公开(公告)号：US11261504B2

公开(公告)日：2022-03-01

申请号：US16252908

申请日：2019-01-21

Applicant: University of Science and Technology Beijing

Inventor： Haiwen Luo ,  Pengyu Wen

IPC: C21D9/46 ,  C21D8/02 ,  C21D6/00 ,  C22C38/54 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00

Abstract: A method for producing ultra-high strength martensitic cold-rolled steel sheet adopts pulsed ultra-rapid heating of cold-rolled martensitic steel sheets after smelting, solidification, hot rolling, billet or ingot casting, as well as conventional manufacturing processes such as hot continuous rolling and winding, pickling, and room temperature cold rolling. The steel sheets are rapidly heated at a heating rate of 100-500° C./s to a single-phase region of austenite, and then the samples are immediately water-cooled to obtain martensite structure without undergoing heat preservation or a very short holding time. The tensile strength of the martensitic steel is in the range of 1800-2300 MPa, and the total elongation can reach 12.3%. Compared with the continuous annealing product of the same martensitic steel, the tensile strength is increased by 700 MPa or more, and the maximum increase of total elongation is 6%.

公开(公告)号：US11203792B2

公开(公告)日：2021-12-21

申请号：US16052640

申请日：2018-08-02

Applicant: University of Science and Technology Beijing

Inventor： Qingzhi Yan ,  Zhiyuan Hong

IPC: C21D8/00 ,  C21D6/00 ,  C22C38/32 ,  C22C38/28 ,  C22C38/24 ,  C22C38/22 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C22C38/26

Abstract: A method for preparing oxide dispersion strengthening F/M steel using smelting and casting process, which belongs to the field of metal materials. The composition of the steel comprises: C: 0.08-0.15%, Cr: 8.0-14%, Mn: 0.45-0.6%, W: 1.0-2.5%, N: 0.05-0.07%, Ta: 0.010-0.20%, Ti: 0.02-0.55%, Si: 0.10-0.15%, V: 0.04-0.5%, O: 30-200 ppm, B

公开(公告)号：US11192176B1

公开(公告)日：2021-12-07

申请号：US17226019

申请日：2021-04-08

Applicant: UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING

Inventor： Qing Liu ,  Yanshen Han ,  Jiangshan Zhang

IPC: B22D11/124 ,  B22D11/14 ,  B22D11/22 ,  B22D11/128

Abstract: A method for improving center segregation and surface crack of continuous casting medium-thick slab of peritectic steel reduces the cooling intensity at the earlier stage of solidification and enhancing the cooling intensity at the final stage of solidification. For example, the cooling water amount of the wide face of the mould is 3400-3600 L/min, and the cooling water amount of the narrow face of the mould is 480-530 L/min. The cooling water amount of the wide face of the foot roller section is 239-298 L/min, and the cooling water amount of the narrow face of the foot roller section is 61-65 L/min. The total cooling water amount of the sector segment is 1517-2166 L/min.

公开(公告)号：US20210363603A1

公开(公告)日：2021-11-25

申请号：US17021404

申请日：2020-09-15

Applicant: University of Science and Technology Beijing

Inventor： Jinfeng HUANG ,  Jin ZHANG ,  Cheng ZHANG ,  Chao ZHAO ,  Yong LIAN ,  Jianqiang LI ,  Cheng ZHANG

IPC: C21D9/00 ,  C21D8/00 ,  C21D6/00 ,  C21D1/28 ,  C22C1/02 ,  C22C38/54 ,  C22C38/52 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  B22C9/06 ,  B21D37/10

Abstract: The present application provides a hot-work die steel and a preparation method thereof, wherein the chemical constituents of the hot-work die steel in mass percentage are as follows: C: 0.20-0.32 wt %, Si: ≤0.5 wt %, Mn: ≤0.5 wt %, Cr: 1.5-2.8 wt %, Mo: 1.5-2.5 wt %, W: 0.5-1.2 wt %, Ni: 0.5-1.6 wt %, V: 0.15-0.7 wt %, Nb: 0.01-0.1 wt %, and a balance of iron, wherein an alloying degree is 5-7%; a tensile strength of the hot-work die steel at 700° C. is 560-700 MPa; a value of hardness of the hot-work die steel at room temperature is 32-38 HRC after holding at 700° C. for 3-5 h; and the hot-work die steel has an elongation of 14% to 16% at room temperature, a percentage reduction of area of 48% to 65%, and an impact toughness of 52-63 J at room temperature. The hot-work die steel of the present application has an excellent thermal stability as well as a good plasticity and a toughness at room temperature.

公开(公告)号：US20210357195A1

公开(公告)日：2021-11-18

申请号：US17444054

申请日：2021-07-29

Applicant: UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING

Inventor： Yan ZHU ,  Di WANG ,  Bohan QIN ,  Weijing SONG

IPC: G06F8/51 ,  G06F8/41 ,  G06F8/60 ,  G06Q50/18 ,  H04L9/32

Abstract: A method for executable smart legal contract construction and execution over legal contracts includes several steps. 1) Use the specified smart contract language to formally represent attributes and terms in natural language contracts, further generate smart contracts. 2) Use the conversion rules over target language to translate the smart legal contracts into executable target language contracts. 3) Each of target language contracts is compiled, further encapsulated as a blockchain transaction which is issued into blockchain via consensus protocol. The deployment of the contracts is completed once the contracting parties sign the target language contracts. 4) Once term of the smart legal contract is triggered, the corresponding functions of the target language contract will be executed by the blockchain nodes, and the execution results are issued to blockchain in a blockchain transaction form. After validation, the transaction is stored into blockchain as an electronic certification of contract execution.

公开(公告)号：US20210197264A1

公开(公告)日：2021-07-01

申请号：US17200475

申请日：2021-03-12

Applicant: UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING

Inventor： Gang CHEN ,  Mingli QIN ,  Qiying TAO ,  Xuanhui QU

IPC: B22F9/04 ,  B33Y70/00 ,  B01J2/16 ,  B22F1/00

Abstract: A method of preparation of titanium and titanium alloy powder for 3D printing is based on a fluidized bed jet milling technique. Hydride-dehydrate titanium powder and titanium alloy powder are used as main raw material powder, jet milling and shaping are carried out in shielding atmosphere of nitrogen or argon, and finally high-performance titanium and titanium alloy powder meeting the requirements of 3D printing process is obtained. The titanium and titanium alloy powder prepared using this method has a narrow particle size distribution, approximately spherical shape, and controllable oxygen content.

公开(公告)号：US20210095360A1

公开(公告)日：2021-04-01

申请号：US16634909

申请日：2018-09-19

Applicant: UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING ,  BOEING (CHINA) CO., LTD.

Inventor： Shengen ZHANG ,  Bo LIU ,  Rui LIN

IPC: C22C1/02 ,  B22D21/00 ,  B22D43/00 ,  C22C1/03 ,  B22C9/08 ,  C22B21/00 ,  C22B21/06

Abstract: The present invention relates to techniques for producing 2024 and 7075 aluminum alloys by recycling waste aircraft aluminum alloys, which belong to technical fields for circular economy. The present invention develops techniques for obtaining the 2024 and 7075 aluminum alloys by subjecting waste aircraft aluminum alloys as raw materials to pretreatment, smelting, impurity removal, melt ingredient assay, ingredient adjustment, refining, and casting. Through utilizing the waste package aluminum alloys and the waste aluminum pop-top cans to adjust the ingredients, the waste aircraft aluminum alloys would be recycled at a lower cost without downgrading. The present invention has some advantages, such as low cost, and applicability for industrial production, as well as prominent economic benefit.

公开(公告)号：US10913110B2

公开(公告)日：2021-02-09

申请号：US16169570

申请日：2018-10-24

Applicant: UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING

Inventor： Jingyuan Li ,  Mingfan Qi ,  Yulai Chen ,  Huiping Hong ,  Jianxin Xie

IPC: B22D11/16 ,  B22D25/06 ,  B22D11/114 ,  B29C67/00 ,  B22D11/10 ,  B33Y30/00 ,  B33Y10/00 ,  B33Y70/00 ,  B22D11/00 ,  B22D11/124 ,  B22D11/22 ,  B22D17/20 ,  B22D30/00 ,  C22C1/04

Abstract: An apparatus for a high-throughput screw caster of a multi-component gradient metal material from elongate materials, such as multi-component alloy pipes, rods, profiles, and other such materials, has in the lengthwise direction a continuous gradient distribution of chemical components. The apparatus includes an online powder flow-rate regulation system, a rotary feed system, a heating system, a heat insulation system, a motor drive system, a blank forming system and a control system.

公开(公告)号：US20210017051A1

公开(公告)日：2021-01-21

申请号：US16920643

申请日：2020-07-03

Applicant: University of Science and Technology Beijing ,  Beijing Mild Technology Co., Ltd.

Inventor： Suqin LI ,  Shuaishuai HAN ,  Xin ZHAO ,  Guohong XIONG

IPC: C02F1/48 ,  C02F1/52

Abstract: There is provided a method for controlling bio-slimes in a clean circulating water system through a physical-chemical-superconducting high gradient magnetic separation coupling process. An inorganic composite flocculant is added to circulating water to gather Zoogloea in the circulating water with micro-nano particles in hydrosol through demulsification to form alum floc. The resulting water passes through a superconducting high gradient magnetic separation system. A magnetic field strength of the superconducting high gradient magnetic separation system and flow rate of the circulating water are controlled to generate strong magnetic flocculation to allow floc to grow, such that the Zoogloea in the circulating water wraps the micro-nano particles to separate the Zoogloea from water.

公开(公告)号：US20210003005A1

公开(公告)日：2021-01-07

申请号：US16620657

申请日：2018-09-21

Applicant: University of Science and Technology Beijing

Inventor： Weiyao ZHU ,  Zhiyong SONG ,  Ming YUE ,  Yunfeng LIU ,  Zhen CHEN ,  Dongxu MA ,  Wenchao LIU ,  Qian Qi

IPC: E21B49/02 ,  G01V99/00 ,  G01N3/08

Abstract: A method for identifying a medium structure coupling and a fracture network morphology of a shale gas reservoir includes the following steps. Firstly, performing a fracturing test on shale cores by using a modified Brazilian disc test and categorizing the fracture network morphology. Secondly, performing a shale matrix-fracture structure and stress sensitivity test on the shale cores having different fracture network morphology. After that, determining a stress sensitivity constant of different fracture network morphology according to indoor core data and finally preparing an identification chart of the fracture network morphology based on an indoor core stress sensitivity text combined with a production practice. The identification chart can be applied to an actual fracturing well, and the fracture network morphology is directly identified by a real-time effective stress and a normalized flow.