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Author:
Publisher:
ISBN:
Category : Nuclear energy
Languages : en
Pages : 1018
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Author:
Publisher:
ISBN:
Category : Nuclear energy
Languages : en
Pages : 1018
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Book Description
Author: Radim Kocich
Publisher: MDPI
ISBN: 3036500766
Category : Technology & Engineering
Languages : en
Pages : 256
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Book Description
The demands on innovative materials given by the ever-increasing requirements of contemporary industry require the use of high-performance engineering materials. The properties of materials and alloys are a result of their structures, which can primarily be affected by the preparation/production process. However, the production of materials featuring high levels of the required properties without the necessity to use costly alloying elements or time- and money-demanding heat treatment technologies typically used to enhance the mechanical properties of metallic materials (especially specific strength) still remains a challenge. The introduction of thermomechanical treatment represented a breakthrough in grain refinement, consequently leading to significant improvement of the mechanical properties of metallic materials. Contrary to conventional production technologies, the main advantage of such treatment is the possibility to precisely control structural phenomena that affect the final mechanical and utility properties. Thermomechanical treatment can only decrease the grain size to the scale of microns. However, further research devoted to pushing materials’ performance beyond the limits led to the introduction of severe plastic deformation (SPD) methods providing producers with the ability to acquire ultra-fine-grained and nanoscaled metallic materials with superior mechanical properties. SPD methods can be performed with the help of conventional forming equipment; however, many newly designed processes have also been introduced.
Author: William D. Klopp
Publisher:
ISBN:
Category : Liquid metals
Languages : en
Pages : 42
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A study has been conducted of the properties of tungsten fabricated from three ingots consolidated by electron-beam melting. The study included purity as a function of number of melts, recrystallization a d grain growth behavior, low-temperature ductility, and high-temperature tensile and creep strength. The level of most metallic impurities in tungsten decreased with increasing number of electron-beam melts, the reduction being greatest for aluminum, iron, nickel, and silicon. The levels of interstitial impurities generally were not affected by remelting. Resistivity ratios for single crystals machined from ingot slices tended to increase on remelting. The recrystallization rates for worked, electron-beam- melted (EB-melted) tungsten were significantly higher than those observed earlier for arc-melted tungsten. The grain growth rates of EB-melted tungsten were higher than those reported previously for arc-melted tungsten, further reflecting the higher purity of the EB-melted materials. The activation energies for both recrystallization and grain growth in EB-melted tungsten were consistent with expected values assuming grain boundary self-diffusion to be the rate-controlling reaction. The ductile-brittle bend transition temperature for EB-melted tungsten is slightly higher in the worked condition than that reported for arc-melted tungsten. In the recrystallized conditions, the transition temperatures for EB- and arc-melted tungsten are similar. The tensile strength of EB-melted tungsten at 2500 to 4000 F is less than that of arc-melted tungsten. This is partly associated with the large grain size of EB-melted tungsten. However, when compared at the same grain size,
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 702
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Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 782
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Book Description
Author: Shashanka Rajendrachari
Publisher: Elsevier
ISBN: 0443161526
Category : Technology & Engineering
Languages : en
Pages : 388
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Book Description
This book provides an in-depth exploration of ferrous and non-ferrous alloys including various methods of preparation and production, their mechanical properties, and applications. The advantages of the mechanical alloying processing approach over other traditional powder metallurgical techniques is explained as are which alloys are best suited for this technique. Preparation steps, microstructures, properties, and applications for ferrous and non-ferrous alloys are compared, with insight on which alloys are best suited for preparation by alloying. The advantages and disadvantages of wet and dry milling are outlined. Processing, properties, and applications of high entropy alloys, ODS stainless steel, shape memory alloys, cermets, iron, copper, zinc, tungsten, aluminum, titanium, magnesium, and ceramic-based alloys are also covered, as are different powder preparation techniques and sintering methods. - Outlines the different types of mechanical alloying used to prepare powders, their mechanisms, factors affecting the process, and more - Covers the manufacturing, characteristics, and applications of high entropy alloys, ODS stainless steel, shape memory alloys, magnesium, ceramic-based alloys, and more - Compares preparation of ferrous and non-ferrous alloys, their microstructures, and properties - Discusses the advantages and disadvantages of wet and dry milling
Author:
Publisher: ASTM International
ISBN:
Category :
Languages : en
Pages : 481
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Author: United States. Energy Research and Development Administration
Publisher:
ISBN:
Category : Medicine
Languages : en
Pages :
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Author: United States. Energy Research and Development Administration
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 716
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Book Description
Author:
Publisher:
ISBN:
Category : Nuclear reactors
Languages : en
Pages : 320
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Book Description
