A Study of the Effects of Stress on Strain Aging in Vanadium and Tantalum PDF Download
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Author: Linda Priscilla Beckerman
Publisher:
ISBN:
Category : Tantalum
Languages : en
Pages : 394
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Author: Linda Priscilla Beckerman
Publisher:
ISBN:
Category : Tantalum
Languages : en
Pages : 394
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Author: George H. Keith
Publisher:
ISBN:
Category : Vanadium
Languages : en
Pages : 34
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Author: R. E. Reed-Hill
Publisher:
ISBN:
Category :
Languages : en
Pages : 35
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Book Description
The phenomena of slow strain-rate embrittlement was studied in three metal-interstitial systems, tantalum-oxygen, vanadium-oxygen and tantalum-nitrogen. The embrittlement of tantalum by oxygen was investigated on specimens containing four levels of oxygen -- 0.33, 0.50, 0.85 and1.30 atomic percent. All of the compositions showed embrittlement between 500-1000K in specimens deformed at epsilon = 8.8 x 10 to the 4th power sec to the minus one power. Associated with the embrittling phenomenon, and occurring in the same temperature range where the ductility is dropping, and three dynamic strain-aging effects: (a) a yield stress plateau from 300-600K, (b) serrated yielding from 453-600K and an increasing work hardening rate from 300-600K; Scanning electron microscope studies show that failures were by microvoid coalescence at low temperatures changing to a predominantly intergranular mode in the embrittlement range. Study of the vanadium-oxygen system also showed an embrittlement region between 600-875K. This embrittlement was accompanied by a yield stress plateau between 400-600K, an increasing work hardening rate between 300-650K and serrated yielding from 525K to 650K. A high level of titanium impurity limited testing to low oxygen concentrations. Tests on the tantalum-nitrogen system concluded that nitrogen did not produce slow strain-rate embrittlement in this metal although it served as a potent room temperature strengthener. The interval in which embrittlement is expected in this metal is at a sufficiently high temperature that dynamic recovery and sofening take place. (Author).
Author:
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Category : Aeronautics
Languages : en
Pages : 1370
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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: Robert Wayne Thompson
Publisher:
ISBN:
Category : Nitrogen
Languages : en
Pages : 98
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Author: Krijn Jacobus Reitsma
Publisher:
ISBN:
Category : Tantalum
Languages : en
Pages : 166
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Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 764
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Author: D. Y. Wang
Publisher:
ISBN:
Category : Tantalum
Languages : en
Pages : 27
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A study has been made of the fatigue of commercially pure polycrystalline tantalum under axial loading with zero mean stress. A wrought stress-relieved tantalum material and two recrystallized materials, each having different interstitial impurity element contents, were tested at room temperature; also a recrystallized material was tested at an elevated temperature in an argon gas environment. In addition, surface metallographic observations of the mode of surface crack initiation were made. Tests of specimens representing all three conditions indicated the existence of a definite fatigue limit, similar to that of medium to low strength steel. The variation of the fatigue limit and the knee position is influenced by the test temperature and may be predicted by temperature-dependent mobility of the interstitial atom in diffusion. The experimental results appear to confirm the previously proposed theory that the fatigue limit of a body-centered-cubic metal is attributable to the manifestion of strain aging occurring during alternating stressing. An analysis was made to show the effect of strain aging on ftigue as a function of the test temperature and interstitial content, taking into consideration the experimental observations and the present theories of the mechanism of fatigue.
Author:
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ISBN:
Category : Power resources
Languages : en
Pages : 1064
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Author:
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ISBN:
Category : Engineering
Languages : en
Pages : 492
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