High-strength member, method for manufacturing high-strength member, and method for manufacturing steel sheet for high-strength member

A high-strength member formed from a steel sheet, the member comprising:

• a bent ridge portion having an edge surface,
• wherein:
• the member has a tensile strength of 1470 MPa or more,
• the edge surface of the bent ridge portion has a residual stress of 800 MPa or less,
• a longest crack among cracks that extend from the edge surface of the bent ridge portion in a bent ridge direction has a length of 10 μm or less, and
• the steel sheet has a chemical composition comprising, by mass %:
• C:
• 0.17% or more and 0.35% or less;
• Si:
• 0.001% or more and 1.2% or less;
• Mn:
• 0.9% or more and 3.2% or less;
• P:
• 0.02% or less;
• S:
• 0.001% or less;
• Al:
• 0.01% or more and 0.2% or less;
• N:
• 0.010% or less;
• and
• the balance being Fe and incidental impurities.