Hot-stamping formed body
This hot-stamping formed body has a predetermined chemical composition and has a metallographic structure consisting of, by area ratio, a total of 10% to 30% of ferrite and granular bainite and a remainder in microstructure consisting of one or more of martensite, bainite, and tempered martensite, and, in textures of a surface layer region and an inside region, ratios between a pole density of an orientation group consisting of {001}<1-10> to {001}<−1-10> and a pole density of an orientation group consisting of {111}<1-10> to {111}<−1-12> are controlled.
1. A hot-stamping formed body comprising, as a chemical composition, by mass %:
C: 0.15 to 0.50%;
Si: 0.0010% to 3.000%;
Mn: 0.30% to 3.00%;
Al: 0.0002% to 2.000%;
P: 0.100% or less;
S: 0.1000% or less;
N: 0.0100% or less;
Nb: 0% to 0.15%;
Ti: 0% to 0.15%;
V: 0% to 0.15%;
Mo: 0% to 1.0%;
Cr: 0% to 1.0%;
Cu: 0% to 1.0%;
Ni: 0% to 1.0%;
B: 0% to 0.0100%;
Ca: 0% to 0.010%;
REM: 0% to 0.30%; and
a remainder consisting of Fe and an impurity,
wherein the hot-stamping formed body has a metallographic structure consisting of, by area ratio, a total of 10% to 30% of ferrite and granular bainite and a remainder in microstructure consisting of one or more of martensite, bainite, and tempered martensite,
in a texture between a surface and a sheet thickness ¼ position from the surface, a ratio between a pole density of an orientation group consisting of {001}<1-10> to {001}<−1-10> and a pole density of an orientation group consisting of {111}<1-10> to {111}<−1-12> is less than 1.8, and
in a texture between the sheet thickness ¼ position from the surface and a sheet thickness ½ position from the surface, a ratio between a pole density of an orientation group consisting of {001}<1-10> to {001}<−1-10> and a pole density of an orientation group consisting of {111} <1-10> to {111}<−1-12> is less than 2.3.
2. The hot-stamping formed body according to claim 1 , further comprising, as the chemical composition, by mass %, one or more of the group:
Nb: 0.05% to 0.15%,
Ti: 0.05% to 0.15%,
V: 0.05% to 0.15%,
Mo: 0.05% to 1.0%,
Cr: 0.05% to 1.0%,
Cu: 0.05% to 1.0%,
Ni: 0.05% to 1.0%,
B: 0.0001% to 0.0100%,
Ca: 0.001% to 0.010%, and
REM: 0.001% to 0.30%.
3. The hot-stamping formed body according to claim 1 ,
wherein a decarburization index is 0.085 or more.
4. The hot-stamping formed body according to claim 2 ,
wherein a decarburization index is 0.085 or more.
5. A hot-stamping formed body comprising, as a chemical composition, by mass %:
C: 0.15 to 0.50%;
Si: 0.0010% to 3.000%;
Mn: 0.30% to 3.00%;
Al: 0.0002% to 2.000%;
P: 0.100% or less;
S: 0.1000% or less;
N: 0.0100% or less;
Nb: 0% to 0.15%;
Ti: 0% to 0.15%;
V: 0% to 0.15%;
Mo: 0% to 1.0%;
Cr: 0% to 1.0%;
Cu: 0% to 1.0%;
Ni: 0% to 1.0%;
B: 0% to 0.0100%;
Ca: 0% to 0.010%;
REM: 0% to 0.30%; and
a remainder comprising Fe and an impurity,
wherein the hot-stamping formed body has a metallographic structure comprising, by area ratio, a total of 10% to 30% of ferrite and granular bainite and a remainder in microstructure comprising one or more of martensite, bainite, and tempered martensite,
in a texture between a surface and a sheet thickness ¼ position from the surface, a ratio between a pole density of an orientation group comprising {001}<1-10> to {001}<−1-10> and a pole density of an orientation group comprising {111}<1-10> to {111}<−1-12> is less than 1.8, and
in a texture between the sheet thickness ¼ position from the surface and a sheet thickness ½ position from the surface, a ratio between a pole density of an orientation group comprising {001}<1-10> to {001}<−1-10> and a pole density of an orientation group comprising {111}<1-10> to {111}<−1-12> is less than 2.3.