-
公开(公告)号：US20230001466A1
公开(公告)日：2023-01-05
申请号：US17781325
申请日：2021-01-08
发明人： Yuri TODA , Kodai MURASAWA , Daisuke MAEDA , Kazuo HIKIDA
IPC分类号： B21D22/02 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/10 , C22C38/60 , C21D1/18
摘要： A hot-stamping formed body has a predetermined chemical composition and includes microstructure which includes residual austenite of which an area ratio is 10% or more and less than 20%, Among grain boundaries of crystal grains of bainite and tempered martensite a ratio of a length of a grain boundary having a rotation angle in a range of 55° to 75° to a total length of a grain boundary having a rotation angle in a range of 4° to 12°, a grain boundary having a rotation angle in a range of 49° to 54°, and the grain boundary having a rotation angle in, a range of 55° to 75° to the direction as a rotation axis is 30% or more.
-
公开(公告)号：US20220307103A1
公开(公告)日：2022-09-29
申请号：US17838868
申请日：2022-06-13
发明人： Shinichiro TABATA , Daisuke MAEDA
IPC分类号： C21D9/46 , B32B15/01 , C21D6/00 , C21D8/02 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/54 , C22C38/60 , C23C2/02 , C23C2/12 , C23C2/28 , C23C28/02
摘要： This coated steel member includes: a steel sheet substrate having a predetermined chemical composition; and a coating formed on a surface of the steel sheet substrate and containing Al and Fe, in which the coating has a low Al content region having an Al content of 3 mass % or more and less than 30 mass % and a high Al content region formed on a side closer to a surface than the low Al content region and having an Al content of 30 mass % or more, a maximum C content of the high Al content region is 25% or less of a C content of the steel sheet substrate, a maximum C content of the low Al content region is 40% or less of the C content of the steel sheet substrate, and a maximum C content in a range from an interface between the steel sheet substrate and the coating to a depth of 10 μm on a side of the steel sheet substrate is 80% or less of the C content of the steel sheet substrate.
-
公开(公告)号：US20240183017A1
公开(公告)日：2024-06-06
申请号：US18285505
申请日：2022-05-10
发明人： Yuri TODA , Daisuke MAEDA , Tamaki SUZUKI , Ko SATAKE , Yuma ASADA
IPC分类号： C22C38/60 , B21D22/02 , C21D8/02 , C21D9/46 , C22C38/00 , C22C38/20 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/30 , C22C38/32 , C22C38/44 , C22C38/48 , C22C38/50 , C22C38/54
CPC分类号： C22C38/60 , B21D22/022 , C21D8/0205 , C21D8/0226 , C21D8/0236 , C21D8/0263 , C21D9/46 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/008 , C22C38/20 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/30 , C22C38/32 , C22C38/44 , C22C38/48 , C22C38/50 , C22C38/54 , C21D2211/001 , C21D2211/005 , C21D2211/009
摘要： This hot-stamping formed body has a predetermined chemical composition and has a microstructure in which an average grain size of prior austenite grains is 5 to 25 μm, and a standard deviation of grain sizes of the prior austenite grains is 0.1 to 2.0 μm. In addition, this steel sheet for hot stamping has a predetermined chemical composition and has a microstructure in which an average value of the pole densities of ferrite in the orientation group consisting of {100} to {223} is 10.0 or less, in entire ferrite, a number proportion of ferrite containing a carbide having an equivalent circle diameter of 0.2 μm or more in grains is 20% or more, and the steel sheet for hot stamping has a microstructure in which an area ratio of pearlite is 10% to 90% and an ratio of ferrite is 10% to 90%.
-
公开(公告)号：US20230091784A1
公开(公告)日：2023-03-23
申请号：US17801134
申请日：2021-05-07
发明人： Yuri TODA , Daisuke MAEDA , Shingo FUJINAKA
IPC分类号： C22C38/18 , C22C38/16 , C22C38/14 , C22C38/12 , C22C38/08 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C21D9/46 , C21D8/02 , C21D6/00
摘要： 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} to {001} and a pole density of an orientation group consisting of {111} to {111} are controlled.
-
公开(公告)号：US20220403490A1
公开(公告)日：2022-12-22
申请号：US17779400
申请日：2021-01-15
发明人： Shingo FUJINAKA , Daisuke MAEDA , Yuri TODA
IPC分类号： C22C38/38 , C22C38/26 , C22C38/14 , C22C38/12 , C22C38/10 , C22C38/08 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C21D9/48 , C21D8/04 , C21D6/00 , B21D22/02
摘要： A hot stamped body with high strength and good bendability, comprising a chemical composition consisting of: in mass %, C: 0.06% or more to less than 0.20%, Si: 0.010 to 1.00%, Mn: 1.20 to 3.00%, P: 0.100% or less, S: 0.010% or less, Al: 0.010 to 0.500%, N: 0.010% or less, Nb: 0.0010 to 0.020%, Ti: 0 to 0.10%, V: 0 to 0.10%, Cr: 0 to 0.50%, Mo: 0 to 1.00%, B: 0 to 0.0100%, Ni: 0 to 0.50%, REM: 0 to 0.0100%, Mg: 0 to 0.010%, Ca: 0 to 0.0100%, and Co: 0 to 2.0%, with the balance: Fe and impurities, wherein a microstructure includes martensite: 85% or more, a proportion of regions in the martensite where GAIQ values are 35000 or more to less than 45000 is 30 area % or more, and TS×α, is 105000 or more, and α is 75 or more.
-
公开(公告)号：US20220195567A1
公开(公告)日：2022-06-23
申请号：US17603270
申请日：2020-05-13
发明人： Daisuke MAEDA , Yuri TODA , Kazuo HIKIDA
摘要： 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/m2 to 90 g/m2 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 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.
-
公开(公告)号：US20220195557A1
公开(公告)日：2022-06-23
申请号：US17599935
申请日：2020-05-13
发明人： Daisuke MAEDA , Yuri TODA , Tomohito TANAKA , Kazuo HIKIDA
IPC分类号： C21D9/48 , B32B15/01 , C22C18/00 , C22C38/32 , C22C38/28 , C22C38/26 , C22C38/06 , C22C38/38 , C22C38/02 , C22C38/00 , C21D8/04 , C21D6/00 , C21D1/18
摘要： 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/m2 to 90 g/m2 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, an average grain size of prior austenite grains to 10.0 μm or less, a Ni concentration per unit area at grain boundaries having an average crystal orientation difference of 15° or more is 1.5 mass %/μm2 or more.
-
公开(公告)号：US20200232056A1
公开(公告)日：2020-07-23
申请号：US16486958
申请日：2018-02-20
发明人： Yuri TODA , Genki ABUKAWA , Daisuke MAEDA , Kazuo HIKIDA
IPC分类号： C21D9/46 , B32B15/01 , C23C2/06 , C23C2/28 , C23C2/40 , C21D8/02 , C21D6/00 , C22C38/14 , C22C38/12 , C22C38/08 , C22C38/04 , C22C38/02 , C22C38/00 , C22C38/06
摘要： The present invention provides a hot stamped body excellent in bendability, ductility, impact resistance, and hydrogen embrittlement resistance and small in scattering in hardness. The hot stamped body according to the present invention is provided with a middle part in sheet thickness and a softened layer arranged at both sides or one side of the middle part in sheet thickness. The middle part in sheet thickness has a hardness of 500 Hv to 800 Hv and has metal structures from a depth of 20 μm below the surface of the softened layer to a depth of ½ of the thickness of the softened layer with an area rate of a total of crystal grains with a maximum crystal orientation difference inside the crystal grains of 1° or less and crystal grains with a maximum crystal orientation difference inside the crystal grains of 8° or more and 15° or less of 20% or more and less than 50%, when a region surrounded by grain boundaries having an orientation difference of 15° or more in a cross-section parallel to the sheet thickness direction is defined as a “crystal grain”.
-
公开(公告)号：US20200230681A1
公开(公告)日：2020-07-23
申请号：US16487036
申请日：2018-02-20
发明人： Yuri TODA , Genki ABUKAWA , Daisuke MAEDA , Kazuo HIKIDA , Shingo FUJINAKA
摘要： The present invention, in consideration of the problems in the prior art, provides a hot stamped body simultaneously achieving the high bendability and high ductility for realizing impact resistance and also hydrogen embrittlement resistance and kept down in scattering in hardness. The hot stamped body according to the present invention is provided with a middle part in sheet thickness and a softened layer arranged at both sides or one side of the middle part in sheet thickness. The middle part in sheet thickness has a hardness of 500Hv to 800Hv and has metal structures from a depth of 20 μm below the surface of the softened layer to a depth of ½ of the thickness of the softened layer with an area rate of a total of crystal grains with a maximum crystal orientation difference inside the crystal grains of 1° or less and crystal grains with a maximum crystal orientation difference inside the crystal grains of 8° or more and 15° or less of 50% or more and less than 85%, when a region surrounded by grain boundaries having an orientation difference of 15° or more in a cross-section parallel to the sheet thickness direction is defined as a “crystal grain”.
-
公开(公告)号：US20230081832A1
公开(公告)日：2023-03-16
申请号：US17801145
申请日：2021-05-07
发明人： Daisuke MAEDA , Yuri TODA , Shingo FUJINAKA
IPC分类号： C22C38/18 , B21D22/02 , C22C38/14 , C22C38/12 , C22C38/16 , C22C38/08 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00
摘要： These steel sheet for hot stamping and hot-stamping formed body have predetermined chemical composition and metallographic structures, and, in textures of a surface layer region and an inside region, ratios between a pole density of an orientation group consisting of {001} to {001} and a pole density of an orientation group consisting of {111} to {111} are controlled.
-
-
-
-
-
-
-
-
-
搜索结果
25 条记录 (耗时 0.016 秒)
