Evaluation of Irradiated Pressure Vessel Steel by Mechanical Tests and Positron Annihilation Lineshape Analysis

2009 ◽  
pp. 559-559-9
Author(s):  
N Nakamura ◽  
Y Ohta ◽  
K Yoshida ◽  
N Maeda
Keyword(s):  
Positron Annihilation ◽  
Pressure Vessel ◽  
Mechanical Tests ◽  
Pressure Vessel Steel ◽  
Vessel Steel ◽  
Lineshape Analysis

Neutron Damage in Reactor Pressure-Vessel Steel Examined with Positron Annihilation Lifetime Spectroscopy

1996 ◽  
Vol 439 ◽  
Author(s):  
Stephen E. Cumblidge ◽  
Arthur T. Motta ◽  
Gary L. Catchen
Keyword(s):  
Positron Annihilation ◽  
Pressure Vessel ◽  
Reactor Pressure Vessel ◽  
Positron Annihilation Lifetime Spectroscopy ◽  
Pressure Vessel Steel ◽  
Vessel Steel ◽  
Positron Annihilation Lifetime ◽  
Neutron Damage ◽  
Positron Lifetimes ◽  
Reactor Pressure

AbstractWe have used positron annihilation lifetime spectroscopy to study the development of damage and annealing behavior of neutron-irradiated reactor pressure-vessel steels. We irradiated samples of ASTM A508 nuclear reactor pressure-vessel steel to fast neutron 172 fluences of up to 1017 n/cm2, and we examined these samples using positron annihilation lifetime spectroscopy (PALS) to study the effects of neutron damage in the steels on positron lifetimes. Non-irradiated samples show two positron lifetimes: a 110 ps component corresponding to annihilations in the bulk material, and a 165 ps lifetime corresponding to annihilations in dislocation defects. The irradiated samples show an additional lifetime component of 300 ps in the PAL spectra and an increase in the proportion of annihilations with a 165 ps lifetime, suggesting that vacancies and vacancy clusters are present in the material after room temperature irradiation. The samples were then annealed to temperatures ranging from 210° C to 450° C. The positron lifetimes introduced by neutron damage disappear after annealing the samples at 280° C.

Examination of Neutron-Irradiated Pressure-Vessel Steel Using Positron Annihilation Lifetime Spectrosopy

1998 ◽  
Vol 540 ◽  
Author(s):  
Stephen E. Cumblidge ◽  
Arthur T. Motta ◽  
Gary L. Catchen
Keyword(s):  
Positron Annihilation ◽  
Pressure Vessel ◽  
Positron Lifetime ◽  
Pressure Vessel Steel ◽  
Vessel Steel ◽  
Positron Annihilation Lifetime ◽  
Annealing Temperatures ◽  
Neutron Damage ◽  
Reactor Temperature ◽  
Positron Lifetimes

AbstractOn a variety of pressure-vessel (PV) steels, we have observed changes in the average positron lifetime with increasing (near end-of-life) neutron fluences. Samples were irradiated at reactor-temperature and subjected to post-irradiation annealing, and they were examined using positron annihilation lifetime spectroscopy (PALS). The measured average positron lifetimes in high-temperature (2900 C-300° C) irradiated PV steels decrease with increasing neutron damage up to fluences of 8.5×1018 cm−2 and increase again at higher fluences. Annealing of high-fluence, 300° C irradiated ASTM A508 PV steel samples produces an initial decrease in average positron lifetimes with increasing annealing temperatures of up to 400° C, followed by an increase in average positron lifetime with higher annealing temperatures, when samples were annealed in successive 24-hour steps. A sample of weld steel, irradiated to 2.2×1019 cm−2 at 290° C, shows similar behavior in which the minimum lifetime occurs at ≈ 450° C. These trends are similar to those seen in previous studies performed on VVER and other ferritic steels.

scholarly journals On the Weldability of Thick P355NL1 Pressure Vessel Steel Plates Using Laser Welding

Materials ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 131
Author(s):  
Jiří Čapek ◽  
Karel Trojan ◽  
Jan Kec ◽  
Ivo Černý ◽  
Nikolaj Ganev ◽  
...  
Keyword(s):  
High Pressure ◽  
Laser Welding ◽  
Pressure Vessel ◽  
Mechanical Tests ◽  
Fatigue Tests ◽  
Steel Plates ◽  
Hazardous Substances ◽  
Pressure Vessel Steel ◽  
Vessel Steel ◽  
Microstructural Parameters

Pipeline transport uses millions of kilometers of pipes worldwide to transport liquid or gas over long distances to the point of consumption. High demands are placed, especially on the transport of hazardous substances under high pressure (gas, oil, etc.). Mostly seamless steel pipes of various diameters are used, but their production is expensive. The use of laser-welded pipes could significantly reduce the cost of building new pipelines. However, sufficient mechanical properties need to be ensured for welded pipes to meet stringent requirements. Therefore, laser-welded 10 mm thick pressure vessel steel plates were subjected to various mechanical tests, including high-cycle fatigue tests. Furthermore, the microstructural parameters and the state of residual stresses were determined using X-ray and neutron diffraction, which could affect fatigue life, too. The critical areas for possible crack initialization, especially in and near the heat-affected zone, were found using different tests. The presented results outline the promising application potential of laser welding for the production of pipes for high-pressure pipelines.

The Effect of Si Content on Microstructures and Mechanical Properties of Normalized Pressure Vessel Steel A517 Grade Q

2021 ◽  
Vol 1160 ◽  
pp. 15-23
Author(s):  
Y. Amalia ◽  
A.A. Maulana ◽  
E. Pujiyulianto
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Wear Resistance ◽  
Pressure Vessel ◽  
Mechanical Tests ◽  
Impact Testing ◽  
Pressure Vessel Steel ◽  
Vessel Steel ◽  
Microstructures And Mechanical Properties ◽  
Si Content

This research aims to investigate the effect Si on microstructures and mechanical properties of normalized pressure vessel steel A517 Grade Q. The Si contents were varied from 0.5, 0.9, 1.2, and 1.6. The normalizing process was carried out at 920 °C in 10 minutes. The microstructures were characterized by optical light microscope and Scanning Electron Microscope (SEM), and The mechanical tests were conducted by hardness, tensile, wear, and impact testing machine. The microstructures and mechanical properties were investigated. The results of the microstructures test show that the phases of the material are bainite and ferrite. The increase of Si content will refine and distribute the bainite phase in the ferrite matrix. The mechanical tests show that the Si content will affect the mechanical properties such as hardness, tensile strength, ductility, wear resistance, and toughness. The Increase of Si content from 0.5 up to 1.2 will increase the hardness, tensile strength, and wear resistance, and will decrease the elongation and toughness of the normalized pressure vessel steel A517 grade Q. The mechanical properties seem constant from 1.2 up to 1.6 of Si.

Positron Annihilation Studies of Neutron-Irradiated CrMoV-Type Pressure Vessel Steel

1992 ◽  
Vol 105-110 ◽  
pp. 901-904 ◽  
Author(s):  
František Bečvář ◽  
Yvonna Jirásková ◽  
E. Keilová ◽  
J. Kocík ◽  
L. Lešták ◽  
...  
Keyword(s):  
Positron Annihilation ◽  
Pressure Vessel ◽  
Pressure Vessel Steel ◽  
Vessel Steel ◽  
Type Pressure
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