Hot-stamped body
There is provided a hot-stamped body including: a steel base metal; and a metallic layer formed on a surface of the steel base metal, wherein the metallic layer includes: an interface layer that contains, in mass %, Al: 30.0 to 36.0%, has a thickness of 100 nm to 5 μm, and is located in an interface between the metallic layer and the steel base metal; and a principal layer that includes coexisting MgZn 2 phases and insular FeAl 2 phases, is located on the interface layer, and has a thickness of 3 μm to 40 μm.
1. A hot-stamped body comprising:
a steel base metal; and
a metallic layer formed on a surface of the steel base metal, wherein
the metallic layer includes an interface layer and a principal layer,
the interface layer contains, in mass%, Al: 30.0 to 36.0%, has a thickness of 100 nm to 5 μm, and is located in an interface between the metallic layer and the steel base metal,
the principal layer includes coexisting MgZn 2 phases and insular FeAl 2 phases, has a thickness of 3 μm to 40 μm, and is located on the interface layer, wherein an insular FeAl 2 phase is defined as an FeAl 2 phase having a ratio perimeter R of 2 or more, wherein R is defined as:
R=L/ 2 d ≥2
wherein 2d denotes a length of a projection of an FeAl 2 phase onto the interface between the metallic layer and the steel base metal, and L denotes a perimeter of the FeAl 2 phase;
an average composition of the metallic layer consists of, in mass%:
Al: 20.0 to 45.0%;
Fe: 10.0 to 45.0%;
Mg: 2.0 to 10.0%;
Sb: 0 to 0.5%;
Pb: 0 to 0.5%;
Cu: 0 to 1.0%;
Sn: 0 to 1.0%;
Ti: 0 to 1.0%;
Ca: 0 to 3.0%;
Sr: 0 to 0.5%;
Cr: 0 to 1.0%;
Ni: 0 to 1.0%;
Mn: 0 to 1.0%;
Si: 0 to 1.0%; and
12.0 to 45.0% of a combination of Zn and impurities,
in the principal layer, the MgZn 2 phases each contain, in mass%:
Mg: 13.0 to 20.0%.
Zn: 70.0 to 87.0%;
Al: 0 to 8.0%; and
Fe: 0 to 5.0%, and
in the principal layer, the FeAl 2 phases each contain, in mass%:
Al: 40.0 to 55.0%;
Fe: 40.0 to 55.0%; and
Zn: 0 to 15.0%.
2. The hot-stamped body according to claim 1 , wherein in the principal layer,
a volume fraction of the FeAl 2 phases is 50.0 to 80.0%, and
a volume fraction of the MgZn 2 phases is 20.0 to 50.0%.
3. The hot-stamped body according to claim 2 , wherein in the principal layer,
a volume fraction of the FeAl 2 phases is 60.0 to 75.0%, and
a volume fraction of the MgZn 2 phases is 25.0 to 45.0%.
4. The hot-stamped body according to claim 1 , wherein in the principal layer,
a volume fraction of the FeAl 2 phases is 60.0 to 75.0%, and
a volume fraction of the MgZn 2 phases is 25.0 to 45.0%.
5. A hot-stamped body comprising:
a steel base metal; and
a metallic layer formed on a surface of the steel base metal, wherein
the metallic layer includes an interface layer and a principal layer,
the interface layer contains, in mass%, Al: 30.0 to 36.0%, has a thickness of 100 nm to 5 μm, and is located in an interface between the metallic layer and the steel base metal,
the principal layer includes coexisting MgZn 2 phases and insular FeAl 2 phases, has a thickness of 3 μm to 40 μm, and is located on the interface layer, wherein an insular FeAl 2 phase is defined as an FeAl 2 phase having a ratio perimeter R of 2 or more, wherein R is defined as:
R=L/ 2 d ≥2
wherein 2d denotes a length of a projection of an FeAl 2 phase onto the interface between the metallic layer and the steel base metal, and L denotes a perimeter of the FeAl 2 phase;
an average composition of the metallic layer comprises, in mass%:
Al: 20.0 to 45.0%;
Fe: 10.0 to 45.0%;
Mg: 2.0 to 10.0%;
Sb: 0 to 0.5%;
Pb: 0 to 0.5%;
Cu: 0 to 1.0%;
Sn: 0 to 1.0%;
Ti: 0 to 1.0%;
Ca: 0 to 3.0%;
Sr: 0 to 0.5%;
Cr: 0 to 1.0%;
Ni: 0 to 1.0%;
Mn: 0 to 1.0%;
Si: 0 to 1.0%; and
12.0 to 45.0% of a combination of Zn and impurities,
in the principal layer, the MgZn 2 phases each contain, in mass%:
Mg: 13.0 to 20.0%;
Zn: 70.0 to 87.0%;
Al: 0 to 8.0%; and
Fe: 0 to 5.0%, and
in the principal layer, the FeAl 2 phases each contain, in mass%:
Al: 40.0 to 55.0%;
Fe: 40.0 to 55.0%; and
Zn: 0 to 15.0%.