18-07-2019 дата публикации
Номер: US20190217363A1
Автор:
ANDERSON Scott T.,
BRANAGAN Daniel James,
Cheng Sheng,
CISCHKE Jonathan M.,
CLARK Kurtis,
FRERICHS Andrew E.,
GIDDENS Taylor L.,
JUSTICE Grant G.,
Larish Scott,
MACHROWICZ Tad V.,
MEACHAM Brian E.,
PARSONS Craig S.,
SERGUEEVA Alla V.,
TEW Logan J.
Принадлежит:
This invention is related to a method to increase the strength of a metal stamping by supplying a metal blank which has the ability to strengthen in-situ during stamping to achieve sets of properties not expected and much higher based on the starting properties of the blank. 1. A method to develop yield strength distributions in a formed metal part comprising:(a) supplying a metal alloy comprising at least 70 atomic % iron and at least four or more elements selected from Cr, Ni, Mn, Si, Cu, Al, 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 from 0.5 to 10 mm wherein said sheet exhibits a yield strength of A1 (MPa), an ultimate tensile strength of B1 (MPa), a true ultimate tensile strength C1 (MPa), and a total elongation D1;{'sup': 0', '2, 'claim-text': [{'br': None, 'i': A', 'A, '2=1±100;\u2003\u2003(i)'}, {'br': None, 'i': A', 'A', 'A', 'A, '3>1+100 and 3<1+600; and\u2003\u2003(ii)'}, {'br': None, 'i': A', 'A, '4≥1+600.\u2003\u2003(iii)'}], '(c) straining said sheet one or a plurality of times above said yield strength A1 at an ambient temperature of 1° C. to 50° C. and at a strain rate of 10/s to 10/sec and forming a metal part having a distribution of yield strengths A2, A3, and A4, wherein2. The method of wherein the said alloy in (a) contains at least 70 atomic percent iron is combined with four or more elements that are selected from Cr claim 1 , Ni claim 1 , Mn claim 1 , Al claim 1 , Si claim 1 , Cu claim 1 , or C.3. The method of wherein the said alloy in (a) contains at least 70 atomic percent iron is combined with five or more elements that are selected from Cr claim 1 , Ni claim 1 , Mn claim 1 , Al claim 1 , Si claim 1 , Cu claim 1 , or C.4. The method of wherein the said alloy in (a) contains at least 70 atomic percent iron is combined with six or more elements that are selected from Cr claim 1 , Ni claim 1 , Mn claim 1 , Al claim 1 ...
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