Precipitation in Powder Metallurgy, Nickel Base Superalloys: Review of Modeling Approach and Formulation of Engineering (Postprint)

reportActive / Technical Report | Accession Number: AD1032139 | Open PDF

Abstract:

Methods for determining the various thermodynamic and kinetic parameters required for the modeling of precipitation in powder-metallurgy PM, nickel-base superalloys are summarized. These parameters comprise the composition of the phase, the solvus temperatureequilibrium solvus approach curve, the free energy G associated with the decomposition of the matrix to form , the interfacial energy , and an effective diffusivity for use in nucleation, growth, and coarsening calculations. Techniques to obtain the material data include phase extraction for the average composition of and heat-treatmentquantitative metallography for a two-parameter fit of the solvus approach curve. With regard to G, two methods, one based on the instantaneous composition of the and phases and the other on the enthalpy of transformation and the solvus temperature, are summarized. It is shown that the interfacial energy can be determined from the nucleation-onset temperature as indicated by on-cooling specific-heat measurements

Author(s):
Semiatin, S. L. ; Zhang, F. ; Larsen, R. ; Chapman, L. A. ; Furrer, D. U.
Author Organization(s):
Air Force Research Laboratory, Materials and Manufacturing Directorate Wright Patterson Air Force Base
Descriptive Note:
Journal Article
Supplementary Note:
Integrating Materials and Manufacturing Innovation , 5, 3, 01 Jan 0001, 01 Jan 0001, Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Pagination:
0023

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release;

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
AFRL-RX-WP-JA-2016-0333
Contract/Grant Number(s):
IN-HOUSE
 Subject Terms
Joint Capability Areas:
JCA_5_Command and Control; JCA_5.3_Planning; JCA_3.2_Engagement; JCA_3_Force Application; JCA_3.2.1_Kinetic Means; JCA_7.2.1_Mitigate Lethal Effects; JCA_7.2_Mitigate; JCA_7_Protection; JCA_6.4.1_Secure Information Exchange; JCA_1_Force Support; JCA_4.6_Engineering; JCA_5.3.3_Develop Strategy; JCA_5.3.4_Develop Courses of Action; JCA_5.3.5_Analyze Courses of Action; JCA_6.4_Information Assurance; JCA_6_Net Centric; JCA_1.2_Force Preparation; JCA_4.5.4_Requirements Definition; JCA_4.5_Operational Contract Support; JCA_8_Building Partnerships
Modernization Areas:
Microelectronics
Communities of Interest:
No COI(s) Identified
Descriptor(s):
POWDER METALLURGY, mechanical properties, high temperature, specific heat, solid solutions, crystal structure, surface energy, thermodynamics, chemical analysis, Superalloys, growth general, Precipitation, Nucleation, DIFFUSIVITY, metallography, heat treatment, enthalpy
Keyword(s):
Gamma prime, Coarsening, Solvus approach curve, Nickel base superalloys, Interface energy, Free energy of transformation
Report Date:
2016 Dec 01
Creation Date:
2017 May 23