公开(公告)号：US20210270706A1

公开(公告)日：2021-09-02

申请号：US17260560

申请日：2018-08-30

Applicant: CENTRAL SOUTH UNIVERSITY

Inventor： Zuming LIU ,  Quan LI ,  Boyun HUANG ,  Xueqian LV ,  Kai PENG ,  Fan ZHAO

IPC: G01N1/36 ,  G01N1/28 ,  G01N23/203

Abstract: A preparation method for an iron-based alloy powder EBSD test sample includes the following steps: surface electrolytic activation of an iron-based powder; ultrasonically cleaning the powder, and drying the powder to obtain a surface activated powder; adding the surface activated powder to a chemical embedding solution for ultrasonic dispersion; after the ultrasonic dispersion, performing a plating process; then heating to 80-92° C. for chemical reaction to prepare an iron-based alloy bulk which coated with nickel. The plating process is as follows: still standing, stirring, and repeating the still standing is taken as a cycle, and at least one cycle is performed to complete the plating process. Then grinding and electropolishing are done to the obtained iron-based alloy bulk coated with nickel to obtain the iron-based alloy powder EBSD test sample.

公开(公告)号：US20240060156A1

公开(公告)日：2024-02-22

申请号：US18023731

申请日：2020-08-31

Applicant: CENTRAL SOUTH UNIVERSITY

Inventor： Zuming LIU ,  Bing WEI ,  Bizhong NONG ,  Xueqian LV ,  Yake REN ,  Bin CAO ,  Yongkang AI

IPC: C22C1/059 ,  C22C1/10 ,  C22C1/04 ,  C22C19/03 ,  B33Y10/00 ,  B22F10/28 ,  B22F10/85 ,  B33Y50/02 ,  B22F9/04 ,  B33Y40/10

CPC classification number: C22C1/059 ,  C22C1/1084 ,  C22C1/0433 ,  C22C19/03 ,  B33Y10/00 ,  B22F10/28 ,  B22F10/85 ,  B33Y50/02 ,  B22F9/04 ,  B33Y40/10 ,  B22F2999/00 ,  B22F2998/10 ,  B22F2304/10 ,  B22F2301/00 ,  B22F2201/10 ,  B22F2302/10 ,  B22F2009/043

Abstract: A method for preparing a nano-phase strengthened nickel-based superalloy using micron-scale ceramic particles is provided. In the method, a nickel-based superalloy is used as a matrix, and one or more of TiC, TiB2, WC and Al2O3 are used as a strengthening phase. A ceramic particle raw material used as the strengthening phase has a particle size of 1-5 μm and is added in an amount of 1-5 wt. %. A nickel-based superalloy composite powder having homogeneously distributed nano-scale ceramic is prepared by mechanical milling. A nano-scale ceramic phase strengthened nickel-based superalloy is prepared by 3D printing technology, which has a homogeneously distributed nano-scale ceramic phase and excellent mechanical properties.

公开(公告)号：US20240035123A1

公开(公告)日：2024-02-01

申请号：US18023733

申请日：2020-08-31

Applicant: CENTRAL SOUTH UNIVERSITY

Inventor： Zuming LIU ,  Xu ZHOU ,  Yake REN ,  Bizhong NONG ,  Sizhe LU ,  Bin CAO ,  Yongkang AI ,  Bing WEI ,  Xueqian LV

IPC: C22C21/16 ,  C22C21/14 ,  C22C1/02 ,  C22C1/03 ,  C22F1/057

CPC classification number: C22C21/16 ,  C22C21/14 ,  C22C1/026 ,  C22C1/03 ,  C22F1/057

Abstract: A high-strength Al-Cu-Mg-Mn aluminum alloy and a preparation method therefor is provided. The alloy includes the following components in percentage by weight: Si:≤0.5%, Fe: ≤0.5%, Cu: 4.5-6.3%, Mg: 0.6-1.2%, Mn: 0.6-1.5%, Sc: 0.15-0.35%, Zr: 0.1-0.2%, and Y: 0.1-0.3%, the balance being aluminum and non-removable impurities. The preparation method includes: smelting, refining, impurity removing and degassing, pouring, homogenizing heat treatment, three-dimensional large deformation forging pre-deformation, isothermal deformation processing, and heat treatment. A casting mold used is a special combined mold having a metal mold as an inner mold, a surrounding cooling pipe, and a sand mold as an outer mold, and is used to prepare and obtain high-quality, high-performance castings. The heat treatment is solid solution treatment plus gradient aging treatment. The Al-Cu-Mg-Mn aluminum alloy has a tensile strength higher than 520 MPa and an elongation of 12-16%, that is, an increased elongation rate and improved strength.

公开(公告)号：US20230151462A1

公开(公告)日：2023-05-18

申请号：US18155739

申请日：2023-01-18

Applicant: CENTRAL SOUTH UNIVERSITY

Inventor： Zuming LIU ,  Quan LI ,  Boyun HUANG ,  Xueqian LV ,  Kai PENG ,  Fan ZHAO

IPC: C22C32/00 ,  B22F9/04 ,  C22C38/22 ,  C22C38/28 ,  G01N23/04 ,  B22F1/052

CPC classification number: C22C32/0026 ,  B22F9/04 ,  C22C38/22 ,  C22C38/28 ,  G01N23/04 ,  B22F1/052 ,  B22F2009/043 ,  B22F2201/10 ,  B22F2301/35 ,  B22F2302/25

Abstract: A characterization method of an oxide dispersion-strengthened (ODS) iron-based alloy powder is provided. The characterization method comprises separating the strengthening phases from the powder matrix through electrolysis, and analyzing and characterizing the strengthening phases using an electron microscope.

公开(公告)号：US20210170487A1

公开(公告)日：2021-06-10

申请号：US17254303

申请日：2018-08-30

Applicant: CENTRAL SOUTH UNIVERSITY

Inventor： Zuming LIU ,  Kai PENG ,  Xueqian LV ,  Fan ZHAO ,  Quan LI ,  Bing WEI

IPC: B22F3/24 ,  B22F10/20

Abstract: The present disclosure relates to the field of additive manufacturing and superalloys, particularly to a method for eliminating cracks in René 104 nickel-based superalloy prepared by laser additive manufacturing. For solving the problem that cracks are easily generated during laser additive manufacturing of René 104 nickel-based superalloy with high content of Al and Ti (Al+Ti>5 wt. %), generation of large-size cracks inside a fabricated part is suppressed by means of designing laser forming parameters and a partition scanning strategy; then stress relief annealing is performed to completely eliminate residual stress inside the fabricated part; and a spark plasma sintering process is performed to eliminate cracks inside the fabricated part and suppress the growth of grains during the sintering process.

公开(公告)号：US20220111437A1

公开(公告)日：2022-04-14

申请号：US17533074

申请日：2021-11-22

Applicant: CENTRAL SOUTH UNIVERSITY

Inventor： Zuming LIU ,  Sizhe LU ,  Quan LI ,  Bing WEI ,  Xu ZHOU ,  Bizhong NONG ,  Yake REN ,  Yongkang AI ,  Bin CAO

IPC: B22F1/0545 ,  B22F1/065 ,  B22F1/142 ,  B22F1/145 ,  B22F9/04

Abstract: A method for preparing a nano spherical oxide dispersion strengthening phase using a micron oxide is proposed for the first time. First, a micron oxide is used as a raw material to prepare a nano oxide with a completely amorphous structure/matrix alloy composite powder by mechanical ball milling in stages. In the first stage, ball milling is performed, causing the oxide to break and transform in structure, and achieving nano-sizing and completely amorphization, to prepare a composite powder with a completely amorphous structure nano oxide uniformly distributed in the matrix alloy powder; and in the second stage, the composite powder obtained in the first stage and the remaining matrix alloy powder are uniformly mixed by ball milling. Then, the uniformly mixed powder is sequentially subjected to hot forming, hot rolling, and heat treatment, to obtain a nano spherical oxide dispersion strengthened alloy.

公开(公告)号：US20210147965A1

公开(公告)日：2021-05-20

申请号：US17263559

申请日：2018-08-30

Applicant: CENTRAL SOUTH UNIVERSITY

Inventor： Zuming LIU ,  Quan LI ,  Boyun HUANG ,  Xueqian LV ,  Kai PENG ,  Fan ZHAO

IPC: C22C32/00 ,  C22C38/22 ,  C22C38/28 ,  B22F9/04 ,  B22F1/00 ,  G01N23/04

Abstract: An oxide dispersion-strengthened (ODS) iron-based alloy powder and a characterization method thereof are provided. The alloy powder comprises a matrix and strengthening phases. The strengthening phases include at least two types of strengthening phase particles with different sizes, wherein a volume of the particles with a particle size of less than or equal to 50 nm accounts for 85-95% of a total volume of all the strengthening phase particles. The matrix is a Fe—Cr—W—Ti alloy. The characterization method of the ODS iron-based alloy powder comprises separating the strengthening phases from the powder matrix through electrolysis, and analyzing and characterizing the strengthening phases using an electron microscope.

公开(公告)号：US20180056398A1

公开(公告)日：2018-03-01

申请号：US15556619

申请日：2016-03-08

Applicant: CENTRAL SOUTH UNIVERSITY

Inventor： Zuming LIU ,  Pengfei SU ,  Boyun HUANG ,  Qinglong DUAN ,  Mengmei MA ,  Yang GUO ,  Shiqi CHEN

IPC: B22F9/04 ,  B02C17/20 ,  B02C25/00

CPC classification number: B22F9/04 ,  B02C17/20 ,  B02C25/00 ,  B22F2009/043 ,  B22F2998/10 ,  B22F2999/00 ,  C22C1/0433 ,  C22C19/056 ,  B22F9/082 ,  B22F2201/10

Abstract: The invention relates to a method for eliminating hollow defects in atomized superalloy powder, and pertains to the field of powder metallurgy materials. A ball-milling processing is conducted on the atomized alloy powder to eliminate the hollow defect, obtain solid powder and increase powder utilization efficiency. By controlling mill ball diameters, mass ratio of mill balls with different diameters, mass ratio of ball to powder and ball milling time, a multi-directional impact on the powder is achieved, thereby control powder shape and obtain solid spherical powder. The invention eliminates powder hollow defect by using ball milling process and equipment. This invention with high powder utilization efficiency, short ball milling time and simple operating process, can be used for large-scale preparation and application.

公开(公告)号：US20220062995A1

公开(公告)日：2022-03-03

申请号：US17490355

申请日：2021-09-30

Applicant: CENTRAL SOUTH UNIVERSITY

Inventor： Zuming LIU ,  Bizhong NONG ,  Bing WEI ,  Yake REN ,  Xu ZHOU ,  Sizhe LU ,  Bin CAO ,  Yongkang AI

IPC: B22F10/28 ,  C22C19/05 ,  B33Y10/00 ,  B33Y70/00 ,  B22F10/368 ,  B23K26/342 ,  B23K26/32

Abstract: A method for preventing cracking of nickel-based superalloy fabricated by selective laser melting (SLM) belongs to the field of additive manufacturing (AM). The method of preparing an as-built part with a high density, no crack defects, and good mechanical properties includes: reducing the content of elements Zr and B forming low melting point phase in a nickel-based superalloy, adjusting the total content of Al and Ti in the alloy to 4.5 wt % or below, and combining with the control of special SLM process parameters. The new method has the advantages of a reasonable component design, a simple preparation process, and good performance of the as-built part, and therefore is suitable for large-scale application.

公开(公告)号：US20220062992A1

公开(公告)日：2022-03-03

申请号：US17496809

申请日：2021-10-08

Applicant: CENTRAL SOUTH UNIVERSITY

Inventor： Zuming LIU ,  Bing WEI ,  Bizhong NONG ,  Xueqian LV ,  Yake REN ,  Bin CAO ,  Yongkang AI

IPC: B22F9/08 ,  B33Y40/10 ,  B33Y70/00 ,  C22C30/00

Abstract: A nickel-based superalloy for three-dimension (3D) printing and a powder preparation method thereof are provided. The method of preparing the nickel-based superalloy and its powder includes: RE microalloying combined with vacuum melting, degassing, refining, atomization with reasonable parameters, and a sieving process. The new method significantly reduces the cracking sensitivity of the “non-weldable” PM nickel-based superalloys, and broadens the 3D printing process window. The as-printed part has no cracks, and good mechanical properties. In addition, the powder prepared by the new method has higher sphericity and better flowability, and less irregular powders. The yield of fine powders with a particle size of 15-53 μm and medium-sized powders with a particle size of 53-106 μm that are required for 3D printing is greatly improved, which meet the requirements for 3D printing of high-quality, low-cost nickel-based superalloy powder.