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Initiation Of Delayed Hydride Cracking In Zr 25nb
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Book Synopsis Initiation of Delayed Hydride Cracking in Zr-2.5Nb by : Douglas Keith Rodgers
Download or read book Initiation of Delayed Hydride Cracking in Zr-2.5Nb written by Douglas Keith Rodgers and published by . This book was released on 1992 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: Delayed Hydride Cracking (DHC) occurs in Zr-2.5Nb when certain requirements are met. The mechanism of DHC consists of diffusion of hydrogen to a stress concentrator, such as a crack-tip, precipitation then fracture of a hydride at the crack-tip, and repetition of the process; the crack advances in steps. Incubation times, to the start of cracking and crack-tip hydride morphologies have been measured in pre-cracked cantilever beam specimens tested at applied K$\rm\sb I$'s up to 20 MPam$\sp{1/2}$ and temperatures ranging from 100 to 250$\sp\circ$C. The incubation time for DHC was found to vary inversely with DHC velocity. Contrary to previous research, the incubation time is highly variable, even for a given temperature and applied K$\rm\sb I,$ and the crack-tip hydride morphology is much more complicated than the simple model of a single hydride at a crack-tip.
Book Synopsis The Initiation of Delayed Hydride Cracking in Zirconium-2.5 Niobium by :
Download or read book The Initiation of Delayed Hydride Cracking in Zirconium-2.5 Niobium written by and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Initiation of Delayed Hydride Cracking in Zirconium-2.5 Wt.% Niobium Pressure Tubes by : Ahmed Fathi Shalabi
Download or read book Initiation of Delayed Hydride Cracking in Zirconium-2.5 Wt.% Niobium Pressure Tubes written by Ahmed Fathi Shalabi and published by . This book was released on 1989 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Initiation of Delayed Hydride Cracking in Zr-2.5Nb Micro Pressure Tubes by : Ravi Kumar Sundaramoorthy
Download or read book Initiation of Delayed Hydride Cracking in Zr-2.5Nb Micro Pressure Tubes written by Ravi Kumar Sundaramoorthy and published by . This book was released on 2009 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pressure tubes pick up hydrogen while they are in service within CANDU reactors. Sufficiently high hydrogen concentration can lead to hydride precipitation during reactor shutdown/repair at flaws, resulting in the potential for eventual rupture of the pressure tubes by a process called Delayed Hydride Cracking (DHC). The threshold stress intensity factor (KIH) below which the cracks will not grow by delayed hydride cracking of Zr-2.5Nb micro pressure tubes (MPTs) has been determined using a load increasing mode (LIM) method at different temperatures. MPTs have been used to allow easy study of the impact of properties like texture and grain size on DHC. Previous studies on MPTs have focused on creep and effects of stress on hydride orientation; here the use of MPTs for DHC studies is confirmed for the first time. Micro pressure tube samples were hydrided to a target hydrogen content of 100 ppm using an electrolytic method. For DHC testing, 3 mm thick half ring samples were cut out from the tubes using Electrical Discharge Machining (EDM) with a notch at the center. A sharp notch with a root radius of 15 mu m was introduced by broaching to facilitate crack initiation. The direct current potential drop method was used to monitor crack growth during the DHC tests. For the temperature range tested the threshold stress intensity factors for the micro pressure tube used were found to be 6.5-10.5 MPa.m1/2 with the value increasing with increasing temperature. The average DHC velocities obtained for the three different test temperatures 180, 230 and 250oC were 2.64, 10.87 and 8.45 x 10-8 m/s, respectively. The DHC data obtained from the MPTs are comparable to the data published in the literature for full sized CANDU pressure tubes.
Book Synopsis Initiation of Delayed Hydride Cracking in Zirconium-2.5 Niobium by : Douglas Keith Rodgers
Download or read book Initiation of Delayed Hydride Cracking in Zirconium-2.5 Niobium written by Douglas Keith Rodgers and published by . This book was released on 1992 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Delayed Hydride Cracking (DHC) occurs in Zr-2.5Nb when certain requirements are met. The mechanism of DHC consists of diffusion of hydrogen to a stress concentrator, such as a crack-tip, precipitation then fracture of a hydride at the crack-tip, and repetition of the process; the crack advances in steps. Incubation times, to the start of cracking and crack-tip hydride morphologies have been measured in pre-cracked cantilever beam specimens tested at applied K$\rm\sb I$'s up to 20 MPam$\sp{1/2}$ and temperatures ranging from 100 to 250$\sp\circ$C. The incubation time for DHC was found to vary inversely with DHC velocity. Contrary to previous research, the incubation time is highly variable, even for a given temperature and applied K$\rm\sb I,$ and the crack-tip hydride morphology is much more complicated than the simple model of a single hydride at a crack-tip.
Book Synopsis Crack initiation by delayed hydride cracking at sharp notches in zr-2.5 nb alloys by : S. Sagat
Download or read book Crack initiation by delayed hydride cracking at sharp notches in zr-2.5 nb alloys written by S. Sagat and published by . This book was released on 2003 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Delayed Hydride Cracking of Zr-2.5%Nb by : Richard R. Smith
Download or read book Delayed Hydride Cracking of Zr-2.5%Nb written by Richard R. Smith and published by . This book was released on 1987 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of Rates of Delayed Hydride Cracking (DHC) in Zr-2.5Nb Alloys--An IAEA Coordinated Research Project by : Christopher E. Coleman
Download or read book Measurement of Rates of Delayed Hydride Cracking (DHC) in Zr-2.5Nb Alloys--An IAEA Coordinated Research Project written by Christopher E. Coleman and published by . This book was released on 2008 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: Values of DHC rates in Zr alloys are sensitive to measurement procedures. A standard method has been developed at the laboratories of AECL and evaluated in a round-robin involving ten IAEA member states. Two test materials were used--Zr-2.5Nb pressure tubes in the cold-worked (CANDUTM) and heat-treated (RBMK) conditions. Cracks were grown from fatigued starter cracks in the axial direction on the axial-radial plane of the original tubes. To obtain the maximum value of Vc, specimens were heated to dissolve all their hydrogen, then cooled at 1 to 3°C/min to the test temperature before loading at 15 MPa?m. Although the start of cracking was detected by potential drop, the extent of cracking was measured directly on the crack faces. The values of incubation time to the start of cracking were highly variable but Vc was well behaved. The values of Vc were normally distributed with a range varying from a factor of 1.2 to 5.2. At 250°C the mean value of Vc from 80 specimens of cold-worked material was 8.9(±1.12)x10-8 m/s and from 41 specimens of heat-treated material the mean value of Vc was3.3(±0.64)x10-8 m/s. Tests were also done at six other temperatures between 144 and 283°C, using up to 22 specimens at each temperature. Both materials had an Arrhenius-type temperature dependence, Vc=Aexp(-Q/RT). The use of strictly defined and coordinated experimental procedures gave a consistent set of Vc values, allowing effective comparison of results obtained in different national laboratories and resulting in good correlations between the DHC velocity values and differences in strength, crystallographic texture, and distribution of ?-phase in the test materials.
Book Synopsis The effect of texture on delayed hydride cracking in zr-2.5nb alloy by : M. Resta Levi
Download or read book The effect of texture on delayed hydride cracking in zr-2.5nb alloy written by M. Resta Levi and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Arrest of Delayed Hydride Cracking in Zr-2.5%Nb Alloys at Elevated Temperatures by : Gang Lin
Download or read book The Arrest of Delayed Hydride Cracking in Zr-2.5%Nb Alloys at Elevated Temperatures written by Gang Lin and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Prevention of Delayed Hydride Cracking in Zirconium Alloys by : JFR Ambler
Download or read book Prevention of Delayed Hydride Cracking in Zirconium Alloys written by JFR Ambler and published by . This book was released on 1987 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: Zirconium alloys are susceptible to a mechanism for crack initiation and propagation called delayed hydride cracking. From a review of component failures and experimental results, we have developed the requirements for preventing this cracking. The important parameters for cracking are hydrogen concentration, flaws, and stress; each should be minimized. At the design and construction stages hydrogen pickup has to be controlled, quality assurance needs to be at a high enough level to ensure the absence of flaws, and residual stresses must be eliminated by careful fabrication and heat treatment.
Book Synopsis The Arrest of Delayed Hydride Cracking in ZR-2.5%NB Alloys at Elevated Temperatures by : Gang Lin (Ph. D.)
Download or read book The Arrest of Delayed Hydride Cracking in ZR-2.5%NB Alloys at Elevated Temperatures written by Gang Lin (Ph. D.) and published by . This book was released on 1999 with total page 582 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effect of Hydrogen and Hydrides on the Integrity of Zirconium Alloy Components by : Manfred P. Puls
Download or read book The Effect of Hydrogen and Hydrides on the Integrity of Zirconium Alloy Components written by Manfred P. Puls and published by Springer Science & Business Media. This book was released on 2012-08-04 with total page 475 pages. Available in PDF, EPUB and Kindle. Book excerpt: By drawing together the current theoretical and experimental understanding of the phenomena of delayed hydride cracking (DHC) in zirconium alloys, The Effect of Hydrogen and Hydrides on the Integrity of Zirconium Alloy Components: Delayed Hydride Cracking provides a detailed explanation focusing on the properties of hydrogen and hydrides in these alloys. Whilst the emphasis lies on zirconium alloys, the combination of both the empirical and mechanistic approaches creates a solid understanding that can also be applied to other hydride forming metals. This up-to-date reference focuses on documented research surrounding DHC, including current methodologies for design and assessment of the results of periodic in-service inspections of pressure tubes in nuclear reactors. Emphasis is placed on showing how our understanding of DHC is supported by progress in general understanding of such broad fields as the study of hysteresis associated with first order phase transformations, phase relationships in coherent crystalline metallic solids, the physics of point and line defects, diffusion of substitutional and interstitial atoms in crystalline solids, and continuum fracture and solid mechanics. Furthermore, an account of current methodologies is given illustrating how such understanding of hydrogen, hydrides and DHC in zirconium alloys underpins these methodologies for assessments of real life cases in the Canadian nuclear industry. The all-encompassing approach makes The Effect of Hydrogen and Hydrides on the Integrity of Zirconium Alloy Component: Delayed Hydride Cracking an ideal reference source for students, researchers and industry professionals alike.
Book Synopsis Delayed hydride cracking (dhc) velocity (axial) at 250 degrees c for zr-2.5nb cezus pressure tube materials by : R. Choubey
Download or read book Delayed hydride cracking (dhc) velocity (axial) at 250 degrees c for zr-2.5nb cezus pressure tube materials written by R. Choubey and published by . This book was released on 1996 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Advances in the theory of delayed hydride cracking in zirconium alloys by : S-Q. Shi
Download or read book Advances in the theory of delayed hydride cracking in zirconium alloys written by S-Q. Shi and published by . This book was released on 1996 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Delayed hydride cracking behaviour in Zr-2.5 Nb under simulated depressurized condition by : G. K. Shek
Download or read book Delayed hydride cracking behaviour in Zr-2.5 Nb under simulated depressurized condition written by G. K. Shek and published by . This book was released on 1986 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The effect of microstructure on rates of delayed hydride cracking in zr-2.5 percent nb alloy by : L. A. Simpson
Download or read book The effect of microstructure on rates of delayed hydride cracking in zr-2.5 percent nb alloy written by L. A. Simpson and published by . This book was released on 1984 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
