Title:
METHOD FOR ASSESSING DELAYED FRACTURE CHARACTERISTICS OF SHEARED END SURFACES, PROGRAM, AND METHOD FOR PRODUCING AUTOMOTIVE COMPONENTS
Document Type and Number:
WIPO Patent Application WO/2023/229004
Kind Code:
A1
Abstract:
A more accurate assessment of the delayed fracture characteristics of a sheared end surface is made possible. This method for assessing delayed fracture characteristics assesses the delayed fracture characteristics of a sheared end surface of a metal sheet and comprises: a test comprising a step for restraining in a condition in which a predetermined load stress is applied to the sheared surface of the metal sheet, and a step for placing the metal sheet, while in this restrained condition, for a predetermined period of time in a predetermined hydrogen penetration environment; and a step for determining, on the basis of the results of this test, a critical load stress that is the load stress at the limit where delayed fracture of the sheared surface of the metal sheet is not produced; and establishing, on the basis of the thereby determined critical load stress, a stress margin with respect to the production of delayed fracture of the sheared end surface of the metal sheet. The thusly determined stress margin is used as an index for assessing the delayed fracture characteristics of the sheared end surface of the metal sheet.
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Inventors:
MATSUKI YUICHI (JP)
SHINMIYA TOYOHISA (JP)
NAKAGAWA KINYA (JP)
YAMASAKI YUJI (JP)
SHINMIYA TOYOHISA (JP)
NAKAGAWA KINYA (JP)
YAMASAKI YUJI (JP)
Application Number:
PCT/JP2023/019488
Publication Date:
November 30, 2023
Filing Date:
May 25, 2023
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
G01N3/20; G01N3/08; G01N17/00
Foreign References:
| JP7004126B1 | 2022-01-21 | |||
| JP2022024814A | 2022-02-09 | |||
| JP2022014784A | 2022-01-20 | |||
| JP2010107297A | 2010-05-13 |
Attorney, Agent or Firm:
TANAKA Hidetetsu et al. (JP)
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