Notes on Large-size Furnaces for Heat Treating Metal Assemblies

Notes on Large-size Furnaces for Heat Treating Metal Assemblies PDF Author: H. J. Hucek
Publisher:
ISBN:
Category : Metallurgical furnaces
Languages : en
Pages : 16

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Notes on Large-size Furnaces for Heat Treating Metal Assemblies

Notes on Large-size Furnaces for Heat Treating Metal Assemblies PDF Author: H. J. Hucek
Publisher:
ISBN:
Category : Metallurgical furnaces
Languages : en
Pages : 16

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Notes on Large-size Furnaces for Heat Treating Metal Assemblies

Notes on Large-size Furnaces for Heat Treating Metal Assemblies PDF Author: H. J. Hucek
Publisher:
ISBN:
Category : Metallurgical furnaces
Languages : en
Pages : 18

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Surface Damage in Machined Beryllium

Surface Damage in Machined Beryllium PDF Author: Stanley W. Porembka
Publisher:
ISBN:
Category : Beryllium
Languages : en
Pages : 18

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A review of machining damage effects in beryllium was made. Surface damage is caused by twinning and microcracking as a result of various machining operations. Twinning is a result of surface working while microcracks initiate at intersections of twins and grain boundaries, at twin-matrix interfaces, at impurity particles, and in heavily twinned regions. These phenomena may be due to residual stresses in wrought products as well as machining parameters such as tool type, feed, and speed and depth of cut. The loss of mechanical properties due to machining damage is reviewed. Also presented is a study of surface damage actually encountered with machining of the shingles for the Gemini spacecraft.

The Production of Powder-metallurgy Tungsten Sheet and Plate

The Production of Powder-metallurgy Tungsten Sheet and Plate PDF Author: D. J. Maykuth
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ISBN:
Category : Powder metallurgy
Languages : en
Pages : 18

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Porosity in Titanium Welds

Porosity in Titanium Welds PDF Author: Robert Melvin Evans
Publisher:
ISBN:
Category : Porosity
Languages : en
Pages : 14

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Porosity in fusion welds in titanium has been encountered to some extent in all programs using this joining method. While measures to control cleanliness and to employ good welding techniques have successfully reduced the occurrence of porosity, specific indentification of the various causes of porosity is still lacking. Some factors suspected of causing porosity in titanium welds are hydrogen, cleanliness of joint area, contamination in filler wire, and welding procedures and techniques.

Mechanical and Physical Properties of Three Superalloys - MAR-M200, MAR-M200, MAR-302, and MAR-M322

Mechanical and Physical Properties of Three Superalloys - MAR-M200, MAR-M200, MAR-302, and MAR-M322 PDF Author: J. A. VanEcho
Publisher:
ISBN:
Category : Cobalt alloys
Languages : en
Pages : 34

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Observations on Delayed Cracking in Welded Structures of Unalloyed Titanium Sheet

Observations on Delayed Cracking in Welded Structures of Unalloyed Titanium Sheet PDF Author: R. H. Ernst
Publisher:
ISBN:
Category : Titanium
Languages : en
Pages : 12

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A brief study of delayed fracture in a seam-welded titanium panel is summarized in this memorandum. Examination of the fracture surface with electron microscopy showed that the material cleaved, failing in a brittle manner. Although the nature of the embrittlement was not clearly defined, titanium hydride phase was suspected as a prime contributor to failure. Even though the hydrogen content of the titanium was only 65 ppm, hydride embrittlement was thought to have occurred from precipitation of hydride platelets on crystal planes oriented normal to welding stresses. Other work, briefly discussed in the memorandum, has confirmed that hydride platelets in titanium can be oriented by stress and that tensile ductility of Zircaloy (which behaves similarly with respect to hydrogen, to titanium) depends upon hydride orientation. Stress-relief annealing of welded titanium structures is recommended wherever possible to minimize embrittlement by stress-oriented hydrides. (Author).

Continued Observations on the Distribution of Stress in the Vicinity of a Crack in the Center of a Plate

Continued Observations on the Distribution of Stress in the Vicinity of a Crack in the Center of a Plate PDF Author: L. R. Jackson
Publisher:
ISBN:
Category : Plates (Engineering)
Languages : en
Pages : 50

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This memorandum supplements and augments information presented in DMIC Memorandum 178 (AD-422 463). In the present report, Neuber's stress equations are rewritten entirely in rectangular coordinates. In addition, numerical results have been extended to include the stress distribution around an indefinitely sharp crack. It is also shown that the stress function used in a British work for an indefinitely sharp crack yielded identical numerical results, even though the stress function was of a different type than that employed by Neuber. The Von Mises relation was chosen to delineate the area around a crack in which plastic flow is occurring. The numerical tables in this memorandum give values for the function of plane stress as well as one possible interpretation of plane strain. Values of the hydrostatic stress variant are also given for both plane stress and plane strain. (Author).

Report on the Fourth Maraging-steel Project Review

Report on the Fourth Maraging-steel Project Review PDF Author: Albert M. Hall
Publisher:
ISBN:
Category : Maraging steel
Languages : en
Pages : 26

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A Review and Comparison of Alloys for Future Solid-propellant Rocket-motor Cases

A Review and Comparison of Alloys for Future Solid-propellant Rocket-motor Cases PDF Author:
Publisher:
ISBN:
Category : Alloys
Languages : en
Pages : 50

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