elemental micro-segregation. Experimental studies on bulk high entropy Cantor alloys have indicated that chromium strongly segregates to the GBs, affecting the driving forces for GB segregation and thereby influencing mechanical properties.
Elemental segregation has also been observed after low cycle fatigue loading, suggesting that cyclic straining assists in the precipitation of phases and elemental segregation, which could impact the fatigue properties of HEAs. In medium-entropy alloys, aluminum segregation at dendritic boundaries has been shown to influence mechanical properties by affecting the element distribution and type of precipitates formed. Iron-based HEAs containing aluminum have demonstrated that solidification time significantly affects segregation, which in turn influences mechanical properties. Additive manufacturing techniques like selective laser melting can produce MEAs with segregated microstructures that exhibit an excellent combination of strength and ductility, as well as superb corrosion resistance due to the formation of a stable passive film. Segregation can reduce chemical diversity but increase the number of catalytically active sites, potentially affecting the material's mechanical and corrosion properties. Ultrasonic melt treatment has been found to suppress dendritic segregation in HEA coatings, improving their hardness, elastic modulus, creep resistance, and corrosion properties. Finally, the distribution of chemical elements within HEAs has been linked to their deformation mechanisms and mechanical properties, with atomic simulations and experiments showing that local variations in chemical compositions play a critical role in deformation partitioning.
How does heat treatment affect the microstructure and mechanical properties of Inconel 718 superalloy sheet?5 answersHeat treatment plays a crucial role in shaping the microstructure and mechanical properties of Inconel 718 superalloy sheets. Different heat treatment processes lead to varied microstructural evolution and mechanical characteristics. For instance, the formation of intermetallic phases like γ′′ and γ′, as well as the morphology of precipitated phases such as δ phase, significantly impact the alloy's properties. Heat treatments like standard solution treatment plus aging (STA) and high-temperature homogenization plus STA (HSTA) influence the distribution of elements and the fracture mechanisms, transitioning from ductile to mixed fracture modes. Additionally, the presence and morphology of phases like Nb-rich Laves phase and γ′′ (Ni3Nb) strengthening precipitates are altered post-heat treatment, leading to enhanced hardness and mechanical strength in the alloy.
Do surface coatings below 200 nm affect the mechanical properties of the material?5 answersSurface coatings below 200 nm can affect the mechanical properties of the material. For example, thin hard coatings in the range of a few micrometers can significantly improve the friction and wear properties of components or tools. Additionally, ceramic nanostructured superlattice coatings (NSC) deposited using the physical vapor deposition (PVD) technique demonstrated higher wear resistance, lower friction coefficient, and higher hardness of the coated workpieces compared to the substrate material. Furthermore, the effect of epoxy-polyester powder coatings on the mechanical properties of plates made of rolled sheet steel was studied, and it was found that the presence of coatings significantly reduced the bearing capacity and critical buckling load of the plates in compressive strength tests. Therefore, it can be concluded that surface coatings below 200 nm can have a noticeable impact on the mechanical properties of the material.
What are the mechanical properties of platinum tungsten alloys?5 answersPlatinum tungsten alloys were not mentioned in any of the provided abstracts.
Are there any research of fracture in metals in vaccum?5 answersFracture in metals in vacuum has been the subject of research. Wciślik and Lipiec conducted a literature review on the development of microvoids in metals, leading to ductile fracture associated with plastic deformation. Niwa et al. examined the atomic structure of copper during the fracture process on the nanosecond scale using X-ray absorption spectroscopy and X-ray diffraction. Buravova et al. experimentally modeled the dynamic fracture of a metal and observed the formation of a channel-like crack under the contact zone. Therefore, research has been conducted to understand the fracture behavior of metals in vacuum, including the development of microvoids, changes in atomic structure, and the formation of cracks.
Four-point bending strength of superalloys?3 answersThe four-point bending strength of superalloys has been studied in several papers. Lee found that the average four-point bending strength of Si3N4/Inconel 600 alloy joints was 344 MPa. Parthasarathy and Rao developed a numerical model to predict the yield strength of superalloys, including the four-point bending strength. They used a physics-based discrete dislocation simulation model to build a fast spreadsheet model that accurately predicted the yield strength based on composition and microstructural parameters. The model was compared to experimental data and showed good correspondence. These studies highlight the importance of understanding the four-point bending strength of superalloys for various applications.