Author: R. E. Reed-Hill
Publisher:
ISBN:
Category :
Languages : en
Pages : 35
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).
An Investigation Into the Susceptibility of Tantalum and Vanadium to Slow Strain-Rate Embrittlement Due to Oxygen, Nitrogen and Carbon
Author: R. E. Reed-Hill
Publisher:
ISBN:
Category :
Languages : en
Pages : 35
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).
Publisher:
ISBN:
Category :
Languages : en
Pages : 35
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).
Research in Progress
Author:
Publisher:
ISBN:
Category : Military research
Languages : en
Pages : 834
Book Description
Publisher:
ISBN:
Category : Military research
Languages : en
Pages : 834
Book Description
Scientific and Technical Aerospace Reports
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 744
Book Description
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 744
Book Description
Research in progress
Author: United States. Army Research Office, Research Triangle Park, N.C.
Publisher:
ISBN:
Category :
Languages : en
Pages : 156
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 156
Book Description
Research in Progress Between ... and
Author: United States. Army Research Office
Publisher:
ISBN:
Category : Military research
Languages : en
Pages : 458
Book Description
Publisher:
ISBN:
Category : Military research
Languages : en
Pages : 458
Book Description
Slow Strain-rate Embrittlement in Tantalum Due to Oxygen and Selected Experiments in the Vanadium-oxygen and Tantalum-nitrogen Systems
Author: Ana Estela Diaz
Publisher:
ISBN:
Category : Metals
Languages : en
Pages : 190
Book Description
Publisher:
ISBN:
Category : Metals
Languages : en
Pages : 190
Book Description
Evidence for Slow Strain-Rate Embrittlement in Tantalum Due to Oxygen
Author: A. E. Diaz
Publisher:
ISBN:
Category :
Languages : en
Pages : 6
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 6
Book Description
Government Reports Announcements & Index
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 1052
Book Description
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 1052
Book Description
Corrosion Abstracts
Author:
Publisher:
ISBN:
Category : Corrosion and anti-corrosives
Languages : en
Pages : 596
Book Description
Publisher:
ISBN:
Category : Corrosion and anti-corrosives
Languages : en
Pages : 596
Book Description
Opportunities for a Career in Mining & Metallurgy
Author: Nickolas J. Themelis
Publisher:
ISBN:
Category : Metallurgy
Languages : en
Pages : 180
Book Description
Publisher:
ISBN:
Category : Metallurgy
Languages : en
Pages : 180
Book Description