Classifications

• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
• • 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

Definitions

• the present invention relates to an iron-nickel alloy.
• Iron-nickel alloys the chemical composition of which comprises, by weight, from 27% to 60% of nickel, from 0% to 7% of cobalt, the rest being iron and impurities resulting from the production, are used in the form cold-rolled and annealed strips, in particular for manufacturing soft magnetic cores.
• Annealing carried out on very cold-worked cold-rolled strips, has the advantage of giving these alloys a cubic recrystallization texture whose magnetic properties are very favorable for certain applications such as wound cores for magnetic amplifiers.
• the iron-nickel alloy strips with a cubic texture have a very rectangular hysteresis cycle (Br / Bs> 95%).
• the annealing temperature range favorable to obtaining a good texture and satisfactory magnetic properties is too narrow, less than 25 ° C., for manufacturing to be reliable, in particular because the position of this temperature range depends poorly known parameters.
• the object of the present invention is to remedy this drawback by proposing an iron-nickel alloy which is easier to manufacture than the alloy according to the prior art.
• the subject of the invention is an iron-nickel alloy, the chemical composition of which comprises, by weight: 30% ⁇ Ni + Co ⁇ 85% 0% ⁇ Co + Cu + Mn ⁇ 10% 0% ⁇ Mo + W + Cr ⁇ 4% 0% ⁇ V + If ⁇ 2% 0% ⁇ Nb + Ta ⁇ 1% 0.003% ⁇ C ⁇ 0.05% 0.003% ⁇ Ti ⁇ 0.15% 0.003% ⁇ Ti + Zr + Hf ⁇ 0.15% 0.001% ⁇ S + Se + Te ⁇ 0.015% the remainder being iron and impurities resulting from the preparation, the chemical composition satisfying, moreover, the relation: 0% ⁇ Nb + Ta + Ti + Al ⁇ 1%
• the chemical composition is such that: 0.005% ⁇ Ti ⁇ 0.05% 0.001% ⁇ Hf + Zr ⁇ 0.025%
• the manganese content must be greater than 0.05% and it need not be greater than 1%. Likewise, it is preferable that Nb + Ta ⁇ 0.05%.
• the contents of impurities are such that: Mg ⁇ 0.001% Ca ⁇ 0.0025% Al ⁇ 0.05% O ⁇ 0.0025% N ⁇ 0.005% P ⁇ 0.01% Sc + Y + La + Ce + Pr + Nd + Sm ⁇ 0.01%
• the invention also relates to a cold-rolled strip of iron-nickel alloy according to the invention whose recrystallization texture is cubic of the type (100) ⁇ 001>, and its use for the manufacture of a shadow mask for tube. cathode visualization or toric magnetic core.
• the inventors have found, unexpectedly, that by adding to an iron-nickel alloy otherwise in accordance with the prior art, a small amount of titanium, accompanied, possibly, small amounts of Zr or Hf, in the presence of small amounts of S, Se or Te, and possibly of Nb, Ta, C or Mn, the annealing temperature range of the alloy was very significantly enlarged, making it possible to obtain a cubic texture (100) ⁇ 001> very favorable for obtaining good magnetic properties. With these additions, the width of the satisfactory temperature range exceeds 50 ° C., while this width is usually less than 25 ° C.
• the iron-nickel alloys concerned capable of exhibiting a cubic structure mainly contain iron and nickel, the nickel possibly being partially substituted by cobalt. They can also contain, in particular, copper, manganese, molybdenum, tungsten, vanadium, chromium and silicon.
• the rest of the composition consists of iron, the elements specific to the invention, and impurities.
• the impurities are, in particular, magnesium, calcium, aluminum, oxygen, nitrogen, phosphorus and rare earths.
• the contents of these elements are such that: Mg ⁇ 0.001% Ca ⁇ 0.0025% Al ⁇ 0.05% 0 ⁇ 0.0025% N ⁇ 0.005% P ⁇ 0.01% Sc + Y + La + Ce + Pr + Nd + Sm ⁇ 0.01%
• This alloy can be produced in an arc furnace, continuously cast in the form of a slab or thin strip, or in an ingot, then hot rolled in the form of a hot strip.
• the hot strip is then cold rolled with a work hardening rate greater than 80%, and preferably greater than or equal to 90%, to obtain a cold rolled strip.
• the annealing When the cold-rolled strip is intended for the production of toric magnetic cores, the annealing must give the alloy not only a cubic texture, but also a weakest coercive field possible. In this case, it is preferable, first, to cut and wind the strip to form a toric core. The O-ring is then annealed at a temperature between 850 ° C and 1200 ° C to cause primary recrystallization which generates the formation of a cubic texture (100) ⁇ 001>.
• the annealing temperature must be adjusted to, on the one hand, remain below the critical secondary recrystallization temperature with giant grains, and, on the other hand, so that the quantities Bm, Bm-Br, H1 and ⁇ H measured by the CCFR method according to ASTM A598-92 in the chapter "Standard Method For Magnetic Properties of Magnetic Amplifier Cores" are such that: Bm> 14500 Gauss Bm-Br ⁇ 400 Gauss H1 between 0.15 and 0.30 Oersteds ⁇ H ⁇ 0.035 Oersteds.
• the heat treatment can also be carried out directly on the cold-rolled strip, with possibly less constraints on the search for magnetic properties. This is, in particular, the case when the nickel content is close to 36% and the strip is used for the manufacture of shadow masks for cathode-ray viewing tubes; the cubic texture is, in fact, particularly favorable for a good quality of the drilling of holes by chemical etching.
• Annealing is then carried out at a temperature above 550 ° C. and below the secondary recrystallization temperature. When it is not essential to have a particularly low coercive field, the annealing temperature is generally less than 800 ° C.
• Critical temperatures were determined using a thermal gradient oven.
• the chemical compositions of the alloys were, by weight%: Fe Or Mn Yes VS S Al Ti Hf AT ball 36.1 0.4 0.09 0.005 7 ppm ⁇ 0.005 0 0 B ball 36.4 0.3 0.1 0.012 30ppm 0.01 0.019 0.007
• the critical temperatures were: 83% 90% 95% AT 970 ° C 1020 ° C 1040 ° C B 1060 ° C 1090 ° C 1090 ° C
• the alloys 1, 2 and 3 were manufactured according to the prior art and the alloys 4, 5 and 6 according to the invention. These alloys were cold rolled in the form of strips of 0.05 mm thick with work hardening rates of 95%, then the annealing temperature range was determined making it possible to obtain a cubic structure (100) ⁇ 001> as well as the magnetic properties mentioned above.
• the chemical compositions were, in% by weight: alloy Fe * Or Mn Yes VS S Al Ti Zr Hf Nb 1 Ball 47.5 0.38 0.1 0.007 0.005 ⁇ 0.005 - - - - 2 Ball 47.8 0.51 0.21 0.005 0.005 ⁇ 0.005 - - - - 3 Ball 48 0.49 0.23 0.001 0.004 ⁇ 0.005 - - - - 4 Ball 47.5 0.48 0.22 0.009 0.005 ⁇ 0.005 0.021 0.003 - - 5 Ball 47.4 0.49 0.24 0.008 0.004 0.011 0.023 - - 0.02 6 Ball 47.5 0.26 0.01 0.0011 0.005 0.015 0.023 - 0.002 0.026 * Fe and impurities
• the magnetic properties and the satisfactory annealing temperature range were: alloy Bm (gauss) Bm-Br (gauss) H1 (Oersteds) ⁇ H (Oersteds) ⁇ satisfactory annealing ° C 1 14800 140 0.34 0.042 - 2 14500 170 0.36 0.021 - 3 14600 240 0.27 0.032 975/1000 4 14500 190 0.28 0.029 1040/1100 5 14700 130 0.28 0.024 950/1050 6 15000 140 0.26 0.031 1000/1100
• alloys 1 and 2 according to the prior art it is not possible to obtain all of the magnetic characteristics required, namely: Bm> 14500 Gauss, Bm-Br ⁇ 400 Gauss, H1 between 0.15 and 0.30 Oersteds, ⁇ H ⁇ 0.035 Oersteds.
• the satisfactory annealing temperature range has a range of 25 ° C
• the satisfactory annealing temperature range has a range of 60 ° C, 100 ° C and 100 ° C respectively.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Manufacturing Of Steel Electrode Plates (AREA)
• Soft Magnetic Materials (AREA)
• Continuous Casting (AREA)
• Heat Treatment Of Sheet Steel (AREA)
• Electrodes For Cathode-Ray Tubes (AREA)
• Laminated Bodies (AREA)

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• 1996
  • 1996-02-27 FR FR9602404A patent/FR2745298B1/fr not_active Expired - Fee Related
• 1997
  • 1997-01-29 DE DE69706083T patent/DE69706083T2/de not_active Expired - Fee Related
  • 1997-01-29 AT AT97400203T patent/ATE204342T1/de not_active IP Right Cessation
  • 1997-01-29 EP EP97400203A patent/EP0792943B1/de not_active Expired - Lifetime
  • 1997-01-29 ES ES97400203T patent/ES2162204T3/es not_active Expired - Lifetime
  • 1997-02-27 US US08/807,771 patent/US5783145A/en not_active Expired - Fee Related

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