公开(公告)号：US11332804B2

公开(公告)日：2022-05-17

申请号：US16966762

申请日：2019-01-21

申请人： JFE STEEL CORPORATION

发明人： Seigo Tsuchihashi ,  Shinsuke Komine ,  Tatsuya Nakagaito ,  Hidekazu Minami

IPC分类号： C21D9/46 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/10 ,  C22C38/12 ,  C22C38/14 ,  C22C38/20 ,  C22C38/32 ,  C22C38/60 ,  C23C2/06

摘要： A high-strength cold-rolled steel sheet or high-strength coated steel sheet that has a tensile strength (TS) of 780 MPa or more and has high ductility, stretch-flangeability, and in-plane stability of stretch-flangeability and methods for producing the same. The high-strength cold-rolled steel sheet has a specified chemical composition and a microstructure comprising, by area fraction, in a range of 50% to 80% of ferrite, 8% or less of martensite with an average grain size of 2.5 μm or less, in a range of 6% to 15% of retained austenite, and in a range of 3% to 40% of tempered martensite. A ratio fM/fM+TM being 50% or less, where fM denotes the area fraction of martensite and fM+TM denotes the total area fraction of martensite and tempered martensite, and a standard deviation of the grain size of martensite at certain portions being 0.7 μm or less.

公开(公告)号：US11315710B2

公开(公告)日：2022-04-26

申请号：US15617510

申请日：2017-06-08

申请人： Shin-Etsu Chemical Co., Ltd.

发明人： Koichi Hirota ,  Tetsuya Kume ,  Masayuki Kamata

IPC分类号： H01F1/059 ,  B22F3/16 ,  B22F3/24 ,  H01F41/00 ,  H01F41/02 ,  C22C38/16 ,  C22C38/14 ,  C22C38/10 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00 ,  C21D6/00 ,  H01F1/057

摘要： An R—Fe—B base sintered magnet is provided consisting essentially of R (which is at least two rare earth elements and essentially contains Nd and Pr), M1 which is at least two of Si, Al, Mn, Ni, Cu, Zn, Ga, Ge, Pd, Ag, Cd, In, Sn, Sb, Pt, Au, Hg, Pb, and Bi, M2 which is at least one of Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, and W, boron, and the balance of Fe, and containing an intermetallic compound R2(Fe,(Co))14B as a main phase. The magnet contains an R—Fe(Co)-M1 phase as a grain boundary phase, the R—Fe(Co)-M1 phase contains A phase which is crystalline with crystallites of at least 10 nm formed at grain boundary triple junctions, and B phase which is amorphous and/or nanocrystalline with crystallites of less than 10 nm formed at intergranular grain boundaries and optionally grain boundary triple junctions.

公开(公告)号：US11309108B2

公开(公告)日：2022-04-19

申请号：US16818308

申请日：2020-03-13

申请人： TDK Corporation

发明人： Hikaru Kudo

IPC分类号： H01F1/057 ,  H01F41/02 ,  H01F7/02 ,  C22C38/16 ,  C22C38/00 ,  C22C38/10

摘要： A permanent magnet includes Nd, Fe, B, and Ga and contains a first T rich phase 1, a second T rich phase 3, and a T poor phase 5 as grain boundary phases, the first T rich phase 1 satisfies 1.7≤[T]/[R]≤3.0, the second T rich phase 3 satisfies 0.8≤[T]/[R]≤1.5, the T poor phase 5 satisfies 0.0≤[T]/[R]≤0.6, and the following Formulas 4 and 5 are satisfied. [T] represents the concentration (atom %) of Fe and Co, [R] represents the concentration (atom %) of Nd, Pr, Tb, and Dy, S1 represents the area of the first T rich phase 1 exposed at a cross-section of the permanent magnet, S2 represents the area of the second T rich phase 3 exposed at the cross-section, and S3 represents the area of the T poor phase 5 exposed at the cross-section. 0.30≤(S1+S2)/(S1+S2+S3)≤0.80  (4) 0.20≤S2/(S1+S2)≤0.80  (5)

公开(公告)号：US20220076865A1

公开(公告)日：2022-03-10

申请号：US17530735

申请日：2021-11-19

申请人： Murata Manufacturing Co., Ltd.

发明人： Satoshi OGA

IPC分类号： H01F1/059 ,  C22C38/14 ,  C22C38/10 ,  C22C38/00

摘要： A samarium-iron-nitrogen-based magnetic material containing Sm, Fe, N, Ti, and Co at a content of 2.5 at % or less. A content of the Sm may be 7 at % to 10 at %, a content of the Fe may be 65 at % to 80 at %, a content of the N may be 13 at % to 16 at %, and a content of the Ti may be 0.5 at % to 1.5 at %.

公开(公告)号：US11213890B2

公开(公告)日：2022-01-04

申请号：US16325865

申请日：2017-08-16

申请人： URBAN MINING TECHNOLOGY COMPANY, INC.

发明人： Miha Zakotnik ,  Davide Prosperi ,  Gojmir Furlan ,  Catalina O. Tudor ,  Alex Ivor Bevan

IPC分类号： H01F1/055 ,  B22F1/00 ,  C22C38/16 ,  C22C38/00 ,  B22F9/08 ,  H01F1/057 ,  H01F1/058 ,  C22C38/10 ,  H01F41/02 ,  B22D11/06 ,  B22D11/22 ,  C22C28/00

摘要： The present disclosure is directed to methods of preparing substantially spherical metallic alloyed particles, having micron and sub-micron (i.e., nanometer)-scaled dimensions, and the powders so prepared, as well as articles derived from these powders. In particular embodiments, these metallic alloyed particles, comprising rare earth metals, can be prepared in sizes as small 80 nm in diameter with size variances as low as 2-5%.

公开(公告)号：US20210395852A1

公开(公告)日：2021-12-23

申请号：US17285013

申请日：2019-10-21

申请人： NIPPON STEEL CORPORATION

发明人： Tatsuo YOKOI ,  Hiroshi SHUTO ,  Teruki HAYASHIDA ,  Jun ANDO ,  Mutsumi SAKAKIBARA

IPC分类号： C21D9/46 ,  C22C38/58 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/10 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00 ,  C23G1/08 ,  C21D8/02 ,  C21D6/00

摘要： This hot-rolled steel sheet has a predetermined chemical composition, in which in a case where the thickness is denoted by t, a metallographic structure at a t/4 position from the surface includes, by area fraction, 77.0% to 97.0% of bainite or tempered martensite, 0% to 5.0% of ferrite, 0% to 5.0% of pearlite, 3.0% or more of residual austenite, and 0% to 10.0% of martensite, in the metallographic structure, the average grain size excluding the residual austenite is 7.0 μm or less, the average number density of iron-based carbides having a diameter of 20 nm or more is 1.0×106 carbides/mm2 or more, a tensile strength is 980 MPa or more, and an average Ni concentration on the surface is 7.0% or more.

公开(公告)号：US20210355569A1

公开(公告)日：2021-11-18

申请号：US16495732

申请日：2018-03-29

申请人： NIPPON STEEL CORPORATION

发明人： Masaaki FUJIOKA ,  Tetsuya NAMEGAWA ,  Masahide YOSHIMURA ,  Masanori MINAGAWA

IPC分类号： C22C38/38 ,  C22C38/28 ,  C22C38/24 ,  C22C38/22 ,  C22C38/20 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/10 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D9/46 ,  C21D8/02 ,  C21D6/00

摘要： An austenitic wear-resistant steel plate according to an aspect of the present invention has a predetermined chemical composition, amounts of C and Mn by mass % satisfy −13.75×C+16.5≤Mn≤−20×C+30, the volume fraction of austenite in a metallographic structure is 40% or more and less than 95%, and the average grain size of the austenite is 40 to 300 μm.

公开(公告)号：US11161175B2

公开(公告)日：2021-11-02

申请号：US16340031

申请日：2017-10-06

申请人： REGENTS OF THE UNIVERSITY OF MINNESOTA

发明人： Jian-Ping Wang ,  Bin Ma ,  Jinming Liu ,  Yiming Wu ,  YanFeng Jiang

IPC分类号： B22F1/02 ,  B22F1/00 ,  H01F1/055 ,  H01F1/059 ,  B22F9/04 ,  C23C8/26 ,  C23C8/50 ,  C23C8/80 ,  C22C38/00 ,  C22C38/10

摘要： Example nanoparticles may include an iron-based core, and a shell. The shell may include a non-magnetic, anti-ferromagnetic, or ferrimagnetic material. Example alloy compositions may include an iron-based grain, and a grain boundary. The grain boundary may include a non-magnetic, anti-ferromagnetic, or ferrimagnetic material. Example techniques for forming iron-based core-shell nanoparticles may include depositing a shell on an iron-based core. The depositing may include immersing the iron-based core in a salt composition for a predetermined period of time. The depositing may include milling the iron-based core with a salt composition for a predetermined period of time. Example techniques for treating a composition comprising core-shell nanoparticles may include nitriding the composition.

公开(公告)号：US20210304929A1

公开(公告)日：2021-09-30

申请号：US17202424

申请日：2021-03-16

申请人： TDK Corporation

发明人： Masashi MIWA ,  Yoshitomo TANAKA ,  Koji MIURA ,  Taeko TSUBOKURA

IPC分类号： H01F1/057 ,  C22C38/00 ,  C22C38/16 ,  C22C38/10 ,  C22C38/06 ,  C22C38/14

摘要： Provided is a permanent magnet including a rare-earth element R (such as Nd), a transition metal element T (such as Fe), B, Zr, and Cu. The permanent magnet contains a plurality of main phase grains including Nd, T, and B, and grain boundary multiple junctions, the one grain boundary multiple junction is a grain boundary surrounded by three or more of the main phase grains, one of the grain boundary multiple junctions contains a ZrB2 crystal and an R—Cu-rich phase including R and Cu, Fe is contained in the ZrB2 crystal, a total concentration of Nd and Pr in the one grain boundary multiple junction containing both the ZrB2 crystal and the R—Cu-rich phase is higher than a total concentration of Nd and Pr in the main phase grain, a concentration of Cu in the one grain boundary multiple junction containing both the ZrB2 crystal and the R—Cu-rich phase is higher than a concentration of Cu in the main phase grain, and a unit of the concentration of each of Nd, Pr, and Cu is atomic %.

公开(公告)号：US11120932B2

公开(公告)日：2021-09-14

申请号：US14205894

申请日：2014-03-12

申请人： TODA KOGYO CORP.

发明人： Nobuhiro Katayama ,  Hirofumi Kawasaki ,  Koichiro Morimoto

IPC分类号： H01F1/057 ,  C21D6/00 ,  B22F9/04 ,  C22C38/06 ,  C22C33/02 ,  C22C38/00 ,  C22C38/10 ,  C22C38/14

摘要： An object of the present invention is to enhance a coercive force of magnetic particles by promoting formation of a continuous R-rich grain boundary phase in a crystal grain boundary of a magnetic phase of the particles, and to thereby obtain R-T-B-based rare earth magnet particles further having a high residual magnetic flux density. The present invention relates to production of R-T-B-based rare earth magnet particles capable of exhibiting a high coercive force even when a content of Al therein is reduced, and a high residual magnetic flux density, in which formation of an R-rich grain boundary phase therein can be promoted by heat-treating Al-containing R-T-B-based rare earth magnet particles obtained by HDDR treatment in vacuum or in an Ar atmosphere at a temperature of not lower than 670° C. and not higher than 820° C. for a period of not less than 30 min and not more than 300 min.