The Effect of Grain Size on the Brittle-ductile Transition Temperatures of Pure Iron and Some Dilute Iron-tungsten Alloys PDF Download
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Author: Frank George Tahmoush
Publisher:
ISBN:
Category :
Languages : en
Pages : 74
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Author: Frank George Tahmoush
Publisher:
ISBN:
Category :
Languages : en
Pages : 74
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Author: Metallurgical Society of AIME.
Publisher:
ISBN:
Category : Metallurgy
Languages : en
Pages : 1534
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 936
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Author: American Institute of Mining, Metallurgical, and Petroleum Engineers
Publisher:
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Category : Mineral industries
Languages : en
Pages : 812
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Author: William D. Klopp
Publisher:
ISBN:
Category : Liquid metals
Languages : en
Pages : 54
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Author: S. Jin
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ISBN:
Category :
Languages : en
Pages : 22
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The effect of microstructural changes on the ductile-brittle transition temperature (DBTT) was studied in a titanium-gettered Fe-8Ni-2Mn-0.15Ti alloy. A fairly strong grain size dependence of the transition temperature was found. Grain size refinement from approximately 38 micrometers (ASTM No. 6.5) to approximately 1.5 micrometers (ASTM No. 15.5) through a four-step thermal treatment lowered the transition temperature by approximately 162C. A small amount of retained austenite was introduced to this grain-refined microstructure, and the transition temperature was suppressed by an additional 100 approximately 150C. The suppression of the DBTT due to retained austenite was smaller when introduced into a large grained structure (approximately 64C). The distribution and stability of retained austenite were also studied.
Author: Metallurgical Society of AIME.
Publisher:
ISBN:
Category : Mineral industries
Languages : en
Pages : 1532
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Author: F. R. Schwartzberg
Publisher:
ISBN:
Category : Brittleness
Languages : en
Pages : 86
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Author:
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Category : Cast-iron
Languages : en
Pages : 936
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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,
