Hot-stamping formed body
A hot-stamping formed body includes: a steel sheet having a predetermined chemical composition; and a plating layer provided on a surface of the steel sheet, the plating layer having an adhesion amount of 10 g/m 2 to 90 g/m 2 and a Ni content of 10 mass % to 25 mass %, and containing a remainder consisting of Zn and impurities. The hot-stamping formed body includes, in a surface layer region of the steel sheet, a metallographic structure has one or more of martensite, tempered martensite, and lower bainite as a primary phase, and with respect to the sum of the lengths of grain boundaries having a rotation angle of 57° to 63°, the lengths of grain boundaries having a rotation angle of 49° to 56°, the lengths of grain boundaries having a rotation angle of 4° to 12°, and the lengths of grain boundaries having a rotation angle of 64° to 72° with a <011> direction as a rotation axis among the grain boundaries of grains having a phase of a body-centered structure, the ratio of the lengths of the grain boundaries having a rotation angle of 64° to 72° is 35% or more.
1. A hot-stamping formed body comprising:
a steel sheet containing, as a chemical composition, by mass %,
C: 0.15% or more and less than 0.70%,
Si: 0.005% to 0.250%,
Mn: 0.30% to 3.00%,
sol. Al: 0.0002% to 0.500%,
P: 0.100% or less,
S: 0.1000% or less,
N: 0.0100% or less,
Nb: 0% to 0.150%,
Ti: 0% to 0.150%,
Mo: 0% to 1.000%,
Cr: 0% to 1.000%,
B: 0% to 0.0100%,
Ca: 0% to 0.010%,
REM: 0% to 0.30%, and
a remainder consisting of Fe and impurities; and
a plating layer provided on a surface of the steel sheet, the plating layer having an adhesion amount of 10 g/m 2 to 90 g/m 2 and a Ni content of 10 mass % to 25 mass %, and containing a remainder consisting of Zn and impurities,
wherein, in a surface layer region, which is a region from the surface of the steel sheet to a position at a depth of 50 μm from the surface, a metallographic structure has one or more of martensite, tempered martensite, and lower bainite as a primary phase, and with respect to the sum of the lengths of grain boundaries having a rotation angle of 57° to 63°, the lengths of grain boundaries having a rotation angle of 49° to 56°, the lengths of grain boundaries having a rotation angle of 4° to 12°, and the lengths of grain boundaries having a rotation angle of 64° to 72° with a <011> direction as a rotation axis among the grain boundaries of grains having a phase of a body-centered structure, the ratio of the lengths of the grain boundaries having a rotation angle of 64° to 72° is 35% or more.
2. The hot-stamping formed body according to claim 1 , comprising, as the chemical composition, by mass %, one or more selected from the group of:
Nb: 0.010% to 0.150%;
Ti: 0.010% to 0.150%;
Mo: 0.005% to 1.000%;
Cr: 0.005% to 1.000%;
B: 0.0005% to 0.0100%;
Ca: 0.0005% to 0.010%; and
REM: 0.0005% to 0.30%.
3. A hot-stamping formed body comprising:
a steel sheet containing, as a chemical composition, by mass %,
C: 0.15% or more and less than 0.70%,
Si: 0.005% to 0.250%,
Mn: 0.30% to 3.00%,
sol. Al: 0.0002% to 0.500%,
P: 0.100% or less,
S: 0.1000% or less,
N: 0.0100% or less,
Nb: 0% to 0.150%,
Ti: 0% to 0.150%,
Mo: 0% to 1.000%,
Cr: 0% to 1.000%,
B: 0% to 0.0100%,
Ca: 0% to 0.010%,
REM: 0% to 0.30%, and
a remainder comprising Fe and impurities; and
a plating layer provided on a surface of the steel sheet, the plating layer having an adhesion amount of 10 g/m 2 to 90 g/m 2 and a Ni content of 10 mass % to 25 mass %, and containing a remainder comprising Zn and impurities,
wherein, in a surface layer region, which is a region from the surface of the steel sheet to a position at a depth of 50 μm from the surface, a metallographic structure has one or more of martensite, tempered martensite, and lower bainite as a primary phase, and with respect to the sum of the lengths of grain boundaries having a rotation angle of 57° to 63°, the lengths of grain boundaries having a rotation angle of 49° to 56°, the lengths of grain boundaries having a rotation angle of 4° to 12°, and the lengths of grain boundaries having a rotation angle of 64° to 72° with a <011> direction as a rotation axis among the grain boundaries of grains having a phase of a body-centered structure, the ratio of the lengths of the grain boundaries having a rotation angle of 64° to 72° is 35% or more.