FORMING METHOD OF STEEL SHEET, MANUFACTURING EQUIPMENT FOR THE SAME, AND FORMED STRUCTURE

摘要

Provided is a formed structure of a steel sheet. The formed structure comprises: a surface part close to an exterior surface; and an inner center part surrounded by the surface part. In the surface part, a first phase has a maximum volume fraction and a second phase has a minimum volume fraction. In the center part, the second phase has a maximum volume fraction and the first phase has a minimum volume fraction.