3 edition of Hot corrosion of single-crystal NiAl-X alloys found in the catalog.
Hot corrosion of single-crystal NiAl-X alloys
by National Aeronautics and Space Administration, Lewis Research Center, National Technical Information Service, distributor in [Cleveland, Ohio], Springfield, VA
Written in English
|Other titles||Hot corrosion of single crystall NiAl X alloys.|
|Statement||James A. Nesbitt.|
|Series||NASA technical memorandum -- 113128.|
|Contributions||Lewis Research Center., United States. National Aeronautics and Space Administration.|
|The Physical Object|
increase the resistance against hot corrosion and the topological descriptors of nickel-based alloy Udimet® behavior of single crystal superalloys is significant for a better. Abstract Conventionally cast Alloy LC is characterized by good creep rupture strength and corrosion resistance at high temperatures and is therefore .
CiteScore: ℹ CiteScore: CiteScore measures the average citations received per peer-reviewed document published in this title. CiteScore values are based on citation counts in a range of four years (e.g. ) to peer-reviewed documents (articles, reviews, conference papers, data papers and book chapters) published in the same four calendar years, divided by . This book contains the Proceedings 13th International Symposium on Superalloys. CMSX‐4® Plus Single Crystal Alloy Development, Characterization and Application Development (Pages: ) Effect of Re and Ta on Hot Corrosion Resistance of Nickel‐base Single Crystal Superalloys (Pages: ) J.X. Chang;.
Figure Hot corrosion of Stellite alloys in 50 ppm salt/% sulphur fuel medium. 47 Figure Dry sliding wear map for Stellite 6 against a WC-Co 90/10 disc  49 Figure Erosion test curves of Stellite alloys  51 Figure Influence of yttrium additive on wear behavior of Stellite 6 at elevated temperatures  Hot corrosion of metals or alloys is an accelerated oxidation process due to the deposition of a thin film of molten salts, sulphates, on the material surface at temperature between
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Get this from a library. Hot corrosion of single-crystal NiAl-X alloys. [J A Nesbitt; Lewis Research Center.]. additions on the environmental resistance of NiAl-X was unclear. Hence, the present study was undertaken to examine the hot corrosion behavior of these alloys. A companion study examined the cyclic oxidation resistance of these alloys.
Several single-crystal NiAl-X alloys (where X is Hf, Ti, Cr, or Ga) underwent hot. Several single-crystal NiAl-X alloys (X=Hf, Ti, Cr, Ga) underwent hot corrosion testing in a Mach burner rig at deg. C for 1-hr cycles. The surface morphology after testing consisted of either mounds or an inward, uniform-type of attack which preserved surface : James A.
Nesbitt. Several single-crystal NiAl-X alloys (where X is Hf, Ti, Cr, or Ga) underwent hot corrosion testing in a Mach burner rig at the NASA Lewis Research Center. Samples were tested for up to 1-hr cycles at a temperature of C. It was found that increasing the Ti content from 1 to 5 at.% degraded the hot corrosion : James A.
Nesbitt. Again, only Cr provided protection against hot corrosion attack, although the best-performing alloy (2% Cr) was not as hot corrosion resistant as cast NiCoCrAlY (17 at.% Cr), which was included for comparison in the absence of data for true Type-I hot corrosion for these alloys.
Download: Download full-size image; Fig. Specimen mass gain vs Cited by: Metallurgical analysis (Nadeau, ) of nickel-based single-crystal superalloy turbine blades from commercial flight engines operating in the Middle East and Far East shows significant internal hot corrosion commensurate with the temperature profile of the locations.
Estimated temperature at corrosion locations was within that of type II regime. Konter, H-P. Bossmann, in Modern Gas Turbine Systems, Coating consumption.
Hot corrosion and oxidation life of MCrAlY have been prolonged by increasing the level of sacrificial elements Cr and/or Al, and by addition of other elements to reduce growth rate and spallation of the TGO.
Detailed studies have shown that even minor changes of some elements (i.e. Nickel alloys are also subject to reaction with S and O at grain boundaries. Nickel alloys are also affected by “hot corrosion”: depositing elements (Na, K, S, Cl, Pb, Zn, Fe, Ca) can form low-melting eutectics well below °C.
Its deposition depends on feedstock and operating conditions. The use of biomass (co-)firing may increase this. High-Temperature Corrosion Failure of Single Crystal Super alloy Turbine Blades. Vijay VijayaRaghavan. Head Corrosion Material Engineering. Qatar Petroleum-Dukhan Operation. Dukhan Road.
Dukhan, Qatar. Fax No: (+) E-mail: [email protected] International Journal of Scientific & Engineering Research, Volume 7, Issue. 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.
Type-I hot corrosion behaviour of single crystal Ni-base superalloys with different Cr and Ta contents in molten Na 2 SO 4 at °C and °C in static air were investigated using the “deposit recoat” method. It was shown that: 1. Hot corrosion behaviour of all the alloys at °C was worse than that at °C.
Several single-crystal NiAl-X alloys (X=Hf, Ti, Cr, Ga) underwent hot corrosion testing in a Mach burner rig at deg. C for 1-hr cycles. Single crystal superalloys were screened in Type II molten (Na,K)-sulfate hot corrosion re-coat tests in air + ppm SO2 at °C.
They exhibited large 20–40 mg/cm2 weight changes, repeated spallation, and non-protective, 25–50 μm thick corrosion layers after h of testing. Scale cross sections revealed dual outer Ni(Co)O and inner Al(Cr)S-rich corrosion layers.
CYCLIC OXIDATION OF SINGLE-CRYSTAL NIAL-X ALLOYS James A. Nesbitt, Charles A. Barrett, Ram Darolia NASA Glenn Research Center General Electric Aircraft Engines Cleveland, OH 44 13 5 Cincinnati, OH 5 ABSTRA Several single-crystal NiAI-X alloys (X=Hf, Ti, Cr, Ga) were cyclically oxidized at 1 °C for up to 1 -hr cycles.
Purchase Superalloys, Supercomposites and Superceramics - 1st Edition. Print Book & E-Book. ISBNNote: 5 ppm sea salt injection. Among the alloys tested, alloy X (CoCrNiW) performed best.
This is in good agreement with the operating experience obtained by Royal Navy Ship (U.K.), which has demonstrated the superior hot corrosion resistance of alloy X in a marine environment. Alloy X is welded by all common methods such as gas tungsten arc, gas metal arc, shielded metal arc, electron beam and resistance welding.
Use matching filler metal, keep interpass temperature low. After severe forming, fabrications may be annealed °F, 15 minutes per 1/8" of thickness, rapid air cool. nickel alloys as well as the cobalt-based alloys, which have been used in the combustor or as first-stage turbine vanes.
Early turbines used alloys such as IN and parts were made from forgings or castings. However, compo-nent life was limited by oxidation, corrosion, strength, creep, and cyclic properties.
As en. hot corrosion resistance of Alloy which is associated with a higher level of chromium than found in D.S. MAR-M + Fig. ‘7 Hot corrosion resistance of Alloy and D.S. MAR-M + Hf. Hf and the absence of molybdenum, vanadium or high levels of tungsten that are contained in most superalloys.
Hot Corrosion of Single-Crystal NiAl-X Alloys. Article. Jun ; James Nesbitt. Several single-crystal NiAl-X alloys (X=Hf, Ti, Cr, Ga) underwent hot corrosion testing in a. "This practical guide provides an introduction for understanding the compositional complexity of superalloys superalloy and the wide range of alloys developed for specific applications.
The basics of alloying, strengthening mechanisms, and structure of superalloys are explained in optimizing particular mechanical properties, oxidation/corrosion resistance, and 3/5(1).extrusion, hot and cold rolling, and cold drawing. Product forms available from Special Metals include billet, bar, rod, plate, sheet, strip, seamless tubing, wire and welding consumables.
Nickel – Commercially pure wrought nickel with good mechanical properties and aqueous corrosion-® alloy ® ® alloy. "This book can be recommended as a textbook for students major in corrosion or professors preparing their lectures the book will be definitely interesting for corrosion scientists and engineers due to useful practical hints and can be recommended as a reference book for professionals using aluminium, magnesium, and their alloys".Reviews: 1.