Chemical composition effect on VVER-1000 RPV weld metal thermal aging

Гурович, Б. А.; Chernobaeva, A. A.; Erak, D.; Кулешова, Е. А.; Zhurko, D. A.; Papina, V. B.; Skundin, M. A.; Maltsev, D.A.

doi:10.1016/j.jnucmat.2015.06.010

Cited by 21 publications

(2 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…13) As for the effect of S, radiation embrittlement was increased with increasing S content in VVER-1000 RPV weld but no effect was observed in the base metal. 14) As for the estimation method of irradiation embrittlement, ¦DBTT, several empirical formulas were established by means of statistic analytical method for the impact test data of irradiated RPV steels. The effects of Cu, Ni, silicon (Si) and P were taken into account in the formulas but not for S and Mn.…”

Section: Introductionmentioning

confidence: 99%

Effects of Nickel, Phosphorous and Sulfur on the Post-Irradiation Annealing Behavior of Irradiation Hardening in Fe–0.2 mass% C–0.3 mass% Cu Model Alloys

et al. 2019

View full text Add to dashboard Cite

Micro-Vickers hardness and positron lifetime were measured after 1 MeV proton irradiation to a fluence of 3 © 10 17 ions/cm 2 at below 80°C and post-irradiation isochronal annealing to 650°C to investigate the effects of nickel (Ni), phosphorous (P) and sulfur (S) on the irradiation hardening of Fe0.2 mass% C0.3 mass% Cu model alloy. With increasing the Ni content to 0.6 mass%, irradiation hardening was increased, while a further increase to 1 mass% resulted in a small reduction. The addition of 0.05 mass% P increased the irradiation hardening of the model alloys irrespective of the addition of 0.6 mass% Ni, while the addition of 0.05 mass% S showed almost no effect on the hardening. Positron lifetime measurements revealed that the intensity of long-lifetime component, namely the number density of microvoids, increased and decreased for the alloy added with P and S, respectively. However, no significant effect of Ni content on the long-lifetime component was observed. Post-irradiation anneal-hardening was large and became a maximum at around 350375°C in most of the alloys studied. The addition of 0.6 mass% Ni caused almost no effect on the annealing behavior, while further addition of 0.05 mass% P reduced the hardness change by the annealing to 400°C. During post-irradiation annealing to around 400°C, the long-lifetime component increased in the alloy with P, but it was so small in the alloy with S or manganese (Mn). These suggest that P enhances the growth of the microvoids but S as well as Mn suppress it.

show abstract

Section: Introductionmentioning

confidence: 99%

Effects of Nickel, Phosphorous and Sulfur on the Post-Irradiation Annealing Behavior of Irradiation Hardening in Fe–0.2 mass% C–0.3 mass% Cu Model Alloys

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Currently, there are various technological approaches to stress relaxation, among which are the following well-known methods: natural aging [3,4], thermal method [5][6][7], static overloading [8,9] and the method of vibroageing [10][11][12]. In particular, in the production of elastic plates on JSC Engels Design Bureau "Signal" (Engels, Russia) the technology of "aging" is applied to relieve residual stresses.…”

Section: Introductionmentioning

confidence: 99%

The Study of the Influence of Ultrasonic Vibrations on Structural Changes of Steel

Королев

Balayev

Vasin

2019

MSF

View full text Add to dashboard Cite

The paper describes a cause of the geometric accuracy degradation of slender metallic products during their operation, which consists in the relaxation of residual stresses accumulated while product manufacturing. The most promising technology among the existing technologies of residual stress relaxation is based on the use of vibromechanical vibrations. This technology has high performance and low energy consumption. The reason for the relaxation of residual stresses under the action of vibromechanical vibrations is the gradual accumulation of internal energy, which leads to plastic dislocation shifts upon reaching a critical level. The dislocation motion under the action of vibromechanical vibrations continues until the dislocations take a more compact layout that corresponds to the equilibrium energy state. For technological implementation of the process there was developed a method of ultrasonic stabilization of elastic plates, which serve as sensing elements in differential-pressure transducers. The experimental studies of ultrasonic stabilization are carried out. According to the results of the studies, there have been conducted tests of the microstructure of the control samples. It is established that the samples of steel 20CH13 subject to ultrasonic treatment have a more uniform structure than the samples after the factory technology of long "aging". This confirms the assumption about the structural-energy processes occurring during vibromechanical relaxation of residual stresses. The technology of ultrasonic stabilization can be recommended as a replacement to the "aging" technology on the basis of the obtained results.

show abstract

Grain Boundary Embrittlement of Steels of Vver-1000 Reactor Vessels Under Long-Term Operation

2019

View full text Add to dashboard Cite

Chemical composition effect on VVER-1000 RPV weld metal thermal aging

Cited by 21 publications

References 4 publications

Effects of Nickel, Phosphorous and Sulfur on the Post-Irradiation Annealing Behavior of Irradiation Hardening in Fe–0.2 mass% C–0.3 mass% Cu Model Alloys

Effects of Nickel, Phosphorous and Sulfur on the Post-Irradiation Annealing Behavior of Irradiation Hardening in Fe–0.2 mass% C–0.3 mass% Cu Model Alloys

The Study of the Influence of Ultrasonic Vibrations on Structural Changes of Steel

Grain Boundary Embrittlement of Steels of Vver-1000 Reactor Vessels Under Long-Term Operation

Contact Info

Product

Resources

About