Effect of Twice Quenching on Prior Austenite Grains and Rotating Bending Fatigue Cracks in SUJ2 Steel

Koshiro Mizobe; Wakana Matsuda; Masayuki Matsushita; Takuya Shibukawa; Katsuyuki Kida

doi:10.4028/www.scientific.net/AMM.620.443

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 620Effect of Twice Quenching on Prior Austenite...

Effect of Twice Quenching on Prior Austenite Grains and Rotating Bending Fatigue Cracks in SUJ2 Steel

Abstract:

Martensitic high-carbon high-strength SUJ2 bearing steel has been widely used as a main alloy for rolling contact applications, and also in components under bending and tension-compression. In order to enhance the material’s strength, refining the prior austenite grain size through repeated-heating was investigated in our previous work. In this work, we observed the microstructure of twice quenched N-rich SUJ2 steel and performed their rotating bending fatigue tests. It was found that most of cracks on the fracture surface originated from Al₂O₃ inclusions.

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Periodical:

Applied Mechanics and Materials (Volume 620)

Pages:

443-448

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.620.443

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Online since:

August 2014

Authors:

Koshiro Mizobe, Wakana Matsuda, Masayuki Matsushita, Takuya Shibukawa, Katsuyuki Kida*

Keywords:

Al₂O₃, Grain Refinement, Non-Metallic Inclusion, Repeated Heating, SUJ2, TiN

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