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：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.