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Dissertations / Theses on the topic 'Heat resistant alloys'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Al-Meshari, Abdulaziz I. "Metal dusting of heat-resistant alloys." Thesis, University of Cambridge, 2008. https://www.repository.cam.ac.uk/handle/1810/217872.

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Metal dusting leads to disintegration of such alloys as iron and nickel-based into a “dust” of particulate metal, metal carbide, carbon, and/or oxide. It occurs in strongly carburising environments at 400-900°C. Literature survey has shown that alloys behave differently in metal dusting conditions based on their composition and the environment. Metal dusting mechanisms for iron and nickel-based alloys have been proposed but, nevertheless, have not been agreed upon and numerous modifications to them have been suggested. Further adding to the complexity, the mechanisms were found to have differe

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2

From, Malin, Johanna Ejerhed, Artin Fattah, Markus Lindén, and Alex Karlstens. "Heat Resistant Steel Alloys : Atlas Copco." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-256662.

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Atlas Copco is interested in investigating the friction in the top-hammer drilling tool threads thatcauses the steel to heat up, leading to a phase transformation and a softer steel in the threads. Theaim of this project is to find a steel alloy or surface finishing that will retain its hardness atelevated temperatures better than the presently used threads material. The solution is intended tobe used as a replacement material for the threads. The potential material is meant to combat thepremature breakdowns of the threads and thus minimizing the economical losses. To achieve ourproject goal,

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3

Nowak, Igor Mateusz. "Development of heat resistant alloys for optimal creep performance." Thesis, University of Birmingham, 2015. http://etheses.bham.ac.uk//id/eprint/5916/.

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Heat resisting centrifugally cast tubes of HP micro alloy (25/35 Cr/Ni, 0.4C), are extensively used in steam reforming, which is currently the dominate technology for hydrogen generation. High pressure of the reacting gases inside the tubes generates high hoop stress in the tube wall and together with the temperature exposure of 900-1050°C causes the tubes to creep along the circumferential direction. The alloy's ability to successfully withstand the severe operating condition is highly dependent on its high temperature creep-rupture behaviour. In recent years a number of manufactures have int

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4

Calmunger, Mattias. "On High-Temperature Behaviours of Heat Resistant Austenitic Alloys." Doctoral thesis, Linköpings universitet, Konstruktionsmaterial, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-122945.

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Advanced heat resistant materials are important to achieve the transition to long term sustainable power generation. The global increase in energy consumption and the global warming from greenhouse gas emissions create the need for more sustainable power generation processes. Biomass-fired power plants with higher efficiency could generate more power but also reduce the emission of greenhouse gases, e.g. CO2. Biomass offers no net contribution of CO2 to the atmosphere. To obtain greater efficiency of power plants, one option is to increase the temperature and the pressure in the boiler section

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5

Highsmith, Shelby. "Probabilistic fatigue crack life prediction in a directionally-solidified nickel superalloy." Available online, Georgia Institute of Technology, 2004:, 2003. http://etd.gatech.edu/theses/available/etd-04082004-180222/unrestricted/highsmith%5Fshelby%5F200312%5Fms.pdf.

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6

Toh, Chin Hock Materials Science &amp Engineering Faculty of Science UNSW. "Metal dusting on heat-resistant alloys under thermal cyclic conditions." Awarded by:University of New South Wales. School of Materials Science and Engineering, 2002. http://handle.unsw.edu.au/1959.4/35011.

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Solid oxide fuel cells operate at elevated temperature, oxidising fuel gases to generate electricity. The fuel gas streams in the fuel cell systems are rich in carbon and have very low oxygen potential. Under these conditions, alloys can undergo metal dusting, which causes pitting or general thinning of the alloys. This process is not yet fully understood. It is, hence, not possible to accurately predict the susceptibility of a particular alloy in the atmospheres relevant to SOFC. Model Fe-Cr and Fe-Ni-Cr alloys were exposed to test the hypothesis that cementite formation and its decomposition

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7

Zhou, Ning. "Simulation study of directional coarsening (rafting) of [gamma]' in single crystal Ni-Al." Columbus, Ohio : Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1228152557.

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8

Underhill, Richard P. "The spray forming of Ni based superalloys." Thesis, University of Oxford, 1995. http://ora.ox.ac.uk/objects/uuid:a26505d4-90cf-41ff-86e9-fbf903c9a87f.

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The main aim has been to investigate the effect of process parameters on the spray forming of UDIMET 720 and in particular to understand the mechanism of grain size evolution in the deposit using a combination of experimental and computer modelling techniques. Samples of two spray formed Ni superalloys, MAR-M-002 and UDIMET 720, have been re-heated into the solid/liquid region and the fully solid region just below the solidus temperature for a series of times to try and reproduce the situation of grain growth in a spray formed deposit. Grain growth in the solid/liquid region follows the equati

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9

Eurich, Nikolai Carl. "First principles investigation of intermetallic phases and defects in Ni-base superalloys." Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.709196.

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10

Ibañez, Alejandro R. "Modeling creep behavior in a directionally solidified nickel base superalloy." Available online, Georgia Institute of Technology, 2004:, 2003. http://etd.gatech.edu/theses/available/etd-04072004-180026/unrestricted/ibanez%5Falejandro%5Fr%5F200312%5Fphd.pdf.

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11

Moricca, Maria del Pilar. "High temperature oxidation characteristics of Nb-10W-XCr alloys." To access this resource online via ProQuest Dissertations and Theses @ UTEP, 2009. http://0-proquest.umi.com.lib.utep.edu/login?COPT=REJTPTU0YmImSU5UPTAmVkVSPTI=&clientId=2515.

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12

Kong, Yonghua. "Effects of minor alloying on the microstructures and creep properties of RR2086 superalloys." Click to view the E-thesis via HKUTO, 2005. http://sunzi.lib.hku.hk/hkuto/record/B31634047.

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13

Bowman, R. R. (Randy R. ). "Effect of microstructure on the fatigue crack growth resistance of nickel-base super alloys." Diss., Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/20022.

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14

Chen, Wei. "Composition effects on macroscopic solidification segregation of superalloys." Morgantown, W. Va. : [West Virginia University Libraries], 2000. http://etd.wvu.edu/templates/showETD.cfm?recnum=1329.

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Thesis (Ph. D.)--West Virginia University, 2000.<br>Title from document title page. Document formatted into pages; contains xii, 145 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 143-145).

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15

Fernandez-Zelaia, Patxi. "Thermomechanical fatigue crack formation in nickel-base superalloys at notches." Thesis, Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/48991.

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Hot sections of gas engine turbines require specialized materials to withstand extreme conditions present during engine operation. Nickel-base superalloys are typically used as blades and disks in the high pressure turbine section because they possess excellent fatigue strength, creep strength and corrosion resistance at elevated temperatures. Components undergo thermomechanical fatigue conditions as a result of transient engine operation. Sharp geometric features, such as cooling holes in blades or fir-tree connections in disks, act as local stress raisers. The material surrounding these feat

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16

Hosamani, Laxmappa G. "Experimental and theoretical heat transfer studies in vacuum arc remelting /." Full text open access at:, 1988. http://content.ohsu.edu/u?/etd,166.

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17

Kish, Joseph J. "Active-passive corrosion of Fe-Cr-Ni alloys in hot concentrated sulphuric acid solutions /." *McMaster only, 1999.

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18

Highsmith, Shelby Jr. "Probabilistic fatigue crack life prediction in a directionally-solidified nickel superalloy." Thesis, Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/5410.

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19

Macia, Mario Luis. "The dendritic growth of γ in astroloy". Thesis, Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/20165.

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20

Tabrizi, Narges. "Optimizing the microstructure of single crystal Ni-base superalloys." Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708864.

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21

Talekar, Anjali S. "Oxidation behavior of Ni-base superalloys and high strength low alloy (HSLA) steels at elevated temperatures." abstract and full text PDF (UNR users only), 2008. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3316371.

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22

Quintero, Soltero Oscar. "Microstructural characterization of overaged GTD-111 HP turbine buckets." To access this resource online via ProQuest Dissertations and Theses @ UTEP, 2009. http://0-proquest.umi.com.lib.utep.edu/login?COPT=REJTPTU0YmImSU5UPTAmVkVSPTI=&clientId=2515.

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23

孔永華 and Yonghua Kong. "Effects of minor alloying on the microstructures and creep properties of RR2086 superalloys." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2005. http://hub.hku.hk/bib/B31634047.

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24

Collins, David Matthew. "Modelling and characterisation of the microstructure in a polycrystalline nickel-base superalloy." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610221.

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25

Bowman, R. R. (Randy R. ). "Effect of melt spinning on the microstructure and mechanical properties of three nickel base superalloys." Thesis, Georgia Institute of Technology, 1985. http://hdl.handle.net/1853/11301.

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26

Macia, Mario Luis. "A study of dendritic precipitation, grain boundary serration formation and discontinuous precipitation in nickel base superalloys." Diss., Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/19645.

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27

Mignanelli, Paul Michael. "The design of new nickel-base superalloys with high niobium contents." Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.709110.

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28

Mathur, Harshal. "Recrystallisation in single crystal nickel-based superalloys." Thesis, University of Cambridge, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.608207.

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29

Garimella, Narayana. "Multicomponent interdiffusion in austenitic Ni-, Fe-Ni-base alloys and L1₂-Ni₃Al intermetallic for high-temperature applications." Orlando, Fla. : University of Central Florida, 2009. http://purl.fcla.edu/fcla/etd/CFE0002521.

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30

Ibanez, Alejandro R. "Modeling creep behavior in a directionally solidified nickel base superalloy." Diss., Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/5353.

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31

Shi, Shu. "Repair weldability of heat-resistant stainless steel casings-HP45NB, HP50NB and 20-32NB alloys." The Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=osu1140490923.

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32

Lundberg, Daniel, Filip Wilson, Hjalmar Gunnarsson, Leo Sjörén, Robin Xu, and Erik Djurberg. "Long term aging and creep exposure for advanced heat resistant alloys : A phase analysis." Thesis, Uppsala universitet, Institutionen för materialvetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-446407.

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This project was ordered by Sandvik Materials Technology and was performed by a group of students at Uppsala university. The purpose of the project was to study precipitation behavior and structure stability in six advanced heat resistant alloys. Each sample were subjected to a creep rupture test in 600 or 700°C depending on the alloy type. Two parts of each alloy where examined; one part which had been affected by creep and another part which was unaffected by creep. A literature study was performed first to gain knowledge of the scientific theory utilized in this project, namely creep, preci

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33

Tsutsumi, Mitsuyoshi. "FATIGUE AND CREEP FATIGUE BEHAVIOR OF HEAT RESISTANT ALLOYS WITH ANISOTROPIC AND COMPOSITE MICROSTRUCTURES." Kyoto University, 1998. http://hdl.handle.net/2433/182333.

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34

Sulaiman, Samsiah. "Structure of properties of the heat affected zone of P91 creep resistant steel." Access electronically, 2007. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20080916.150054/index.html.

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35

Shenoy, Mahesh M. "Constitutive Modeling and Life Prediction in Ni-Base Superalloys." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/11515.

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Microstructural features at different scales affect the constitutive stress-strain response and the fatigue crack initiation life in Ni-base superalloys. While numerous efforts have been made in the past to experimentally characterize the effects of these features on the stress-strain response and/or the crack initiation life, there is a significant variability in the data with sometimes contradictory conclusions, in addition to the substantial costs involved in experimental testing. Computational techniques can be useful tools to better understand these effects since they are relatively inex

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36

Rzyankina, Ekaterina. "Numerical and experimental investigation of directional solidification in vacuum investment casting of superalloys." Thesis, Cape Peninsula University of Technology, 2013. http://hdl.handle.net/20.500.11838/1243.

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Thesis submitted in fulfilment of the requirements for the degree Master of Technology: Mechanical Engineering in the Faculty of Engineering at the Cape Peninsula University of Technology 2013<br>High temperatures encountered in combustion chambers of jet engines has demanded the creation of new technologies and new materials for the construction of one of the most critical elements of these systems - the stator and rotor turbine blades. They have to withstand extreme temperatures for extended periods without the loss of mechanical strength, conditions under which many steels and alloys fail.

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37

de, Bussac Arnaud. "A study of deformation and fatigue in model Ni-base superalloys." Thesis, Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/20174.

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38

Papangelakis, V. G. (Vladimiros George) 1958. "Aqueous pressure oxidation of arsenopyrite." Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=65435.

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39

Leyland, Steven Paul. "Casting of single crystal nickel superalloys with reactive elements." Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.709416.

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40

Priest, Matthew. "Synthesis of reactive element-modified aluminide coatings on single-crystal Ni-based superalloys by a pack cementation process a thesis presented to the faculty of the Graduate School, Tennessee Technological University /." Click to access online, 2009. http://proquest.umi.com/pqdweb?index=26&did=1760523421&SrchMode=1&sid=1&Fmt=6&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1254926883&clientId=28564.

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41

Ventura, Julieta Angelica. "High temperature oxidation behavior of Nb-20Mo-15Si-5B-20Cr alloy." To access this resource online via ProQuest Dissertations and Theses @ UTEP, 2009. http://0-proquest.umi.com.lib.utep.edu/login?COPT=REJTPTU0YmImSU5UPTAmVkVSPTI=&clientId=2515.

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42

Bradley, Christopher Michael. "Microstructural characterization and heat treatment of A-286 turbine buckets." To access this resource online via ProQuest Dissertations and Theses @ UTEP, 2009. http://0-proquest.umi.com.lib.utep.edu/login?COPT=REJTPTU0YmImSU5UPTAmVkVSPTI=&clientId=2515.

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43

Rajamure, Ravi Shanker. "Laser Surface Alloying of Refractory Metals on Aluminum for Enhanced Corrosion Resistance: Experimental and Computational Approaches." Thesis, University of North Texas, 2014. https://digital.library.unt.edu/ark:/67531/metadc700029/.

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Aluminum (Al) and its alloys are widely used in various technological applications, mainly due to the excellent thermal conductivity, non-magnetic, ecofriendly, easy formability and good recyclability. However due to the inferior corrosion resistance its applications are hampered in various engineering sectors. Besides, the corrosion related failures such as leakage of gas from pipeline, catastrophic breakdown of bridges and fire accidents in processing plants further puts the human life in jeopardy. Within the United States over $ 400 billion dollars per year are spent over research to unders

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44

Amaro, Robert L. "Thermomechanical fatigue crack formation in a single crystal Ni-base superalloy." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/37172.

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This research establishes a physics-based life determination model for the second generation single crystal superalloy PWA 1484 experiencing out-of-phase thermomechanical fatigue (TMF). The life model was developed as a result of a combination of critical mechanical tests, dominant damage characterization and utilization of well-established literature. The resulting life model improves life prediction over currently employed methods and provides for extrapolation into yet unutilized operating regimes. Particularly, the proposed deformation model accounts for the materials' coupled fatigue-envi

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45

Dzebo, Sead. "Investigation of methods to improve process performance in centerless grinding of Inconel 718 and Ti-6Al-4V superalloys." Thesis, Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/37113.

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Grinding is an abrasive machining process used for the final shaping of components that require very smooth surfaces and a high dimensional accuracy. In recent years, the costs of industrial grinding operations have increased with a greater demand for high-strength, low-weight superalloy components. Titanium and nickel-based alloys are desirable for their high creep-rupture strength and corrosion and oxidation resistance in high-temperature environments. However, they are very difficult to grinding due to a combination of poor thermal properties, rapid work-hardening, and a high level of ch

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46

Callender, Chad M. "Refractory metal to nickel-based alloy joining technologies for high temperature applications." Auburn, Ala., 2006. http://repo.lib.auburn.edu/2006%20Summer/Theses/CALLENDER_CHAD_35.pdf.

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47

Godfrey, A. W. "Some studies of the effect of directional recrystallisation on the properties of a powder metallurgy superalloy." Thesis, University of Oxford, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.670275.

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48

Meher, Subhashish. "Comparative Coarsening Kinetics of Gamma Prime Precipitates in Nickel and Cobalt Base Superalloys." Thesis, University of North Texas, 2014. https://digital.library.unt.edu/ark:/67531/metadc699871/.

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The increasing technological need to push service conditions of structural materials to higher temperatures has motivated the development of several alloy systems. Among them, superalloys are an excellent candidate for high temperature applications because of their ability to form coherent ordered precipitates, which enable the retention of high strength close to their melting temperature. The accelerated kinetics of solute diffusion, with or without an added component of mechanical stress, leads to coarsening of the precipitates, and results in microstructural degradation, limiting the durab

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49

Marinescu, Iulian. "Investigation of monitoring techniques for the detection of tool/workpiece malfunctions in milling of heat resistant alloys." Thesis, University of Nottingham, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.537638.

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50

Whelchel, Ricky Lee. "Characterization of a nickel-base superalloy through electrical resistivity-microstructure relationships facilitated by small angle scattering." Thesis, Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/41130.

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Nickel-base superalloys obtain high temperature mechanical properties through formation of precipitate phases formed via heat treatment. The precipitate microstructure evolves with heat treatment or thermal exposure, which can lead to degrading mechanical properties. This project focuses on the use of electrical resistivity as a non-destructive testing method to monitor the precipitate phase in Waspaloy (a polycrystalline nickel-base superalloy). The evolution of the precipitate microstructure is characterized throughout the volume of the specimens using both small angle neutron scattering (SA

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