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Delayed Hydride Cracking Dhc Velocity Axial At 250 Degrees C For Zr 25nb Cezus Pressure Tube Materials
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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 Delayed hydride cracking (dhc) velocity (axial) at 250 degrees celsius for zr-2.5nb chepetski pressure tube materials by : R. Choubey
Download or read book Delayed hydride cracking (dhc) velocity (axial) at 250 degrees celsius for zr-2.5nb chepetski 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 Threshold stress intensity factor for delayed hydride cracking at 250 degrees c in zr-2.5nb pressure tube material supplied by cezus by : A. K. Jarvine
Download or read book Threshold stress intensity factor for delayed hydride cracking at 250 degrees c in zr-2.5nb pressure tube material supplied by cezus written by A. K. Jarvine and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Delayed Hydride Cracking in Zirconium Alloys in Pressure Tube Nuclear Reactors by : International Atomic Energy Agency
Download or read book Delayed Hydride Cracking in Zirconium Alloys in Pressure Tube Nuclear Reactors written by International Atomic Energy Agency and published by IAEA. This book was released on 2004 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dated October 2004. With CD-ROM containing additional information inside back cover
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 Threshold stress intensity factor for delayed hydride cracking at 250 degrees c in zr-2.5nb pressure tube material supplied by the chepetski mechanical plant by : A. K. Jarvine
Download or read book Threshold stress intensity factor for delayed hydride cracking at 250 degrees c in zr-2.5nb pressure tube material supplied by the chepetski mechanical plant written by A. K. Jarvine and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Delayed Hydride Cracking in Zirconium Alloys in Pressure Tube Nuclear Reactors. IAEA TECDOC Series by : International Atomic Energy Agency
Download or read book Delayed Hydride Cracking in Zirconium Alloys in Pressure Tube Nuclear Reactors. IAEA TECDOC Series written by International Atomic Energy Agency and published by . This book was released on 2004 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes all of the research work undertaken as part of the IAEA coordinated research program on hydrogen and hydride induced degradation of the mechanical and physical properties of zirconium based alloys, and includes a review of the state of the art in understanding crack propagation by Delayed Hydride Cracking (DHC), and details of the experimental procedures that have produced the most consistent set of DHC rates reported in an international round-robin exercise to this date.
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 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 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 Delayed Hydride Cracking Velocity and Crak Growth Measurement Using DCPD Technique in Zr-2.5Nb Pressure Tube Material by : R. N. Singh
Download or read book Delayed Hydride Cracking Velocity and Crak Growth Measurement Using DCPD Technique in Zr-2.5Nb Pressure Tube Material written by R. N. Singh and published by . This book was released on 2000 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Delayed Hydride Cracking Velocity and Crack Growth Measurement Using DCPD Technique in Zr-2.5Nb Pressure Tube Material by :
Download or read book Delayed Hydride Cracking Velocity and Crack Growth Measurement Using DCPD Technique in Zr-2.5Nb Pressure Tube Material written by and published by . This book was released on 2000 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 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 Factors Controlling Hydrogen Assisted Subcritical Crack Growth in Zr-2.5Nb Alloys by : LA. Simpson
Download or read book Factors Controlling Hydrogen Assisted Subcritical Crack Growth in Zr-2.5Nb Alloys written by LA. Simpson and published by . This book was released on 1977 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: The delayed failure of cold-worked Zr-2.5Nb pressure tube. material has been studied using static load tests on compact-tension specimens containing hydrogen within the range ~ 10 to 400 ?g/g. The experimental approach was to measure crack velocity (V) as a function of crack tip stress intensity factor (K), temperature and hydrogen content, relate these data to fractographic and metallographic observations, and compare the results with recent models of hydrogen embrittlement. Slow crack growth was observed at all temperatures between 25 and 325 °C and at K values between ~ 10 and 50 MPam. Below 250°C, the V-K relationships exhibited two-stage behavior; at K > 15 to 20 MPam, the crack velocity was only weekly dependent on stress intensity, whereas at smaller K values, the crack velocity decreased rapidly with K, an indication of a threshold value of K ~ 5 to 10 MPam. The crack velocity increased with increase in temperature, although because of scatter in the data, this could not be expressed quantitatively. At 250°C and above, slow crack growth was not reproducible except after a thermal cycle. The thermal cycle produced a region of reoriented hydrides concentrated at the crack tip which significantly reduced the incubation period for crack growth and confirmed the important role of the hydride phase in the fracture process. Fractography showed that the features of the slow growth fracture were similar at all temperatures studied. The main observations were of ductile striations, or stretch zones, parallel to the crack front, with brittle, plate-like regions, some of which contained cleavage features, between the striations. A fracture mechanism is suggested which involves the repeated precipitation of hydride at the crack tip, followed by crack advance through this embrittled region, and crack arrest in the more ductile matrix, leading to discontinuous crack growth. This general mode of crack growth has been considered in a recent model for embrittlement in hydride-forming materials, the predictions of which show good agreement with the results from this study.
Book Synopsis Effects of thermal history on delayed hydride crack velocity in zr-2.5 nb pressure tubes at 130 degrees c - interim report by : G. K. Shek
Download or read book Effects of thermal history on delayed hydride crack velocity in zr-2.5 nb pressure tubes at 130 degrees c - interim report written by G. K. Shek and published by . This book was released on 1993 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :M. Resta Levi Publisher :Chalk River, Ont. : Materials and Mechanics Branch, Chalk River Laboratories ISBN 13 : Total Pages : pages Book Rating :4.:/5 (576 download)
Book Synopsis The Effect of Texture on Delayed Hydride Cracking in Zr-2.5Nb Alloy [electronic Resource] by : M. Resta Levi
Download or read book The Effect of Texture on Delayed Hydride Cracking in Zr-2.5Nb Alloy [electronic Resource] written by M. Resta Levi and published by Chalk River, Ont. : Materials and Mechanics Branch, Chalk River Laboratories. This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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