Mechanical Properties and Fracture Behavior of Tungsten-base Alloys PDF Download
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Author: Anhua Luo
Publisher:
ISBN:
Category : Fracture mechanics
Languages : en
Pages : 364
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Book Description
Author: Anhua Luo
Publisher:
ISBN:
Category : Fracture mechanics
Languages : en
Pages : 364
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 39
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Book Description
The influence of microstructure on fracture behavior and tensile properties was investigated for two tungsten heavy alloys (93W-4.9Ni-2.1Fe and 91W-6Ni-3Co by weight-percentage) that are suitable materiai candidates for use as kinetic energy penetrators. Both alloys were evaluated in swaged and aged conditions. For comparable levels of swaging and aging, the W-Ni-Co alloy exhibited increased tensile strength and ductility compared to the W-Ni-Fe material. The W-Ni-Co alloy had a smaller average W grain size and a larger percentage of W in the matrix. Fracture surfaces of failed uniaxial tensile specimens tested at quasi-static and low-to-medium strain rates were characterized using scanning electron microscopy. The results indicate a strong relationship between microstructure, fracture behavior, and tensile properties as a function of alloy composition and strain rate. (MM).
Author: Union Carbide Metals Company. Metals Research Laboratories
Publisher:
ISBN:
Category : Tungsten
Languages : en
Pages : 110
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 9
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Book Description
An investigation of the stress-strain response as a function of strain rate, spall strength, and dynamic fracture behavior of pure W, W-26Re, W-Ni-Fe and W-Ni-Fe-Co has been performed. Spall strength measurements, obtained in symmetric-impact tests, showed an increase in spall strength from 0.4 GPa for pure tungsten to 3.8 GPa for 90W- 7Ni-3Fe. Concurrent with increase in spall strength was a change in fracture mode from cleavage (for pure W) to a mixture of transgranular and intergranular fracture for the alloyed systems. Compression testing performed at strain rates from 10ā3 sā1 to 3000 sā1 showed that pure tungsten exhibits a large strain rate sensitivity and almost no work hardening at tested strain rates. In contrast, W-26Re and W-Ni-Fe-Co displayed significant work hardening at all strain rates. 12 refs., 5 figs. 2 tabs.
Author: William D. Klopp
Publisher:
ISBN:
Category : Liquid metals
Languages : en
Pages : 42
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Book Description
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: Westinghouse Electric Corporation. Westinghouse Lamp Division
Publisher:
ISBN:
Category : Tungsten
Languages : en
Pages : 458
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Book Description
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 702
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Author: J. L. Ratliff
Publisher:
ISBN:
Category : Heat resistant alloys
Languages : en
Pages : 32
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Book Description
Author:
Publisher:
ISBN:
Category : Nuclear energy
Languages : en
Pages : 1018
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Book Description
Author: Lujun Huang
Publisher: Springer
ISBN: 981104449X
Category : Technology & Engineering
Languages : en
Pages : 181
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Book Description
This book introduces readers to titanium matrix composites (TMCs) with novel network microstructures. The bottleneck problem of extreme brittleness and low strengthening effect surrounding TMCs fabricated by means of powder metallurgy has recently been solved by designing network microstructures, which yield both high strength and superior ductility. As such, network structured TMCs will increasingly offer materials characterized by low weight, high strength, high temperature resistance and superior deformability. The book systematically addresses the design, fabrication, microstructure, properties, modification, and toughening mechanisms of these composites, which will help us find innovative solutions to a range of current and future engineering problems.
