公开(公告)号：US20230243015A1

公开(公告)日：2023-08-03

申请号：US18098226

申请日：2023-01-18

Applicant: SINTOKOGIO, LTD.

Inventor： Yuta SAITO ,  Yuji KOBAYASHI

IPC: C21D10/00 ,  C21D7/04

CPC classification number: C21D10/005 ,  C21D7/04 ,  C21D2211/001 ,  C21D2241/01

Abstract: A method for processing corrosion resistant austenitic stainless steel includes: preparing a workpiece made of austenitic stainless steel; and applying compressive residual stress to a surface layer of the workpiece without subjecting the surface layer to plastic working.

公开(公告)号：US20230160843A1

公开(公告)日：2023-05-25

申请号：US17441049

申请日：2019-12-13

Applicant: SINTOKOGIO, LTD.

Inventor： Yuji KOBAYASHI ,  Akinori MATSUI ,  Yuta SAITO

IPC: G01N23/20008 ,  G01N1/44

CPC classification number: G01N23/20008 ,  G01N1/44 ,  G01N2223/607 ,  G01N2223/3037

Abstract: A metal material other than strain-free iron powder can be used as a reference piece for X-ray measurement of residual stress. The metal material is manufactured by nanocrystallizing at least a portion of a surface of a metal material, and then removing inherent strain by annealing the metal material, thereby eliminating stress.

公开(公告)号：US20220411910A1

公开(公告)日：2022-12-29

申请号：US17848519

申请日：2022-06-24

Applicant: SINTOKOGIO, LTD.

Inventor： Yuta SAITO ,  Kan AOKI

IPC: C22F1/04

Abstract: A method of manufacturing a stress reference piece includes the following steps (1) to (3):
(1) preparing an aluminum alloy member containing an element that generates a β phase; (2) performing a shot peening treatment on the aluminum alloy member; and (3) performing a tempering treatment on the aluminum alloy member after the shot peening treatment, the tempering treatment accelerating generation of the β phase.

公开(公告)号：US20230405723A1

公开(公告)日：2023-12-21

申请号：US18197759

申请日：2023-05-16

Applicant: SINTOKOGIO, LTD.

Inventor： Yuta SAITO ,  Yuji KOBAYASHI

IPC: B23K26/356 ,  B23K26/00 ,  B23K26/073

CPC classification number: B23K26/356 ,  B23K26/0732 ,  B23K26/0006

Abstract: A method for machining a tool includes applying compressive residual stress to the tool by laser peening using a pulsed laser. The tool includes a base material and a coating layer that covers at least a portion of a surface of the base material. In the applying, the compressive residual stress is applied to the tool such that a difference in compressive residual stress at an interface between the base material and the coating layer is at most 100 MPa.

公开(公告)号：US20230226642A1

公开(公告)日：2023-07-20

申请号：US18008506

申请日：2021-06-24

Applicant: SINTOKOGIO, LTD.

Inventor： Fumiaki KUMENO ,  Toshiya TSUJI ,  Yuta SAITO

IPC: B23K26/356 ,  B21D31/06

CPC classification number: B23K26/356 ,  B21D31/06

Abstract: A surface treatment method includes: a first step of applying a plane wave-shaped shock wave to a workpiece to cause high-density transition to occur in a material structure of the workpiece; and a second step of applying a spherical wave-shaped shock wave or a pressure due to physical contact to the workpiece after the first step for plastic deformation of the workpiece.