Spelling suggestions: "subject:"fetals - heat treatment"" "subject:"fetals - meat treatment""
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Characterisation and evolution of the grain boundary network in BCC metalsWaterton, Michael January 2013 (has links)
No description available.
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Heat treatment of cast Co-Cr-Mo-C surgical implant alloys.Coke, James Richard January 1975 (has links)
Thesis. 1975. M.S.--Massachusetts Institute of Technology. Dept. of Materials Science and Engineering. / Includes bibliographical references. / M.S.
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Quantitative characterization of thermophysical properties in computational heat transferIyer, Kaushik A. 07 1900 (has links) (PDF)
M.S. / Materials Science and Engineering / The most fundamental step in the development of a predictive model for microstructure and residual stress distribution in steels is the accurate representation of the transient temperature field. Three constituents of a database of thermophysical properties, namely the thermal conductivity, volumetric specific heat capacity and convective heat transfer coefficient, were isolated and their effects quantified on the accuracy of temperature field predictions using finite element analysis (FEA). The most critical parameter in the heat transfer process was ultimately identified to be the temperature dependent convective heat transfer coefficient. It was determined using an inverse heat transfer method, which was successfully applied to accurately establish the thermal boundary conditions for an arbitrary 3D steel geometry. The temperature dependency of the volumetric specific heat capacity in the transformation range of temperatures has to be known a priori, for which a reliable model describing alloy dependent reaction kinetics has to be developed first. Thermal conductivity and its dependency on temperature have secondary effects on the accuracy of FEA predictions. The impact of the outcome of this study lies in its relevance to the heat treatment industry.
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The strengthening effect of hot work subgrains.Kosik, O. To January 1970 (has links)
No description available.
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Design and fabrication of a quench-furnance for the Instron tensile test instrumentHolley, William Gaither 05 1900 (has links)
No description available.
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A study of the fracture mechanism of three aluminum-copper alloys in the region of the solidusGrondin, James Frederick 05 1900 (has links)
No description available.
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Surface integrity and tool performance in the turning of hardened steelGaléa, Vincent 05 1900 (has links)
No description available.
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Deformation of some aluminum-copper alloys in the region of the solidusTalbot, Thomas Fletcher 08 1900 (has links)
No description available.
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The strengthening effect of hot work subgrains.Kosik, O. To January 1970 (has links)
No description available.
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Investigation of carburisation methods for improved internal gear performanceLakay, Lorinda January 2016 (has links)
A research report submitted to the Faculty of Engineering and the Built Environment, University of the Witwatersrand, Johannesburg, in partial fulfilment of the requirements for the degree of Masters of Science in Engineering.
University of the Witwatersrand, Johannesburg, 2016 / With the current tough economic times and depressed commodity prices, focus is being placed on achieving higher power densities in gears without increased cost or reduced achievable life and reliability. An investigation into the use of different carburisation methods and processes to minimise post heat treatment distortion, with the aim to reduce and even eliminate the requirement for post heat treatment grinding and grinding stock allowances is presented. The investigation included the processing of test pieces, as per the recommendations of AGMA 2004-B89: Gear Materials, Heat Treatment and Processing Manual. Four alloy steels, namely AISI 3310, AISI 8620, AISI 9310 and 17CrNiMo6, were selected for this research, based on availability, cost and hardenability. The carburising cycles were derived for both gas and vacuum carburising for a 0.10% and 0.20% carbon steel respectively. Two quenching options were applied, oil quenching and intensive quenching. The test pieces were 3-dimensionally measured to determine distortion through the changes in diameter and ovality. The microstructures of the case and core were analysed, as well as effective case depth. This research found that current methods, atmospheric carburising and oil quenching, and steel alloy combinations are inadequate to produce low distortion carburised internal gears, while the use of vacuum carburising and intensive quenching as a process combination can achieve such gears. It was also found that the use of AISI 3310, performed the best for both current and proposed process combinations. It is recommended that future work be conducted, including a full-scaled manufacturing trial with more detailed process adjustments to ensure the quality and repeatability of the final carburised gear. / MT2017
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