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Report developed under STTR contract for topic AF08-T004. This report describes a Phase I feasibility study of applying a non-contact method for measuring creep in ultra high . A non-contact technique for measuring the creep properties of materials has been developed and validated as part of a collaboration among the University of .
This paper describes changes to specimen grips and specimen design in order to creep test steels at temperatures a little below the spalling temperature and at low stresses . Conventional techniques for measuring creep are limited to about 1700 C, so a new technique is required for higher temperatures. This technique is based on electrostatic .This research develops a non-contact method for the measurement of creep at the temperatures over 2,300 C. Using the electrostatic levitator in NASA MSFC, a spherical sample was rotated . Considering the common and feasible practice of representing high-temperature structural characteristics using microstructures cooled to room temperature, it is reasonable to .
To address the UHT anisotropy, a finely-designed [111]-oriented single crystal (SX) superalloy, enriched with 1.5 wt.% Re, has been developed. The present alloy demonstrated . Non-contact Creep Resistance Measurement for Ultra-High Temperature Materials Conventional techniques for measuring creep are limited to about 1700 C, so a new technique is required for higher temperatures. This technique is based on electrostatic levitation (ESL) of a spherical sample, which is rotated quickly enough to cause creep deformation by .
An interface modification strategy has been developed to uniformly distribute high-density sub-10 nm coherent MgO particles in an Al matrix, resulting in high strength and creep resistance at . Creep property of high-temperature titanium alloys is one of the most important indexes to evaluate their high-temperature performance. The microstructure of titanium alloy materials plays a decisive role in creep resistance. Coarser the grains are and finer the secondary phase is, better is the creep property. Suitable hot deformation parameters, heat . If parts of the clamping system are subjected to high temperatures (which is often the case when using resistance furnaces or environmental chambers), these parts have to be manufactured from high temperature materials which show at least a comparable high temperature strength and creep resistance as the material to be tested. The creep behavior of single crystals of the nickel-based superalloy CMSX-4 was investigated at 1288 °C, which is the temperature of the hot isostatic pressing treatment applied to this superalloy in the industry. It was found that at this super-solvus temperature, where no γ′-strengthening occurs, the superalloy is very soft and rapidly deforms under stresses between .
Very high temperature creep properties of twelve different Ni-based single crystal superalloys have been investigated at 1250 °C and under different initial applied stresses. The creep strength at this temperature is mainly controlled by the remaining γ′ volume fraction. Other parameters such as the γ′ precipitate after microstructure evolution and the γ/γ′ lattice .Conventional techniques for the measurement of creep are limited to about 1700 °C. A new method which can be applied at temperatures higher than 2000 °C is strongly demanded. This paper presents a non-contact method for creep measurements of ultra-high-temperature materials at 2300 °C. Using the electrostatic levitation facility at NASA MSFC .
High-temperature titanium alloys are one of the most important research directions in the field of high-temperature aerospace alloys. They are mainly used in high-temperature-resistant components, such as blade disks, blades, and casings of aero-engines, and are key materials in a new generation of high thrust-to-weight ratio aero-engines. In the service environment of . Creep of crystalline materials at high temperatures is a thermally activated process and is governed by the mobility of point or line defects. Shear or sliding in the grain-boundary regions introduces additional complexities to the creep of polycrystalline materials at elevated temperatures. After the sample was mechanically ground and polished, it was put into a CTM504A high-temperature creep/endurance testing machine, and the creep performance was tested at a temperature of 1160–1180 °C and a stress of 110–130 MPa to study the ultra-high-temperature creep behavior of the 6.0% Re/5.0% Ru single-crystal alloy.
Creep resistance is one of the most important mechanical properties for elevated-temperature structural applications, such as components for steam turbines in thermal-power plants 1,2,3,4,5,6 .
Semantic Scholar extracted view of "High temperature creep testing of ceramics" by D. F. Carroll et al. . which verifies that the SPS apparatus can serve as a tool for measuring compressive creep strain of materials. Expand. 8 [PDF] Save. . Non-contact measurement of creep resistance of ultra-high-temperature materials. Fig. 1 a presents the creep curve of the designed alloy deformed under 1150 °C and 137 MPa condition, loading direction was along [111] direction. As shown, the alloy's creep life was approximately 217 h, setting a new record in literatures [10].The total creep strain was about 6 %, and the minimum strain rate was calculated to be about 5 × 10 −5 /s. Exceptional Ultra-High Temperature Creep Resistance of a [111]-Oriented Single Crystal Superalloy. AMI: Scripta Materialia. . [111] orientation offers a solution to the trade-off between UHT creep resistance and material density. Keywords: Single crystal superalloys, Anisotropy, Ultra-high Temperature Creep, Dislocation, .
Creep prevention is based on the proper choice of material is also crucial. Creep resistance of materials can be influenced by many factors such as diffusivity, precipitate and grain size. . Creep is a very important phenomenon if we are using materials at high temperature. Creep is very important in power industry and it is of the highest .• Materials for high creep resistance-Refractory metals-Superalloys Dr. M. Medraj iversity MSE 521 Lecture 14/2 . . temperature; - measure deformation or strain and - plot as function of elapsed time. • Most tests are constant load type, which yield information of an We have shown that amorphous PAI with a Tg of 275 °C has very high creep resistance at 120 °C and 150 °C, through comparison to similar high-performance materials, such as PEEK and PEI. Using accelerated testing, we were also able to demonstrate the superiority of extrusion moulded PEI samples over injection moulded at 120 °C.
Creep testing reveals how high-temperature materials deform over time under constant stress, critical for designing durable components. . during which work hardening dominates until the recovery rate gradually increases. The material experiences high creep resistance during this stage. . From ABB Measurement and Analytics Analytical . First, we search in the compositional space near the previous SX superalloy with optimum creep resistance at ultrahigh temperature, the creep rupture life of SCA alloy is 135 h at 1200 °C–80 .
[33] Lee J 2007 Non-contact measurement of creep resistance of ultra-high-temperature materials (University of Massachusetts) PhD Dissertation Amherst, MA. Go to reference in article; Google Scholar [34] Brandt E H 1989 Levitation in physics Science 243 349–55. Go to reference in article; Crossref; Google Scholar This research develops a non-contact method for the measurement of creep at the temperatures over 2,300 C. Using the electrostatic levitator in NASA MSFC, a spherical sample was rotated to cause creep deformation by centrifugal acceleration. The deforming sample was captured with a digital camera and analyzed to measure creep deformation. Creep life, high-temperature tensile properties of creep strength enhanced ferritic-martensitic P92 steel and austenitic 304L stainless steel (SS) dissimilar weld joint were investigated. DWJ was prepared using tungsten inert gas welding process employing ERNiFeCr-2 (Inconel 718) filler metal. The creep tests were conducted at 650 °C under stresses ranging 80 . A novel ultra-high temperature Pt–25Rh (wt.%) alloy with a minor addition of rare-earth (RE) elements (0.2 wt% La and 0.2 wt% Ce) was developed for the first time which exhibits the capability .
High-temperature materials are used in a wide range of industries and applications such as gas turbine engines for aircrafts, power and nuclear power plants, different types of furnaces, including .In materials science, creep (sometimes called cold flow) is the tendency of a solid material to undergo slow deformation while subject to persistent mechanical stresses.It can occur as a result of long-term exposure to high levels of stress that are still below the yield strength of the material. Creep is more severe in materials that are subjected to heat for long periods and generally .
The high temperature strength and creep resistance of the alloy were effectively improved owing to the formation of the strengthening intermetallics. Abstract. A novel ultra-high temperature Pt–25Rh (wt.%) alloy with a minor addition of rare-earth (RE) elements (0.2 wt% La and 0.2 wt% Ce) was developed for the first time which exhibits the . Accurate measurements of creep strain are necessary to evaluate the condition and predict the remaining life of power plant constituent materials. Optical techniques are appropriate for this purpose as they are a non-contact method and can therefore be used to measure strain without requiring direct access to the surface.
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measurement of creep resistance of ultra-high-temperature materials|Exceptional ultra