Development of Fracture Surface Etching (FSE) Method around Non-Metallic Inclusion of SUJ2 Steel

Kenya Tsuji; Koshiro Mizobe; Katsuyuki Kida

doi:10.4028/www.scientific.net/MSF.971.65

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HomeMaterials Science ForumMaterials Science Forum Vol. 971Development of Fracture Surface Etching (FSE)...

Development of Fracture Surface Etching (FSE) Method around Non-Metallic Inclusion of SUJ2 Steel

Abstract:

High-carbon high-strength JIS-SUJ2 bearing steel is one of the alloys used as rolling contact applications which need high wear resistance. This high hardness material is broken from non-metallic inclusions under fatigue stress. In this work, we developed a new observation method “fracture surface etching (FSE)” in order to observe the material microstructure on the fracture surface. We succeeded to draw clear grain boundaries on the fracture surfaces and closely observed the material microstructure around the crack origins by the FSE method. We concluded that the crack initiation area boundary is not formed by only the grain boundary, and the grain size around the Al2O3 inclusion on the fracture surface was similar to that of the flat surface which does not have inclusions before fatigue testing.

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Periodical:

Materials Science Forum (Volume 971)

Pages:

65-69

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.971.65

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Online since:

September 2019

Authors:

Kenya Tsuji, Koshiro Mizobe*, Katsuyuki Kida

Keywords:

Al₂O₃ Inclusion, Bearing Steel SUJ2, Etching, Fatigue, Fracture Surface, Grain Size, Prior Austenite Grain, Quenching, Tempering

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