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Retention Of Mechanical Properties In Steel Alloys After Processing And In The Presence Of Stress Concentration Sites

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اقرأ أكثر حفظ في قائمتي
  • Publication Date:
    January 3, 2019
  • معلومة اضافية
    • Document Number:
      20190003003
    • Appl. No:
      16/021251
    • Application Filed:
      June 28, 2018
    • نبذة مختصرة :
      This invention is related to retention of mechanical properties in high strength steel at reduced thicknesses and which mechanical property performance is also retained at relatively high strain rates. These new steels can offer advantages for a myriad of applications where reduced sheet thickness is desirable. In addition, the alloys herein are those that retain useful mechanical properties after introduction of a geometric discontinuity and an accompanying stress concentration.
    • Assignees:
      The NanoSteel Company, Inc. (Providence, RI, US)
    • Claim:
      1. A method to retain mechanical properties in a metallic sheet alloy at reduced thickness comprising: a. supplying a metal alloy comprising at least 70 atomic % iron and at least four or more elements selected from Si, Mn, Cr, Ni, Cu, or C, melting said alloy, cooling at a rate of <250 K/s, and solidifying to a thickness of 25.0 mm up to 500 mm; b. processing said alloy into sheet form with thickness T1 with the sheet having a total elongation of X1 (%), an ultimate tensile strength of Y1 (MPa), and a yield strength of Z1 (MPa); c. further processing said alloy into a second sheet with reduction in thickness T2
    • Claim:
      2. The method of claim 1 wherein said at least 70 atomic percent iron is combined with five or more elements that are selected from Si, Mn, Cr, Ni, Cu, or C.
    • Claim:
      3. The method of claim 1 wherein said at least 70 atomic percent iron is combined with all six elements: Si, Mn, Cr, Ni, Cu, and C.
    • Claim:
      4. The method of claim 1 wherein the levels of the four elements that are selected are as follows: Si (1.14 to 6.13 atomic percent), Mn (3.19 to 15.17 atomic percent), Cr (0.78 to 8.64 atomic percent); Ni (0.9 to 11.44 atomic percent), Cu (0.37 to 1.87 atomic percent).
    • Claim:
      5. The method of claim 1 wherein said alloy formed in step (b), exhibits X1 (12% to 80%), Y1 (700 MPa to 2100 MPa), and Z1 (250 MPa to 1500 MPa).
    • Claim:
      6. The method of claim 1 wherein said alloy formed in step (b), exhibits a thickness from 1.2 mm to 10.0 mm.
    • Claim:
      7. The method of claim 1 wherein said alloy formed in step (c), exhibits X2 (2 to 90%), Y2 (650 MPa to 2150 MPa), and Z2 (150 MPa to 1600 MPa).
    • Claim:
      8. The method of claim 1 wherein said alloy formed in step (c), exhibits a thickness from 0.2 mm to <1.2 mm.
    • Claim:
      9. The method of claim 1 wherein said alloy formed in step (c) is positioned in a vehicular frame, vehicular chassis, or vehicular panel.
    • Claim:
      10. The method of claim 1 wherein said alloy formed in step (c) is positioned in a storage tank, freight car, or railway tank car.
    • Claim:
      11. A method to retain mechanical properties in a metallic sheet alloy at relatively high strain rates comprising: a. supplying a metal alloy comprising at least 70 atomic % iron and at least four or more elements selected from Si, Mn, Cr, Ni, Cu, or C and melting said alloy and cooling at a rate of <250 K/s and solidifying to a thickness of 25.0 mm up to 500 mm; b. processing said alloy into sheet form with thickness from 1.2 mm to 10.0 mm with the sheet having a total elongation of X1 (%), an ultimate tensile strength of Y1 (MPa), and a yield strength of Z1 (MPa) when tested at a strain rate S1; c. deforming the sheet from said alloy at a strain rate S2>S1 with the sheet having a total elongation of X3=X1±7%, ultimate tensile strength Y3=Y1±200 MPa, and yield strength Z3=Z1±50 MPa.
    • Claim:
      12. The method of claim 11 wherein said at least 70 atomic percent iron is combined with five or more elements that are selected from Si, Mn, Cr, Ni, Cu, or C.
    • Claim:
      13. The method of claim 11 wherein said at least 70 atomic percent iron is combined with all six elements: Si, Mn, Cr, Ni, Cu, and C.
    • Claim:
      14. The method of claim 11 wherein the levels of the four elements that are selected are as follows: Si (1.14 to 6.13 atomic percent), Mn (3.19 to 15.17 atomic percent), Cr (0.78 to 8.64 atomic percent); Ni (0.9 to 11.44 atomic percent), Cu (0.37 to 1.87 atomic percent).
    • Claim:
      15. The method of claim 11 wherein said alloy formed in step (b), exhibits X1 (12% to 80%), Y1 (700 MPa to 2100 MPa), and Z1 (250 MPa to 1500 MPa).
    • Claim:
      16. The method of claim 11 wherein the strain rate S1 is 0.007 s−1 to 0.0001 s−1.
    • Claim:
      17. The method of claim 11 wherein said alloy formed in step (c), exhibits X3 (5% to 87%), Y3 (500 MPa to 2300 MPa), and Z3 (200 MPa to 1550 MPa).
    • Claim:
      18. The method of claim 11 wherein the strain rate S2 is >0.007 s−1 to 1200 s−1.
    • Claim:
      19. The method of claim 11 wherein said processing in step (c) comprises roll forming, metal stamping or hydroforming.
    • Claim:
      20. The method of claim 11 wherein said alloy formed in step (c) is positioned in a vehicular frame, vehicular chassis, or vehicular panel.
    • Claim:
      21. The method of claim 11 wherein said alloy formed in step (c) is positioned in a storage tank, freight car, or railway tank car.
    • Claim:
      22. The method of claim 11 wherein said alloy formed in step (c) is positioned in body armor, shield, military vehicle, or armored vehicle.
    • Claim:
      23. A method to retain mechanical properties in a metallic sheet alloy comprising: a. supplying a metal alloy comprising at least 70 atomic % iron and at least four or more elements selected from Si, Mn, Cr, Ni, Cu, or C and melting said alloy and cooling at a rate of <250 K/s and solidifying to a thickness of 25.0 mm up to 500 mm; b. processing said alloy into sheet form with thickness from 1.2 mm to 10.0 mm with the sheet having a total elongation of X1 (%), an ultimate tensile strength of Y1 (MPa), and a yield strength of Z1 (MPa); c. introducing stress concentration sites and then deforming the sheet from said alloy with the sheet having a total elongation of X4≥0.2X1 (%), an ultimate tensile strength Y4≥0.5Y1 (MPa), and a yield strength Z4≥0.6Z1 (MPa).
    • Claim:
      24. The method of claim 23 wherein said at least 70 atomic percent iron is combined with five or more elements that are selected from Si, Mn, Cr, Ni, Cu, or C.
    • Claim:
      25. The method of claim 23 wherein said at least 70 atomic percent iron is combined with all six elements: Si, Mn, Cr, Ni, Cu, and C.
    • Claim:
      26. The method of claim 23 wherein the levels of the four elements that are selected are as follows: Si (1.14 to 6.13 atomic percent), Mn (3.19 to 15.17 atomic percent), Cr (0.78 to 8.64 atomic percent); Ni (0.9 to 11.44 atomic percent), Cu (0.37 to 1.87 atomic percent).
    • Claim:
      27. The method of claim 23 wherein said alloy formed in step (b), exhibits X1 (12% to 80%), Y1 (700 MPa to 2100 MPa), and Z1 (250 MPa to 1500 MPa).
    • Claim:
      28. The method of claim 23 wherein said processing in step (c) comprises roll forming, metal stamping or hydroforming.
    • Claim:
      29. The method of claim 23 wherein said alloy formed in step (c) is positioned in a vehicular frame, vehicular chassis, or vehicular panel.
    • Claim:
      30. The method of claim 23 wherein said alloy formed in step (c) is positioned in a storage tank, freight car, or railway tank car.
    • Claim:
      31. The method of claim 23 wherein said alloy formed in step (c) is positioned in body armor, shield, military vehicle, or armored vehicle.
    • Current International Class:
      21; 22; 22; 22; 21; 21; 21; 21
    • الرقم المعرف:
      edspap.20190003003