Observations on Delayed Cracking in Welded Structures of Unalloyed Titanium Sheet PDF Download
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Author: R. H. Ernst
Publisher:
ISBN:
Category : Titanium
Languages : en
Pages : 12
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Book Description
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).
Author: R. H. Ernst
Publisher:
ISBN:
Category : Titanium
Languages : en
Pages : 12
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Book Description
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).
Author: J. D. Jackson
Publisher:
ISBN:
Category : Aluminum alloys
Languages : en
Pages : 22
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Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 1076
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1108
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Author: E. S. Bartlett
Publisher:
ISBN:
Category : Heat resistant materials
Languages : en
Pages : 26
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Author: E. S. Bartlett
Publisher:
ISBN:
Category : Refractory materials
Languages : en
Pages : 26
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Book Description
This memorandum summarizes information on refractory materials and composites as presented at the Eighth Meeting of the Refractory Composites Working Group in Fort Worth, Texas, January 14-16, 1964. This memorandum is based on 45 papers covering a wide variety of subjects ranging from basic studies on oxidation mechanisms to the development of specific pieces of hardware. The papers are reviewed and discussed briefly within the framework of the following four broad areas: materials technology, process technology, specific hardware applications, and evaluation techniques. Included in the section on materials technology are discussions dealing with bulk refractory materials and coatedmetal systems. Hot spraying, chemical vapor deposition, powder processes, joining, and extrusion are discussed in the section on process technology. The specific hardware applications cover rocket-motor components, nose caps, leading edges, hot skins, and fasteners. (Author).
Author: Albert M. Hall
Publisher:
ISBN:
Category : Maraging steel
Languages : en
Pages : 26
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Author: Battelle Memorial Institute. Defense Metals Information Center
Publisher:
ISBN:
Category : Alloys
Languages : en
Pages : 38
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Author: Stanley W. Porembka
Publisher:
ISBN:
Category : Beryllium
Languages : en
Pages : 18
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Book Description
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.
Author: J. A. VanEcho
Publisher:
ISBN:
Category : Cobalt alloys
Languages : en
Pages : 34
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