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Dissertations / Theses on the topic 'Powder forging'

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Published: 4 June 2021

Last updated: 1 February 2022

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1

Jiang, Jiaying. "Development of direct powder forging process." Thesis, Imperial College London, 2017. http://hdl.handle.net/10044/1/55887.

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Direct powder forging (DPF) is an innovative powder metallurgy (PM) process that aims to manufacture nickel-based superalloy components within a very short time, compared with current hot isostatic pressing (HIPing) and other processes, by applying high temperature and pressure to metal powders. DPF process has been proposed to reduce the microstructural defects, e.g. prior particle boundaries (PPBs), possessed by the conventional HIPing process and achieve considerably high production efficiency with low cost and energy saving. The aim of this project is to study the powder consolidation and

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2

Ashraf, Mufti Mohmed. "The application of rotary forging technique to powder metal compaction." Thesis, City University London, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361856.

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3

Bindas, Erica Bindas. "EFFECT OF TEMPERATURE, STRAIN RATE, AND AXIAL STRAIN ON DIRECT POWDER FORGED ALUMINUM-SILICON CARBIDE METAL MATRIX COMPOSITES." Case Western Reserve University School of Graduate Studies / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=case1530871866585058.

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4

Abosbaia, Alhadi A. S. "Design and processing of low alloy high carbon steels by powder metallurgy. P/M processing and liquid phase sintering of newly designed low-alloy high carbon steels based on Fe-0.85Mo-C-Si-Mn with high toughness and strength." Thesis, University of Bradford, 2010. http://hdl.handle.net/10454/4857.

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The work presented has the ultimate aim to increase dynamic mechanical properties by improvements in density and optimisation of microstructure of ultra high carbon PM steels by careful selection of processes, i.e. mixing, binding, alloying, heating profile and intelligent heat treatment. ThermoCalc modelling was employed to predict liquid phase amounts for two different powder grades, Astaloy 85Mo or Astaloy CrL with additive elements such as (0.4-0.6wt%)Si, (1.2-1.4wt%)C and (1-1.5wt%)Mn, in the sintering temperature range 1285-1300ºC and such powder mixes were pressed and liquid phase sinte

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5

Abosbaia, Alhadi Amar Salem. "Design and processing of low alloy high carbon steels by powder metallurgy : P/M processing and liquid phase sintering of newly designed low-alloy high carbon steels based on Fe-0.85Mo-C-Si-Mn with high toughness and strength." Thesis, University of Bradford, 2010. http://hdl.handle.net/10454/4857.

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The work presented has the ultimate aim to increase dynamic mechanical properties by improvements in density and optimisation of microstructure of ultra high carbon PM steels by careful selection of processes, i.e. mixing, binding, alloying, heating profile and intelligent heat treatment. ThermoCalc modelling was employed to predict liquid phase amounts for two different powder grades, Astaloy 85Mo or Astaloy CrL with additive elements such as (0.4-0.6wt%)Si, (1.2-1.4wt%)C and (1-1.5wt%)Mn, in the sintering temperature range 1285-1300ºC and such powder mixes were pressed and liquid phase sinte

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6

Arbak, Murat [Verfasser], Marion [Akademischer Betreuer] Merklein, Marion [Gutachter] Merklein, et al. "Material Adapted Design of Cold Forging Tools Exemplified by Powder Metallurgical Tool Steels and Ceramics / Murat Arbak ; Gutachter: Marion Merklein, A. Erman Tekkaya ; Betreuer: Marion Merklein ; Herausgeber: Marion Merklein, Jörg Franke, Manfred Geiger, Michael Schmidt." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2012. http://d-nb.info/118517107X/34.

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7

Garba, Haruna Bala. "The closed die forging of Al-5Cr-2Zr-1Mn powders." Thesis, Imperial College London, 1991. http://hdl.handle.net/10044/1/46778.

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8

Alken, Martha. "The healing power of forgiving." Theological Research Exchange Network (TREN) Access this title online Theological Research Exchange Network (TREN), 1995. http://www.tren.com.

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9

Kenealy, Daniel Peter. "Protected and confederated : power politics and the forging of European Union." Thesis, University of Edinburgh, 2012. http://hdl.handle.net/1842/8182.

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This thesis explores the origins and evolution of European integration through the lens of classical realism. Classical realism, as an approach to International Relations, has had little to say about one of the most fascinating and politically important developments in the post-war international system, namely the effort by Western European states to integrate economically from the 1950s onwards. Grounded in classical realism’s ontology of power and the desire by states to secure autonomy and exert influence in the international system the thesis argues that a combination of military power, ec

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10

Kalinowski, Piotr. "Recrystallisation and grain size development during forging in power generation steels." Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7921/.

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Martensitic 9-12%Cr-based creep-resistant steels are currently employed in a number of power generation applications as a cheaper substitute for the more expensive Ni-based superalloys. A tempered martensite microstructure with a uniform, fine prior austenite grain size is desired to give the required strength and creep-resistant properties at service entry. Refinement of austenite grain size can be achieved via recrystallisation. During hot opendie forging of high-volume rotor discs utilised in power plants non-uniformities of parameters determining austenite grain size, such as temperature,

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11

Slobodchikoff, Michael O. "Overcoming Inequality and Suspicion: Forging Interstate Cooperation Despite Mistrust and Power Asymmetry." Diss., The University of Arizona, 2012. http://hdl.handle.net/10150/228613.

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Power inequalities and mistrust have characterized many interstate relationships. Yet most international relations theories do not take into account power and mistrust when explaining cooperation. While some scholars argue that power relations inhibit cooperation between states, other scholars expect interstate cooperation regardless of the power relations and level of trust. I argue that although states benefit from cooperation, they are also wary of the power relations between states, making cooperation difficult. Successful and cooperative bilateral relationships are formed between strong a

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12

Murphy, John T. "Overheating of low-allow forging steels for nuclear power plant rotors and vessels." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/37531.

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13

Watson, Christopher. "Modelling high integrity steel forgings for turbine applications in the power generation industry." Thesis, University of Birmingham, 2015. http://etheses.bham.ac.uk//id/eprint/5990/.

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This study involved the characterisation of a newly developed 9%CrMoCoVNbNB (FB2) martensitic creep resistant steel for use in large industrial turbine disc and shaft components. A major part of the work involved characterisation of FB2 with incorporation of material, thermal and physical data into a finite element-based model for the simulation of coupled thermo-mechanical working with consideration of grain size evolution based on the implementation of a user sub-routine within the FEM code (QForm). The main focus of the research was to gain a comprehensive understanding of the non-uniform t

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14

Limberger, Rodrigo Prestes. "Estudo do forjamento de eixos vazados com contorno interno para utilização em aerogeradores." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2015. http://hdl.handle.net/10183/139351.

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Esse trabalho propõe a investigação da geometria dos contornos internos de eixos vazados para aerogeradores quando aplicados mandris com diferentes diâmetros ao longo de seu comprimento no forjamento incremental em matriz aberta. Tem-se por finalidade a fabricação de um mandril que proporcione à peça forjada formato mais perto do formato final proposto. Foram estudados através do uso de simulações numéricas computacionais com o software Simufact.forming 12 e ensaios com o material modelo plasticina possíveis geometrias de mandris, variando a angulação na região de troca de diâmetros ao longo d

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15

Drew, D. "New Labour in power in the English countryside 1997-2010 : a social democratic moment forgone?" Thesis, University of the West of England, Bristol, 2017. http://eprints.uwe.ac.uk/29502/.

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An unprecedented number of Labour MPs was elected in rural areas in England in 1997. This study examines critically examines the making of rural policy and the implications for rural politics over the life-time of New Labour in power between 1997 and 2010. The analysis begins by evaluating New Labour’s representative role in the countryside after the 1997 election and considering the basis for the party’s claim that it represented rural areas. It then provides a critical assessment of how the New Labour governments operated in relation to the countryside, setting out frames within which to ana

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16

chia-hsun, wu, and 吳佳勳. "Study of the Wear Mechanism between Powder Forging materials and UHMWPE." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/59849094262205691864.

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碩士<br>國立臺灣大學<br>機械工程學研究所<br>88<br>Ultra high molecular weigh polyethylene (UHMWPE) is often used in the knee prostheses to be a support. The life of knee prostheses always depends on wear performance of UHMWPE. In this study by powder forging products were prepared and simulated the femur in the knee joint rubbing with the UHMWPE support. We want to control metal material behavior to extend the life of UHMWPE. The materials we used were 316L stainless steel and TI-6Al-4V. It was found that UHMWPE contacting with a low Young’s modulus material made from powder forging resulted in low

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17

HSIEH, YEN-TA, and 謝沇達. "Fabrication of Micro Copper Parts by Forging Process Combined with Powder Pressing." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/5b4ew8.

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碩士<br>國立高雄應用科技大學<br>模具工程系<br>106<br>Micro metal parts have been used in many applications including electronic products, medical devices, precision instruments, and automobiles. The parts may be produced by micro milling, micro electrical discharge machining, micro metal forming, metal complex shapes, require high precision, and consist of different materials that are not compatible in molten state and difficult to fabricate by conventional methods. Moreover, there are difficulties on the handling, adjustment and assembling of micro parts. To meet these challenges, new processes for fabricatin

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18

Hsieh, Ming-chieh, and 謝名傑. "Study of the Powder Forging temperature effects on the performance of Al-Cr target." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/84wqpm.

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19

Huang, Cheng-Chao, and 黃承照. "Fracture Prediction and Preform Shape Design in Powder Forging Applications with A New Forming-Limit Criterion." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/96183504368944209222.

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博士<br>國立臺灣大學<br>機械工程學研究所<br>90<br>This research is concerned with the applications of powder forging (P/F) technology to the analysis of forming problems associated with porous materials. The primary purpose of the present work is to investigate the forging limit of sintered compacts by developing a new workability criterion to exactly consider the effects of void evolution in the process. The most important concept is the connection of experiments and finite element simulations to examine fracture mechanisms of sintered materials. The new fracture criterion for porous media is deve

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20

Wang, Wen-Yan, and 王文彥. "A Study of the Powder Forging Process on the Slide Block in Car Air Conditioner Compressor." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/80829427073238760165.

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碩士<br>國立高雄第一科技大學<br>機械與自動化工程所<br>94<br>ABSTRACT Powder forging process is one of the near net shape processes, which is the hybrid process of sintering and forging. The advantages of this process are high yield ratio, precision in dimension, little machining amount, less stages, saving energy, low forging load, longer die life and easy to automation. So, this process is with the value in the industry. In this study, the powder forging process of HF4 alloy steel powders is developed by using the slide block of air compressor in the car as the vehicle. The fully dense and near net shape billets

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21

Lenz, Michael. "The Business Community and the Forging of Political Consensus Against the Clinton Healthcare Security Act of 1994." 2010. https://scholarworks.umass.edu/open_access_dissertations/213.

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My research provides an insider's view of how political consensus is formed within the business community. More specifically, my research sheds light on the sociological processes of political mobilization within the business community against the Clinton Health Security Act of 1994. In this study, I build off Jill Quadagno's stakeholder thesis which largely attributes the defeat of the healthcare reform effort to the political mobilization of anti-healthcare business forces. I probe Quadagno's thesis a bit deeper in this study by exploring how conflicting business forces resolved policy disag

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22

金武, 直幸, 眞. 小橋 та 博仁平. "金属基複合材料の部分使用に適した固相接合・複合プロセスの開発". 1999. http://hdl.handle.net/2237/13076.

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