METHOD OF FORMING STEEL SHEET, EQUIPMENT FOR FORMING THE SAME, AND FORMED PRODUCT
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United States of America Patent
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Jul 3, 2015
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Jul 4, 2014
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Abstract
A formed product of a steel sheet is provided. The formed product includes a surface portion adjacent to an exterior surface and a central portion surrounded by the surface portion. A first phase has a maximum volume fraction in the surface portion, and a second phase has a minimum volume fraction in the surface portion. The second phase has a maximum volume fraction in the central portion, and the first phase has a minimum volume fraction in the central portion.
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