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Title: Effects of Cooling Rate on the Microstructure of a Commercial Ni-Based Superalloy Using Atom Probe Tomography

Abstract

No abstract prepared.

Authors:
 [1];  [2];  [3];  [1]
  1. Ohio State University
  2. ORNL
  3. Northwestern University, Evanston
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Shared Research Equipment Collaborative Research Center
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
936030
DOE Contract Number:
DE-AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: Microscopy & Microanalysis 2007, Fort Lauderdale, FL, USA, 20070806, 20070809
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ATOMS; HEAT RESISTING ALLOYS; MICROANALYSIS; MICROSCOPY; MICROSTRUCTURE; PROBES; TOMOGRAPHY

Citation Formats

Sarosi, P. M., Miller, Michael K, Isheim, D., and Mills, Michael J. Effects of Cooling Rate on the Microstructure of a Commercial Ni-Based Superalloy Using Atom Probe Tomography. United States: N. p., 2007. Web.
Sarosi, P. M., Miller, Michael K, Isheim, D., & Mills, Michael J. Effects of Cooling Rate on the Microstructure of a Commercial Ni-Based Superalloy Using Atom Probe Tomography. United States.
Sarosi, P. M., Miller, Michael K, Isheim, D., and Mills, Michael J. Mon . "Effects of Cooling Rate on the Microstructure of a Commercial Ni-Based Superalloy Using Atom Probe Tomography". United States. doi:.
@article{osti_936030,
title = {Effects of Cooling Rate on the Microstructure of a Commercial Ni-Based Superalloy Using Atom Probe Tomography},
author = {Sarosi, P. M. and Miller, Michael K and Isheim, D. and Mills, Michael J.},
abstractNote = {No abstract prepared.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}

Conference:
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  • An atom probe field ion microscopy and transmission electron microscopy characterization has been performed on the intragranular precipitates that are formed in a niobium-modified nickel-base superalloy 718 after the various stages of a multistage heat treatment. Atom probe results indicate that there is a wide variation in the compositions of the DO{sub 22}-ordered {gamma}{double prime}, the Ll{sub 2}-ordered {gamma}{prime} precipitates and the {gamma} matrix with heat treatment and with position in the microstructure. 7 refs., 4 figs., 7 tabs.
  • Effects of rare earth yttrium on microstructure of Ni–16Mo–7Cr–4Fe alloy were examined by optical microscopy, scanning electron microscopy, transmission electron microscopy and X-ray fluorescence. M{sub 6}C phase was observed in the alloys with and without yttrium addition, and Ni{sub 17}Y{sub 2} phase existed in the alloys containing 0.05–0.43 wt.% yttrium simultaneously. The amount of Ni{sub 17}Y{sub 2} phase increased as yttrium concentration increased. When the concentration of yttrium increased to 0.43 wt.%, some multi-precipitated phase regions appeared in the form of large amount of coarse Ni{sub 3}Y phase surrounded by M{sub 6}C phase and γ phase in the alloy. Influencesmore » of rare earth yttrium on high temperature static oxidation and mechanical properties of Ni–16Mo–7Cr–4Fe alloy were also investigated. The alloy containing 0.05 wt.% yttrium showed the best oxidation resistance and mechanical properties simultaneously. The adequate concentration of yttrium at grain boundary and in the solid-solution (γ phase) and the adhesion enhancement of the outer oxidation scale to the substrate are key factors for the improvements in the mechanical properties and oxidation resistance respectively. - Highlights: • When the content of yttrium reaches to 0.43%, some multiphase regions appear. • When the content of yttrium reaches to 0.43%, some Ni{sub 17}Y{sub 2} chains appear. • The morphology of M{sub 6}C changes with increasing concentration of yttrium. • The Ni–16Mo–7Cr–4Fe alloy with 0.05% yttrium performs the best mechanical property. • The Ni–16Mo–7Cr–4Fe alloy with 0.05% yttrium performs the best oxidation resistance.« less
  • No abstract prepared.
  • No abstract prepared.
  • A series of cast Ni-base {gamma}/{gamma}{prime} Superalloys with nominally fixed levels of 1 w/o Ti, 2w/o W, 1 w/o Nb, .10 w/o Zr, .12 w/o C and .01B w/o were systematically varied at selected levels of Co, Cr, Mo, Ta, and Al. The alloy compositions were based on a full 2{sup 5}-fractional statistical design supplemented by 5 x 2 star point alloys and center point alloy. This full composite design of 43 alloys allows a complete second degree (main effect, 2 factor interaction and square terms) estimating equation to be derived from the 5-compositional variables. The elemental levels varied weremore » Mo 0 to 4%, Cr 6 to 18%, Co 0 to 20%, Ta 0 to 8%, and Al 3.25 to 6.25%. The cyclic oxidation resistance was determined from specific weight change data as a function of time for one-hour cycles in static air from 1000 to 1150C. A derived oxidation attack parameter, Ka, was fitted over the alloy sample space.« less