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3 edition of A Study of microstructural characteristics of Ni-based superalloys at high temperatures found in the catalog.

A Study of microstructural characteristics of Ni-based superalloys at high temperatures

A Study of microstructural characteristics of Ni-based superalloys at high temperatures

semi-annual technical report.

  • 224 Want to read
  • 27 Currently reading

Published by Dept. of Physics, Alabama Agricultural and Mechanical University in Normal, Ala .
Written in English

    Subjects:
  • Chromium-cobalt-nickel-molybdenum alloys -- Thermal properties.,
  • Nickel alloys -- Thermal properties.

  • Edition Notes

    SeriesNASA-CR -- 183377., NASA contractor report -- NASA CR-183377.
    ContributionsUnited States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15288584M

      In this study, the ultrahigh-temperature tensile creep behaviour of a TiC-reinforced Mo-Si-B-based alloy was investigated in the temperature range of – °C at constant true stress. The Cited by: 5. Effect of variation in microstructure on high temperature creep of Fe-Ni-Cr superalloy Esah Hamzah1), its advantages such as high strength and corrosion resistant at high temperatures, this Nickel-based superalloys with an exceptional combination of high temperature strength, toughness, and resistance to degradation in corrosive or Author: Esah Hamzah, Maureen Mudang, Muhammad Adil Khattak.

    Addition of Ru in Ni-base single crystal superalloys had been used to improve the elevated temperature strength and other multiple properties. Significant decreases in stacking fault energy of the γ phase and the volume fraction of γ′ phase are observed with the addition of Ru. As well as serving as an effective solid-solution strengthening element in high refractory content Ni-base single Cited by: 7. Two Ni-based PM superalloys (Inconel C & Udimet ), which have been processed by metal injection moulding (MIM), were analyzed with respect to their high-temperature properties. This included tensile tests at temperatures up to °C and evaluation of oxidation resistance up to °C.

    Nickel-based superalloys, due to their high heat resistance, strength and creep resistance at high temperatures, as well as toughness and corrosion resistance, are very often used for the construction of gas turbine engines. CMSX-4 is a second generation single-crystal superalloy containing 3 wt pct : Agnieszka Szczotok, Hannah Reichel. NI-BASED superalloys are widely used in power generation for gas turbine components due to their excellent high-temperature performance. These compo-nents are subjected to an aggressive combination of elevated temperature and high stress during service, which .


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A Study of microstructural characteristics of Ni-based superalloys at high temperatures Download PDF EPUB FB2

Get this from a library. A Study of microstructural characteristics of Ni-based superalloys at high temperatures: semi-annual technical report. [United States. National Aeronautics and. Get this from a library. A study of microstructural characteristics of Ni-based superalloys at high temperatures: final technical report.

[R B Lal; M D Aggarwal; George C. Marshall Space Flight Center.]. Due to the excellent comprehensive properties at elevated temperatures, superalloys have been widely adopted as high temperature materials for aircraft engines [1][2][3] [4] [5][6][7][8].

In terms. Study of microstructure and mechanical properties of high performance Ni-base superalloy GTD February Materials Science and Engineering A () Ni based superalloys have been developed more or less empirically over the past 60 years from a simple Ni-Cr matrix to the present multi element and phase systems[], having a fully austenitic face centred cubic (fcc) structure which maintains a superior tensile, fatigue and creep properties at high temperature to a body centred cubic (bcc) alloy[].Cited by: 8.

A Study of Microstructural Characteristics of Ni-Based Superalloys at High Temperatures. This is an ex-library book and may have the usual library/used-book markings book has hardback covers.

In fair condition, suitable as a study copy. No dust jacket. Please note the Image in this listing is a stock photo and may not match the. The chemical, physical, and mechanical characteristics of nickel-based superalloys are reviewed with emphasis on the use of this class of materials within turbine engines.

The role of major and minor alloying additions in multicomponent commercial cast and wrought superalloys is discussed. Microstructural stability and phases. However, the addition of high levels of refractory elements such as Re and W to these superalloys may lead to microstructural instabilities at higher temperatures.

Additionally, the large size of IGT blades also limits the use of the precious elements Re and Ru in consideration of the cost and their higher by: 6. Introduction. Superalloys are the materials of choice for components serving under load at elevated temperatures above °C, because of their excellent ability to retain strength, to withstand creep and fatigue, and to resist oxidation at such temperatures [, ].One of the most common applications of superalloys is turbine blades, which operate at high temperatures and under constant Cited by: The microstructural characteristics of the Ni-based superalloy MAR-M(Hf) which is used in manufacturing the components of the Space Shuttle's main engine have been studied.

These superalloys need optimal heat treatment to get the best results. A superalloy, or high-performance alloy, is an alloy with the ability to operate at a high fraction of its melting point. Several key characteristics of a superalloy are excellent mechanical strength, resistance to thermal creep deformation, good surface stability, and resistance to corrosion or oxidation.

The crystal structure is typically face-centered cubic (FCC) austenitic. steels and Ti-alloys as well as Ni-based superalloys [12,13].

A noticeable feature of the present work is that flow softening at high temperatures arises as a direct result of the calculations. As such three regions of behaviour are calculated. (i) At low temperatures flow is predominantly governed by dislocation glide.

High-temperature superalloys are mainly classified into three groups: nickel based, cobalt based, and iron-nickel based alloys. Among the super alloys, the most widely used are nickel-based alloys, which contain at least 50% nickel [].Two types of strengthening methods are used in these alloys: (1) solid solution strengthening (annealing) and (2) precipitation heat treatment (aging).Cited by: 9.

single crystal superalloys have been developed since the early ’s. For example, TMS+ and TMS were developed at NIMS as a modified second- and a third-generation SC superalloys [].

TMS+ is of high phase stability and excellent high temperature creep strength. Blades made of. The effects of ruthenium and chromium contents have been investigated on phase transformation temperatures and the morphology of γ’ precipitates as well as microstructural stability in high refractory Ni-base superalloys.

The solidus and liquidus temperatures were determined by differential scanning calorimetry (DSC), suggesting that the addition of Cr resulted in a decrease in solidus Cited by: 4. @article{osti_, title = {Microstructural changes in a Ni-base superalloy during service}, author = {Ohta, Y and Yoshizawa, H and Nakagawa, Y G}, abstractNote = {This paper reports on the microstructural changes examined for a conventionally cast nickel base superalloy, Mar-M In particular, the first and second stage turbine blades in an experimental turbogas power plant were used.

Ni-based superalloys have been developed more or less empirically over the past 60 years from a simple Ni-Cr matrix to the present multi element and phase systems, having a face centred cubic (fcc) structure which maintains mechanical properties superior at high temperatures to body centred cubic (bcc) alloys [1].

From the point of view of. The microstructural evolution and mechanical properties were examined in a Ni-based superalloy, TMW-4, with high Co and Ti contents at temperatures ranging from °C to °C for various times up to hours.

The results showed that solution treatments (temperatures: from °C to °C; time: 4 hours) essentially affected the fraction and size of primary and secondary γ Cited by:   It is well known that solid solution-strengthened alloy and γ′ precipitation-strengthened alloy have excellent mechanical properties and corrosion resistance at high temperatures.

Hyper-supercritical power plants work at temperatures above  °C, and these superalloys are considered candidate materials for steam turbines components of these power plants.

In this study, Cited by: 8. Presents all the main aspects of the microstructure of nickel-base superalloys, and includes micrographs chosen from among a large range of commercial and academic alloys, from the as-cast product to in-situ components, worn from in-service use. Including more than illustrations, the text explains all the transformation mechanisms involved in the origination (creation) of microstructures 3/5(1).

Ni-based superalloys are critical engineering materials that are frequently utilised as hot sections of aircraft engines and gas turbines owing to their superior high-temperature mechanical properties, such as high-temperature strength, creep and fatigue resistance, as well .consider to asses microstructural variation of Alloy Rene 95 forged specimens.

2. EXPERIMENTAL STUDY To investigate the material flow and microstructural evolution, compression tests on cylindrical specimens with 8 mm in diameter and 13 mm in length were done at the temperatures between and oC with strain rates between and Abstract: It is well known that solid solution-strengthened alloy and γ ′ precipitation-strengthened alloy have excellent mechanical properties and corrosion resistance at high temperatures.

Hyper-supercritical power plants work at temperatures above °C, and these superalloys are considered candidate materials for steam turbines components of these power plants.