鋼材中の非金属介在物とその周囲母相間の界面状態を評価する方法

Japanese Patent JP7418917

B2

To provide a method of evaluating a size of a relatively large non-metallic inclusion that frequently exists in steel and an interface status between the non-metallic inclusion and its surrounding matrix quickly, at low-cost and accurately.SOLUTION: A method includes steps of: taking a test piece having a dangerous volume of 400 mm3 or more from steel for evaluation; after charging the test piece with hydrogen, applying a stress by ultrasonic vibration to the test piece to break it; identifying the largest non-metallic inclusion that appeared near a fracture origin on a fracture surface of the test piece; measuring the size of the inclusion; identifying a falling trace of the largest inclusion on a fracture surface on the opposing side of the fracture surface; measuring a projection shape of the non-metal inclusion on one of the specified fracture surface pair; measuring a recess shape on the falling trace side of the non-metal inclusion remaining on the other fracture surface; using a difference detected by collating the size of the largest non-metal inclusion, the projection shape and the recess shape; and evaluating the size of the non-metal inclusion in steel and an interface status between the inclusion and the surrounding matrix.SELECTED DRAWING: Figure 6

Ryota Manabe
Hayabusa Sugimoto
Takeshi Fujimatsu

JP2020028881A

January 22, 2024

February 22, 2020

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Sanyo Special Steel Co., Ltd.

G01N33/2022; G01N3/32; G01N17/00

JP2012073059A
JP2010217076A
JP2004045363A
JP2008196616A

US20120024077

Hironori Yokoi
Satoshi Yokoi

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