A composite steel plate includes at least two steel sheets rolled to form a plate. One of the sheets has a composition that varies in a depthwise direction, between nanocrystalline and micron grained. The plate is made by treating a steel sheet to produce a composition in the sheet that varies in a
A composite steel plate includes at least two steel sheets rolled to form a plate. One of the sheets has a composition that varies in a depthwise direction, between nanocrystalline and micron grained. The plate is made by treating a steel sheet to produce a composition in the sheet that varies in a depthwise direction of the sheet between nanocrystalline and micron grained, stacking the treated sheet with at least one other steel sheet, and rolling the stacked sheets to form the plate.
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1. A method for producing a composite steel plate comprising: treating a first steel sheet to produce a crystalline grain structure, in the first steel sheet, that varies, in a depthwise direction of the first steel sheet, between nanocrystalline at a first surface of the first steel sheet and micro
1. A method for producing a composite steel plate comprising: treating a first steel sheet to produce a crystalline grain structure, in the first steel sheet, that varies, in a depthwise direction of the first steel sheet, between nanocrystalline at a first surface of the first steel sheet and micron grained in the interior of the first steel sheet,stacking the first steel sheet that has been treated on a second steel sheet that has a coarse grain crystalline structure that is uniform in a depthwise direction of the second steel sheet, with the first surface of the first steel sheet in contact with the second steel sheet, androlling the first and second steel sheets together to form a plate. 2. The method of claim 1, wherein treating the first steel sheet to produce the crystalline grain structure in the first steel sheet that varies in a depthwise direction comprises mechanically inducing nanocrystalline layers in the first surface and a second surface of the first steel sheet, andthe second surface is opposite the first surface, so that the crystalline grain structure varies smoothly from the first and second surfaces of the first steel sheet to micron grained at a center of the first steel sheet. 3. The method of claim 1, wherein treating the first steel sheet to produce the crystalline grain structure in the first steel sheet that varies in a depthwise direction comprises mechanically inducing a nanocrystalline grain structure at the first surface of the first steel sheet so that the crystalline grain structure varies smoothly from the first surface of the first steel sheet to micron grained at a second surface of the first steel sheet, andthe second surface of the first steel sheet is opposite the first surface of the first steel sheet. 4. The method of claim 1 further including, prior to rolling and after stacking, heating the first and second steel sheets to a temperature between room temperature and 0.5 Tm, wherein Tm is the melting point of the first steel sheet. 5. The method of claim 4 including, after stacking, heating the first and second steel sheets to a temperature between 150° C. and 0.4 Tm. 6. The method of claim 1, wherein rolling comprises cold co-rolling. 7. The method of claim 1 further comprising repeating the rolling until the plate has a required thickness. 8. The method of claim 1 including rolling the first and second steel sheets at a temperature between 150° C. to 0.5 Tm, wherein Tm is the melting point of the first steel sheet. 9. The method of claim 1 further comprising annealing the plate. 10. The method of claim 9 including annealing the plate at a temperature between 150° C. to 0.5 Tm, wherein Tm is the melting point of the first steel sheet. 11. The method of claim 1 including treating a third steel sheet to produce a crystalline grain structure, in the third steel sheet, that varies, in a depthwise direction of the third steel sheet, between nanocrystalline at a first surface of the third steel sheet and micron grained in the interior of the third steel sheet,stacking the first, second, and third steel sheets, in that order, with the first surfaces of the first and third steel sheets in contact with respective surfaces of the second steel sheet, androlling the first, second, and third steel sheets, as stacked, to form a plate. 12. The method of claim 11 further including, prior to rolling and after stacking, heating the first, second, and third steel sheets to a temperature between room temperature and 0.5 Tm, wherein Tm is the melting point of the first steel sheet. 13. The method of claim 11, wherein treating the first and third steel sheets to produce the crystalline grain structure in the first and third steel sheets that varies in a depthwise direction comprises mechanically inducing nanocrystalline layers in the first surface and a second surface of each of the first and third steel sheets andthe second surfaces of the first and third steel sheets are opposite the respective first surfaces of the first and third steel sheets, so that the crystalline grain structure varies smoothly from the first and second surfaces of the first and third steel sheets to micron grained at a center of each of the first and third steel sheets. 14. The method of claim 1, wherein rolling comprises warm co-rolling. 15. A method for producing a composite steel plate comprising: treating first and second steel sheets to produce a crystalline grain structure, in the first and second steel sheets, that varies, in a depthwise direction of the first and second steel sheets, between nanocrystalline at a first surface of the first and second steel sheets and micron grained in the interior of the first and second steel sheets,stacking the first and second steel sheets, with the first surfaces of the first and second steel sheets in contact with each other, androlling the first and second steel sheets together to form a plate. 16. The method of claim 15, wherein treating the first and second steel sheets to produce the crystalline grain structure in the first and second steel sheets that varies in a depthwise direction comprises mechanically inducing nanocrystalline layers in the first surface and a second surface of the first and second steel sheets, andthe second surfaces of the first and second steel sheets are opposite the respective first surfaces of the first and second steel sheets, so that the crystalline grain structure varies smoothly from the first and second surfaces of each of the first and second steel sheets to micron grained at a center of each of the first and second steel sheets. 17. The method of claim 15, wherein treating the first and second steel sheets to produce the crystalline grain structure in the first and second steel sheets that varies in a depthwise direction comprises mechanically inducing a nanocrystalline grain structure at the first surfaces of each of the first and second steel sheets so that the crystalline grain structure varies smoothly from the first surfaces of the first and second steel sheets to micron grained at a second surface of each of the first and second steel sheets, andthe respective second surfaces of the first and second steel sheets are opposite the first surfaces of the first and second steel sheets. 18. The method of claim 15 including treating a third steel sheet to produce a crystalline grain structure, in the third steel sheet, that varies, in a depthwise direction of the third steel sheet, between nanocrystalline at a first surface of the third steel sheet and micron grained in the interior of the third steel sheet,stacking the first, second, and third steel sheets, in that order, with the first surfaces of the first and third steel sheets in contact with respective surfaces of the second steel sheet, androlling the first, second, and third steel sheets, as stacked, to form a plate. 19. The method of claim 15 including treating a third steel sheet to produce a crystalline grain structure, in the third steel sheet, that varies, in a depthwise direction of the third steel sheet, between nanocrystalline at a first surface of the third steel sheet and micron grained in the interior of the third steel sheet, wherein treating the first and third steel sheets to produce the crystalline grain structure in the first and third steel sheets that varies in a depthwise direction comprises mechanically inducing a nanocrystalline grain structure at the first surfaces of each of the first and third steel sheets so that the crystalline grain structure varies smoothly from the first surfaces of the first and third steel sheets to micron grained at a second surface of each of the first and third steel sheets, andthe respective second surfaces of the first and second steel sheets are opposite the first surfaces of the first and second steel sheets,stacking the first, second, and third steel sheets, in that order, with the first surfaces of the first and third steel sheets in contact with respective surfaces of the second steel sheet, androlling the first, second, and third steel sheets, as stacked, to form a plate. 20. The method of claim 18, wherein treating the first steel sheet to produce the crystalline grain structure in the first steel sheet that varies in a depthwise direction comprises mechanically inducing nanocrystalline layers in the first surface and a second surface of the first steel sheet, wherein the second surface is opposite the first surface, so that the crystalline grain structure varies smoothly from the first and second surfaces of the first steel sheet to micron grained at a center of the first steel sheet. 21. The method of claim 18, wherein treating the first, second, and third steel sheets to produce the crystalline grain structure in the first, second, and third steel sheets that varies in a depthwise direction comprises mechanically inducing nanocrystalline layers in the first surface and a second surface of each of the first, second, and third steel sheets, andthe second surfaces of the first, second, and third steel sheets are opposite the respective first surfaces of the first, second, and third steel sheets so that the crystalline grain structure varies smoothly from the first and second surfaces of the first, second, and third steel sheets to micron grained at a center of each of the first, second, and third steel sheets.
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이 특허에 인용된 특허 (5)
Yada Hiroshi (Kitakyushu JPX) Matsumura Yoshikazu (Kitakyushu JPX) Nakajima Koe (Kitakyushu JPX), Ferritic steel having ultra-fine grains and a method for producing the same.
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