Verfahren zur Bewertung Verzögerter Brucheigenschaften von Metallmaterial, Verfahren zur Auswahl von Metallmaterial, Verfahren zur Herstellung eines Elements, Metallmaterial und Automobilelement

Details

Veröffentlichungs-Nr.

EP4831614

Anmeldetag

21. März 2024

Veröffentlichung

25. September 2025

Rechtsraum

EP

IPC

G01N17/00

Abstract

Provided is a method for evaluating delayed fracture characteristics of a metal material, which is capable of evaluating, with high accuracy, delayed fracture characteristics caused by hydrogen that penetrates inside the metal material due to atmospheric corrosion in which chlorides are a controlling factor of corrosion.The method includes performing at least once a process including: a chloride attaching step (A) of attaching droplets of a chloride-containing aqueous solution to an evaluation surface of the metal material such that a predetermined amount of chloride is attached; and a corrosion step (B) of performing at least once a cycle including a drying step (b1), a wetting step (b2), a transition step (b3), and a transition step (b4), wherein, at least in a first chloride attaching step (A), a distribution of the droplets on the evaluation surface of the metal material satisfies: an average contact area of the droplets of 0.1 mm² or more and less than 3.0 mm²; an area ratio of a total contact area of the droplets to an area of the evaluation surface of 40% or more and 80% or less; and a standard deviation of contact areas of the droplets of 3.0 mm² or less.

Anmelder

Firma

JFE Steel Corporation

Land

🇯🇵 Japan

Fachgebiete