Stress Corrosion Cracking Behavior of Zirconium in Boiling Nitric Acid Solutions at Oxide Formation Potentials

Ishijima, Yasuhiro; Kato, Chiaki; Motooka, Takafumi; Yamamoto, Masahiro; Kano, Yoichi; Ebina, Tetsunari

doi:10.2320/matertrans.m2012341

Cited by 12 publications

(3 citation statements)

References 8 publications

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“…Nagano et al [21] noted that a passive oxide film in pure zirconium and its alloys ruptured because of stress in corrosive environments depending on temperature and HNO 3 concentration. Several other studies have reported on the stress-based corrosion cracking in zirconium and its alloys [22][23][24][25]. A high residual stress gradient can result in rapid delamination of welded plates within a few seconds after the collision of plates in the case of improper welding parameters.…”

Section: Introductionmentioning

confidence: 99%

Influence of Impact Velocity on the Residual Stress, Tensile Strength, and Structural Properties of an Explosively Welded Composite Plate

et al. 2020

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This study aimed to analyze the effect of the impact velocity of a Zr 700 flyer plate explosively welded to a Ti Gr. 1/P265GH bimetallic composite on the residual stress formation, structural properties, and tensile strength. The residual stresses were determined by the orbital hole-drilling strain-gauge method in a surface layer of Zr 700 in as-received and as-welded conditions. The analysis of the tensile test results based on a force parallel to interfaces was used to propose a model for predicting the yield force of composite plates. Compressive residual stresses found in the initial state of the Zr 700 plate were transformed to tensile stresses on the surface layer of the welded Zr 700 plate. A higher impact velocity resulted in higher tensile stresses in the Zr 700 surface layer. To increase the resistance of the composite plate to stress-based corrosion cracking, a lower value of impact velocity is recommended in the welding process.

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Section: Introductionmentioning

confidence: 99%

Influence of Impact Velocity on the Residual Stress, Tensile Strength, and Structural Properties of an Explosively Welded Composite Plate

et al. 2020

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“…11,12 SCC has been the subject of study in recent years for different materials, because of the enormous damage it causes in structures. [13][14][15][16][17][18][19][20][21][22][23][24][25][26] The susceptibility of DSSs to SCC has recently been studied by Laitinen and Hanninen 27 who investigated SCC susceptibility in a 50 wt-% CaCl 2 solution at 100°C for the UNS S31803 DSS. They observed that crack propagation was mainly through the austenite phase.…”

Section: Introductionmentioning

confidence: 99%

Temperature influence on SCC behaviour of duplex stainless steel

Brandolt

Rosa

Ramos

et al. 2016

Materials Science and Technology

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Some studies have related damages in duplex stainless steel (DSS) structures due to stress corrosion cracking (SCC), however, different mechanisms are observed depending of the electrolyte, temperature, electrochemical potential and steel composition. Wherefore, the SCC mechanisms of the AISI 318 DSS in a 115 000 ppm of chloride solution at 25 and 70°C were investigated. The results showed that the SCC cracks propagated in both phases, ferrite and austenite. A reduction in elongation was observed at anodic potentials caused by electrochemical dissolution and at cathodic potentials below −650 mVECS at 70°C and −750 mVECS at 25°C related to SCC mechanism. Accordingly, the more susceptible and protective potentials were determined for DSS in both temperatures.

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“…A nobler corrosion potential causes a breakdown in the passivated film and increases the SCC susceptibility in nitric acid solutions [7]. Recently, an investigation of the SCC of zirconium in nitric acid solutions CONTACT Chiaki Kato kato.chiaki@jaea.go.jp concluded that the tarnish rupture of a grown thick zirconium oxide film during anodic oxidization is a convincing SCC mechanism [8]. However, the relationship between the orientation of the zirconium plate and the growth properties of the zirconium oxide film related to SCC was not fully studied.…”

Section: Introductionmentioning

confidence: 99%

The effect of crystal textures on the anodic oxidization of zirconium in a boiling nitric acid solution

Kato

Ishijima

Ueno

et al. 2015

Journal of Nuclear Science and Technology

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The effects of crystal textures and the potentials in the anodic oxidation of zirconium in a boiling nitric acid solution were investigated to study the stress corrosion cracking of zirconium in nitric acid solutions. The test specimen was machined such that the specimen surface was parallel to the rolling surface, arranged with a (0002) crystal texture. The potentials applied for the anodic oxidation of zirconium were set at 1.2, 1.4, and 1.5 V against a saturated KCl-Ag/AgCl electrode (SSE) in boiling 6 M HNO 3 . The growth of the zirconium oxide film dramatically changed depending on the applied potential at a closed depassivation potential (1.47 V vs. SSE in this study). At 1.5 V, the zirconium oxide film rapidly grows, and its growth exhibits cyclic oxidation kinetics in accordance with a nearly cubic rate law. The zirconium oxide film grows according to the quantity of electric charge and the growth rate does not depend on the crystal texture in the pretransition region before the cyclic oxidation kinetics. However, the growth and cracking under the thick oxide film depend on the crystal texture in the transition region. On the normal direction side, the oxide film thickness decreases on average since some areas of the thick oxide film are separated from the specimen surface owing to the cracks in the thick oxide. On the rolling direction (RD) side, no cracks in the thick oxide film are observed, but cracks are found under the thick oxide film, which deeply propagate in metal matrix along the RD without an external stress. The cracks under the thick oxide film propagate to the center of the oxide layer. The crystal orientation relationship between the oxide layer and the zirconium matrix is (0002) Zr //(111) ZrO2 , and the cracks in the oxide layer propagate in the (0002) Zr plane in the zirconium matrix. The oxide layer consists of string-like zirconium oxide and zirconium hydride. The string-like zirconium oxide contains orthorhombic ZrO 2 in addition to monoclinic ZrO 2 . It is not well known why the cracks propagate along the (0002) Zr plane under the thick oxide film. As one assumption for the mechanism of crack initiation and propagation without an external stress, it is considered that the oxidizing zirconium hydrides precipitated in the (0002) Zr plane near the interface of the thick oxide film and the matrix. Then, the phase transformation from orthorhombic ZrO 2 to monoclinic ZrO 2 in the oxide layer causes the crack propagation in the (0002) plane.

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Stress Corrosion Cracking Behavior of Zirconium in Boiling Nitric Acid Solutions at Oxide Formation Potentials

Cited by 12 publications

References 8 publications

Influence of Impact Velocity on the Residual Stress, Tensile Strength, and Structural Properties of an Explosively Welded Composite Plate

Influence of Impact Velocity on the Residual Stress, Tensile Strength, and Structural Properties of an Explosively Welded Composite Plate

Temperature influence on SCC behaviour of duplex stainless steel

The effect of crystal textures on the anodic oxidization of zirconium in a boiling nitric acid solution

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