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WO2017116367A1 - Superalliage empêchant les fuites de rayonnements - Google Patents

Superalliage empêchant les fuites de rayonnements Download PDF

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Publication number
WO2017116367A1
WO2017116367A1 PCT/TR2016/050545 TR2016050545W WO2017116367A1 WO 2017116367 A1 WO2017116367 A1 WO 2017116367A1 TR 2016050545 W TR2016050545 W TR 2016050545W WO 2017116367 A1 WO2017116367 A1 WO 2017116367A1
Authority
WO
WIPO (PCT)
Prior art keywords
superalloy
mev
neutron
radiation leaks
alloy
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/TR2016/050545
Other languages
English (en)
Inventor
Abdulhalik KARABULUT
Bunyamin AYGUN
Turgay KORKUT
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ataturk Universitesi Bilimsel Arastirma Projeleri Birimi
Original Assignee
Ataturk Universitesi Bilimsel Arastirma Projeleri Birimi
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ataturk Universitesi Bilimsel Arastirma Projeleri Birimi filed Critical Ataturk Universitesi Bilimsel Arastirma Projeleri Birimi
Publication of WO2017116367A1 publication Critical patent/WO2017116367A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F1/00—Shielding characterised by the composition of the materials
    • G21F1/02—Selection of uniform shielding materials
    • G21F1/08—Metals; Alloys; Cermets, i.e. sintered mixtures of ceramics and metals
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C19/00—Alloys based on nickel or cobalt
    • C22C19/03—Alloys based on nickel or cobalt based on nickel
    • C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
    • C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
    • C22C19/055—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 20% but less than 30%

Definitions

  • the invention relates to a superalloy used for armoring shielding materials against radiation leaks in nuclear power plants, boron neutron treatment units, laboratory research and investigation studies, storage and transport of radioactive substances and in space vehicles.
  • the invention particularly relates to a superalloy formed of nickel (Ni), chromium (Cr), iron (Fe), rhenium (Re), and tungsten (W) materials and can be used as mooring shielding material against gamma radiation leaks in the range of 1 .25 MeV - 7 MeV energy interval and neutron radiation leaks in the range of 0.45 keV - 4.5 MeV energy interval.
  • 316LN steel (10 % Ni + 66,725 % Fe + 18 % Cr + 2 % men + 2 % Mo + 0.2 % N + 0.03 % C + 1 % say + 0.045 % P) is widely used as armor material.
  • Ni nickel
  • chrome having the high absorption power of the neutron and gamma radiation used in production of this steel leads to inadequate armoring of neutron and gamma radiation.
  • the thickness of the material is increased to eliminate this negativity, cracks occur in the material exposed to high temperatures, which causes leakage.
  • the invention relates to machine components or structural parts made of steel alloy annealed by heat treatment and having a strength of more than 2000 [MPa] for variable mechanical loads, up to a temperature of 160 ⁇ C.
  • the chemical composition of the steel alloy according to the invention should comprise ( % by weight) one or more of 0.48 to 0.55 Carbon (C), 0.18 to 0.25 Silicon (Si), 0.35 to 0.45 Manganese (Mn), 4.40 to 4.70 Chrome (Cr), 2.90 to 3.10 Molybdenum (Mo), and 0.72 to 0.77 Vanadium (V), and even as residue, at most 0.005 phosphorus (P), at most 0.001 sulphur (S), at most 0.1 Nickel (Ni), at most 0.01 Copper (Cu) at most 0.01 Cobalt (Co), at most 0.005 Titanium (Ti), at most 0.01 aluminium (Al), at most 0.003 nitrogen (N), at most 0.002 oxygen (O), at most 0.001 calcium (Ca), at most 0.001 magnesium (Mg), at most 0.005 zinc (Zn), at most 0.005 iron (Fe) and impur
  • the invention is a weldable, high temperature oxidation resistant alloy having cracking sensitivity and strain aging cracking at a low hardening rate.
  • the alloy comprises 25% to 32% weight percent iron, 18% to 25% weight percent chromium, 3.0% to 4.5% weight percent aluminium, 0.2% to 0.6% weight percent titanium, 0.2% to 0.4% weight percent silicon, 0.2% to 0.5% weight percent manganese, and the remaining percentage includes nickel and other foreign substances.
  • the content of Al + Ti should be between 3.4 and 4.2, and the Cr / Al ratio should be between about 4.5 and 8.” .
  • the present invention relates to a superalloy preventing radiation leakage, which meets the above said requirements, eliminates all of the drawbacks, and brings some additional advantages.
  • the primary purpose of the invention is to obtain a superalloy having high neutron and gamma radiation absorption characteristics according to the results of experimental and quasi-experimental Monte Carlo Simulation (GEANT4) by Ni, Cr, Re, and W used in its content.
  • GEANT4 experimental and quasi-experimental Monte Carlo Simulation
  • Use of high rates of nickel and chrome both provides a good corrosion resistance as well as increasing the neutron and gamma radiation absorption power of the material.
  • Use of the refractory elements rhenium and tungsten increases the neutron and gamma radiation absorption power of the material even more. Since these refractory metals move the melting point of the alloy to an advanced level, they provide ease of use and safety at high temperatures.
  • a purpose of the invention is to increase safety precautions by ensuring that the obtained superalloy provides safe armouring in nuclear applications.
  • Another purpose of the invention is to reduce the material thickness with the obtained superalloy. In this way, the problem of cracking at high temperatures is substantially eliminated.
  • Another purpose of the invention relates to a superalloy which is used as armouring shielding material against radiation leaks, and which is easy to produce and can be produced in short time.
  • a superalloy which consists of nickel (Ni), chrome (Cr), iron (Fe), rhenium (Re), and tungsten (W) materials; and can be used as armouring shielding material against gamma radiation leaks in the range of 1 .25 MeV - 7 MeV energy interval and neutron radiation leaks in the range of 0.4 KeV - 4.5 MeV energy interval.
  • the invention is a superalloy obtained from nickel (Ni), chrome (Cr), iron (Fe), rhenium (Re), and tungsten (W) to prevent radiation leaks.
  • Ni nickel
  • Cr chrome
  • Fe iron
  • Re rhenium
  • W tungsten
  • Nickel (Ni) The alloy element nickel forms Ni - Mo or Ni - Cr - Mo alloys, and especially Ni-Cr alloy. It increases the resistance of the alloy against heat and scaling. When used in combination with chrome, it increases the hardness, ductility and high fatigue resistance of the alloy. It has a high gamma and neutron radiation absorption impact section.
  • Chrome (Cr) It is the element that is added the most into steels and alloys. Chrome added to alloy and steel increases the hardness of the alloy or steel. By slowing down the conversion speed, it also increases the depth of hardness. If chrome is used at 25 % ratio, it forms a bright image on the surface of the material, and by forming an oxide layer on the surface, it increases the resistance of the material against corrosion by means of this oxide layer. It also increases the tensile strength and temperature resistance of the alloy. It generally forms better alloys with nickel. It has a high gamma and neutron radiation absorption impact section.
  • Iron Iron is the most commonly used one among all metals, and constitutes 95 % by weight of the metals produced all over the world. Steel is the most well known iron alloy. Steels used in nuclear reactors (316LN) contain about 67 % iron. Iron is not resistant to corrosion due to the oxidation occurring on its surface. In order to protect iron from corrosion, its surface is coated with a non-permeable paint or elements such as nickel and chrome.
  • Rhenium having significantly increased production and applications in recent years, is a refractory metal with a very high melting point and a very good mechanical and electrical properties. It is used in the production of high temperature resistant alloys. It is also used to enhance the properties of tungsten and molybdenum alloys. It also has very high gamma and neutron radiation absorption impact section. Therefore, it is a very good gamma and neutron radiation absorber.
  • Component Preferred amount Usable amount by Name by weight ( %) weight ( %)
  • the usable weight ratios given in Table 2 are mixed until a homogenous state is reached.
  • the mixing operation is carried out for about 1 -2 hours using a mixer.
  • 0.5 % of paraffin is added to the prepared powder mixtures as a lubrication process.
  • the friction between the mass of powder and the tool surfaces of the press machine and the mold walls is reduced, so that the powders can easily slide during compression.
  • a uniform density is formed from the lower surface to the upper surface of the material.
  • the pressed material is easily removed from the mold. Afterwards, the homogeneously mixed powders are pressed under 15-20 tons of pressure, using a pellet press machine. The pressed material is annealed at 1200 to 1 500 ⁇ C (preferably 1 300 ⁇ ) for 4 hours, using an annealing furnace. Following the annealing operation, the superalloy obtained is left to cool down.
  • the obtained super alloy can be produced in many shapes such as plates or pellets in any desired thickness, according to the area of usage.
  • the material is extremely resistant to chemical corrosion.
  • the superalloy can be used at temperatures between 1 380 - 1 600 ⁇ C.
  • the superalloy produced can be used for gamma and neutron radiations with the following energy levels:
  • the super alloy produced is subjected to pressure resistance test under pressures of 25 tons in a 30-ton hydraulic press machine. Moreover, sulphuric acid abrasion tests are also carried out in a sulphuric acid (H2SO4) pool for 24-48 hours. The obtained final superalloy is subjected to 4.5 MeV fast neutron radiation absorption experiments by Am241 - Be fast neutron source and neutron detector. This experiment is also performed for the 31 6LN steel used in the prior art, and the following comparative results are obtained:
  • the linear absorption impact section was found to be 0.235577 cm -1 and the mass absorption impact section was found to be 2.9472 mm 2 /g.
  • the linear absorption impact section is 0.291 96 cm -1 and the mass absorption impact section is 3.1 146 mm 2 / g.
  • the superalloy according to the application seems to have better armouring ability for a gamma radiation of 1 .25 MeV and 7 MeV energy level.
  • the big linear absorption coefficient in gamma armouring is an indication that the material acts as a good armour.
  • ⁇ For 4.5 MeV fast neutrons, the total macroscopic impact section of the 31 6LN steel is 0.309224 cm 1 .
  • the total macroscopic impact section of the superalloy according to the present application for the neutrons of the same energy level is 0.371489 cm 1 .
  • the superalloy according to the present application reduced the dose against 31 6LN steel by about half. Accordingly, the superalloy has exhibited an excellent absorption performance against neutron radiation in this energy level.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Ceramic Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Abstract

L'invention concerne un superalliage utilisé dans les centrales nucléaires, dans les unités de traitement de neutrons de bore, dans la recherche en laboratoire et dans les études d'investigation, dans le stockage et le transport de substances radioactives et dans les matériaux de protection et de blindage contre les fuites de rayonnements dans les véhicules spatiaux ; qui se compose de matériaux en nickel (Ni), chrome (Cr), fer (Fe), rhénium (Re) et tungstène (W) ; et qui peut être utilisé comme matériau de protection et de blindage contre les fuites de rayonnements gamma dans la plage des intervalles d'énergie de 1,25 MeV à 7 MeV et contre les fuites de rayonnements neutroniques dans la plage des intervalles d'énergie de 0,4 keV à 4,5 MeV.
PCT/TR2016/050545 2015-12-31 2016-12-28 Superalliage empêchant les fuites de rayonnements Ceased WO2017116367A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR2015/17729 2015-12-31
TR201517729 2015-12-31

Publications (1)

Publication Number Publication Date
WO2017116367A1 true WO2017116367A1 (fr) 2017-07-06

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Family Applications (1)

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PCT/TR2016/050545 Ceased WO2017116367A1 (fr) 2015-12-31 2016-12-28 Superalliage empêchant les fuites de rayonnements

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WO (1) WO2017116367A1 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2196553B1 (fr) 2008-12-05 2014-10-08 Böhler Edelstahl GmbH & Co KG Alliage d'acier pour composants de machines

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2196553B1 (fr) 2008-12-05 2014-10-08 Böhler Edelstahl GmbH & Co KG Alliage d'acier pour composants de machines

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
KORKUT TURGAY ET AL: "Study of neutron attenuation properties of super alloys with added rhenium", JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY, AKADEMIAI KIADO RT, HU, vol. 306, no. 1, 17 March 2015 (2015-03-17), pages 119 - 122, XP035542140, ISSN: 0236-5731, [retrieved on 20150317], DOI: 10.1007/S10967-015-4063-Z *

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