Author: C. E. ColemanPublisher: Chalk River, Ont. : Metallurgical Engineering Branch, Chalk River Nuclear Laboratories
ISBN:
Category :
Languages : en
Pages : 25
Book Description
Susceptibility of Cold-worked Zirconium-2.5 WT% Niobium Alloy to Delayed Hydrogen Cracking
Author: C. E. ColemanPublisher: Chalk River, Ont. : Metallurgical Engineering Branch, Chalk River Nuclear Laboratories
ISBN:
Category :
Languages : en
Pages : 25
Book Description
Susceptibility of cold-worked zirconium-2.5 wt per cent niobium alloy to delayed hydrogen cracking
Author: C. E. ColemanSusceptibility of Cold-worked Zirconium-2.5 WT% Nobium Alloy to Delayed Hydrogen Cracking
Author: Atomic Energy of Canada LimitedPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Susceptibility of Zirconium Alloys to Delayed Hydrogen Cracking
Author: JFR AmblerPublisher:
ISBN:
Category : Crack initiation
Languages : en
Pages : 19
Book Description
Smooth and notched cantilever beams and round-notched bars were machined from pressure tubes of cold-worked Zr-2.5Nb and Zircaloy-2. They were loaded in the temperature range 290 to 520 K. After two thermal cycles and at high stress, cracks were initiated in smooth beams of cold-worked Zr-2.5Nb. Under the same test conditions, cold-worked Zircaloy-2 plastically deformed with no cracking. When notches were present, cracks propagated at the same rate in both materials by delayed hydrogen cracking. In cold-worked Zr-2.5Nb, the crack velocity followed an Arrhenius plot with an apparent activation energy of 42 kJ/mol. Below 420 K, the threshold stress intensity factor for delayed hydrogen cracking was about 5 MPa m. Therefore, cracking can be prevented by keeping tensile stresses very low.
Zirconium in the Nuclear Industry
Author: George P. SabolPublisher: ASTM International
ISBN: 0803124996
Category : Microstructure
Languages : en
Pages : 953
Book Description
ERDA Energy Research Abstracts
Author: United States. Energy Research and Development AdministrationPublisher:
ISBN:
Category : Medicine
Languages : en
Pages : 988
Book Description
ERDA Energy Research Abstracts
Author: United States. Energy Research and Development Administration. Technical Information CenterPublisher:
ISBN:
Category : Force and energy
Languages : en
Pages : 1118
Book Description
Scientific and Technical Aerospace Reports
Author: Susceptibility of zirconium alloys to delayed hydrogen cracking
Author: C. E. ColemanDelayed Failure Hydrogen Embrittlement of Zirconium. Summary Report, September 15, 1961 to September 14, 1962
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The extent to which zirconium and zirconium alloys exhibit delayed failure (static fatigue) as caused by a combination of absorbed hydrogen and applied stress was investigated. Susceptibility to time-dependent fracture was evaluated for unalloyed zirconium and Zircaloy-2 with 200 and 500 ppm hydrogen as well as for an experimental Zr Al-Sn-Mo alloy and the Canadian Zr-2.5Nb cladding material. For unalloyed zirconium and Zircaloy-2 containing up to 500 ppm hydrogen, no room-temperature, timedependent fracture occurred which could be definitely attributed to the delayed failure phenomenon; an increased grain size, 20% cold deformation by rolling, or corrosion in 750 deg F steam did not significantly affect this behavior. The curve of applied stress versus time to failure at room temperature for the high-strength Zr-Al-Sn--Mo alloy containing 500 ppm hydrcgen established a strong susceptibility to delayed failure due to hydrogen absorption; studies on vacuum-annealed material showed no failures. Further, reduced temperature indicated that the occurrence of static fatigue is temperature dependent. Data for heattreated Zr 2.5Nb containing 500 ppm hydrogen indicated that this material is moderately sensitive to delayed failure at room temperature; higher hydrogen contents caused a greatly increased susceptibility to time-dependent fracture. (auth).