Physical Metallurgy Of Tungsten And Tungsten Base Alloys
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Report Number: WADD TR 60-37 Part II
Author(s): Sell, Heinz G., Keith, George H., Koo, Ronald C., Schnitzel, Randolph H., Corth, Richard
Corporate Author(s): Westinghouse Electric Corporation
Laboratory: Directorate of Materials and Processes
Date of Publication: 1961-06
Pages: 143
Contract: AF 33(616)-6933
DoD Project: 7351 - Metallic Materials
DoD Task: 73512
Identifier: AD0266330
Abstract:
In continuation of previous contract AF 33(616)-5632 on tungsten and tungsten base alloys, fundamental properties of high purity tungsten produced both by powder metallurgy techniques and, in the form of single crystals, by electron beam zone melting were studied. High temperature properties of several dispersed second-phase tungsten base alloys were also investigated.Additional base line data on the metallurgical properties of pure tungsten for temperatures above 2500°F were also obtained. The mechanism of purification in tungsten during zone melting was studied in order to understand the formation of pores and the effect of pores on growth variables. The flow and fracture characteristics of tungsten single crystal tensiles were investigated as functions of annealing temperature and atmosphere. Internal friction measurements were carried out at 20 to 800°C on high purity and dosed polycrystalline tungsten wires and single crystals of tungsten. Internal friction damping peaks were tentatively identified to be due to carbon and oxygen. Methods of dosing interstitials into tungsten were further explored.The mechanical properties of dispersed second-phase tungsten base alloys such as W-ThO2, W-TaC and W-HfO2 were studied at temperatures above 2500° F. Previously obtained results on the high temperature strength of the alloys W-ThO2 and W-TaC were confirmed, and it was found that these alloys retain their margin of strength over that of pure tungsten even at 3000°F.A theoretical investigation of the elastic properties of tungsten and other b.c.c. metals in relationship to the ductile-brittle transition was initiated, and background information was compiled and analyzed
Provenance: Lockheed Martin Missiles & Fire Control
Author(s): Sell, Heinz G., Keith, George H., Koo, Ronald C., Schnitzel, Randolph H., Corth, Richard
Corporate Author(s): Westinghouse Electric Corporation
Laboratory: Directorate of Materials and Processes
Date of Publication: 1961-06
Pages: 143
Contract: AF 33(616)-6933
DoD Project: 7351 - Metallic Materials
DoD Task: 73512
Identifier: AD0266330
Abstract:
In continuation of previous contract AF 33(616)-5632 on tungsten and tungsten base alloys, fundamental properties of high purity tungsten produced both by powder metallurgy techniques and, in the form of single crystals, by electron beam zone melting were studied. High temperature properties of several dispersed second-phase tungsten base alloys were also investigated.Additional base line data on the metallurgical properties of pure tungsten for temperatures above 2500°F were also obtained. The mechanism of purification in tungsten during zone melting was studied in order to understand the formation of pores and the effect of pores on growth variables. The flow and fracture characteristics of tungsten single crystal tensiles were investigated as functions of annealing temperature and atmosphere. Internal friction measurements were carried out at 20 to 800°C on high purity and dosed polycrystalline tungsten wires and single crystals of tungsten. Internal friction damping peaks were tentatively identified to be due to carbon and oxygen. Methods of dosing interstitials into tungsten were further explored.The mechanical properties of dispersed second-phase tungsten base alloys such as W-ThO2, W-TaC and W-HfO2 were studied at temperatures above 2500° F. Previously obtained results on the high temperature strength of the alloys W-ThO2 and W-TaC were confirmed, and it was found that these alloys retain their margin of strength over that of pure tungsten even at 3000°F.A theoretical investigation of the elastic properties of tungsten and other b.c.c. metals in relationship to the ductile-brittle transition was initiated, and background information was compiled and analyzed
Provenance: Lockheed Martin Missiles & Fire Control