[PDF] Top 20 A Model for Delayed Hydride Cracking of Zirconium Alloys

... the zirconium matrix hydrostatically compressed by ...the zirconium matrix can have in the thermal cycle will be TSSP-TSSD at any temperatures when the specimen is charged to a hydrogen concentration that ... See full document

... Modelling of DHC is challenging, since the crack growth mechanism involves the interacting phenomena of hydrogen transport, phase transformation, hydrogen-induced deformation and fracture. Yet, fairly simple analytical ... See full document

... Holt-Ibrahim model may be applicable to model the data at ...in zirconium there is impurity segregation which is playing a part in point defect clustering, perhaps by altering the long-range strain ... See full document

... tubes zirconium alloys Zr + ...by zirconium alloy during corrosion process is one of the factors determining lifetime of pressure ...of delayed hydride cracking (DHC) can take ... See full document

... It is proposed [18, 19], that the oxide film growth during quasi-linear stage is determined by transition parameters. Occurrence of the transition in oxidation kinetics of zirconium alloys is due to the ... See full document

... Delayed Hydride Cracking (DHC) has led many ...this model can’t explain the unique phenomenon of a DHC or a constant crack growth rate independent of the applied stress intensity factor or K, ... See full document

... In the present study, the model has been used for the simulation of Zircaloy-2 hydrogen embrittlement and initiation of delayed hydride cracking in a cracked plate[r] ... See full document

... for zirconium alloys in the case of uniaxial tensile ...simple model equating the work done by the dislocations to create the new particle-matrix interface owing to particle shear would give the ... See full document

... in zirconium alloys, ...the hydride precipitation involves plastic deformation due to hydride expansion on precipitation, ...for delayed hydride cracking. DHC experiments ... See full document

... some alloys is termed as the Class-M (or Class-II) ...pill-box model continues to be widely accepted [4]. In this model, the dislocations generated by the Frank-Read sources keep on gliding until the ... See full document

... c racked Zr-2.5wt%Nb pressure tubes has shown that a com­ b ination of high stresses due to improper installation and thermal cycling h a d led to the formation of through w a l l hydrides w h i c h subsequently cracked ... See full document

... decohesion model developed by Oriani. The intensive search of hydride phases was carried ...stress-induced hydride at the grain boundaries (AlH3) for a high purity ...such hydride for specimen ... See full document

... of zirconium alloys. Zirconium is typically alloyed with iron, tin, chromium, and ...in zirconium up to 8% at 982 °C and goes into solution via substitution in the matrix ...to ... See full document

... One of the factors determining remaining lifetime of Zr-2.5% Nb fuel channel (FC) is the amount of hydrogen dissolved during corrosion process. When the concentration of hydrogen exceeds the terminal solid solubility ... See full document

... For hydride forming metals and alloys, an important mechanism for hydrogen related fracture is due to the stress-induced formation and subsequent fracture of hydrides at stress ...these alloys are ... See full document

... The emergence of second neighbor Zr–Zr features in Figs. 8 共 a 兲 and 8 共 b 兲 after the 900 °C anneal is clear evidence of a transition in which there is order on a crystalline scale. The differences between the Fourier ... See full document

... of Zirconium and nickel based materials. Zirconium ceramics with its low thermal conductivity, good adhesion properties with bond coat material which are nickel based alloys acts as a good thermal ... See full document

... on alloys’ surface analysis after immersion into Hanks’ solution, an artificial body fluid simulating inorganic components of the extracellular body fluid, zirconium phosphate precipitation was observed on ... See full document

... (0.05-0.15) %. Carbon in amalgamation with chromium forms carbides which precipitate on grain boundaries. Alloy 600 is stable to intergranular corrosion cracking (ICC) when grain boundaries are completely ... See full document

... Zr-4(Zr-1.5Sn-0.2Fe-0.1Cr, wt%), S5(Zr-0.8Sn-0.34Nb-0.39Fe-0.1Cr), T5(Zr-0.7Sn-1.07Nb-0.32Fe- 0.08Cr) and Zr-1Nb were adopted to prepare Bi-containing zirconium alloys for systematically in- vestigating the ... See full document