公开(公告)号：US12186803B2

公开(公告)日：2025-01-07

申请号：US17685824

申请日：2022-03-03

Applicant: Northwestern Polytechnical University

Inventor： Haijun Su ,  Yong Zhao ,  Meng Wang ,  Jun Zhang ,  Min Guo ,  Lin Liu ,  Hengzhi Fu

IPC: B22F1/05 ,  B22F1/142 ,  B22F3/10 ,  B22F3/105 ,  B22F9/04 ,  C22C19/05

Abstract: Disclosed are a nickel-based superalloy formed by selective laser melting and a preparation method thereof. In the method, CrFeNb alloy powder is used as a grain refiner, and its element composition is within the composition range of a nickel-based superalloy powder to ensure that the prepared nickel-based superalloy has the same element composition with the original alloy; the grain size in the nickel-based superalloy could be refined by the addition of CrFeNb alloy powder, such that the anisotropic columnar grain structure in the alloy is transformed to equiaxed grain structure, thereby improving mechanical properties of the alloy.

公开(公告)号：US20250146113A1

公开(公告)日：2025-05-08

申请号：US18621532

申请日：2024-03-29

Applicant: Northwestern Polytechnical University

Inventor： Min Guo ,  Jia Chen ,  Jun Zhang ,  Min Yang ,  Yong Zhao

IPC: C22F1/10 ,  G01N27/411

Abstract: The present disclosure discloses a method and system for designing a solution heat-treatment process of a single-crystal superalloy, and relates to the field of numerical simulation-material processing crossover techniques. The method includes: determining a solidus temperature distribution of an as-cast single-crystal superalloy sample based on a relationship between an element concentration and a solidus temperature according to an element concentration distribution extracted from the as-cast single-crystal superalloy sample; subjecting the as-cast single-crystal superalloy sample to solution heat-treatment simulation by a phase-field method to obtain a post-treatment element concentration distribution after a simulation time step of heat preservation at an incipient melting temperature; determining a segregation coefficient of each element; when segregation coefficients of all elements are within a preset range, denoting all incipient melting temperatures and corresponding current simulation times as solution heat-treatment simulation results; and determining an actual solution heat-treatment process of the as-cast single-crystal superalloy sample.

公开(公告)号：US11753695B2

公开(公告)日：2023-09-12

申请号：US17360409

申请日：2021-06-28

Applicant: Northwestern Polytechnical University

Inventor： Taiwen Huang ,  Lin Liu ,  Min Guo ,  Haijun Su ,  Jun Zhang ,  Wenchao Yang ,  Zheliang Liu ,  Yinuo Guo ,  Huating Chang ,  Hui Shen ,  Shaoying Li

IPC: C21D11/00 ,  C21D1/773 ,  C21D9/00 ,  C21D9/52

CPC classification number: C21D11/00 ,  C21D1/773 ,  C21D9/0075 ,  C21D9/525

Abstract: A device and a method for continuous temperature gradient heat treatment of a rod-shaped material are disclosed. The furnace body of the device includes an upper heating zone and a lower heating zone inside, which are independently controlled in temperature by means of an upper heating power supply and a lower heating power supply. Moreover, both the upper heating zone and the lower heating zone are closed heating zones. The closed heat insulation plates could prevent heat loss and ensure precise temperature control of the upper heating zone and the lower heating zone. In the device, a vacuum pumping equipment is included; an annular radiation screen is configured between the upper heating zone and the lower heating zone, and the rod-shaped material is not in contact with the annular radiation screen The rod-shaped material conducts one-dimensional heat transfer along the axial direction.