Observation of Transition Area Origin Cracks on Fracture Surfaces of Carburized JIS SCM415 Bars

Yuki Nakasone; Takahiro Matsueda; Kei Ushizima; Koshiro Mizobe; Katsuyuki Kida

doi:10.4028/p-k19oa1

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HomeMaterials Science ForumMaterials Science Forum Vol. 1084Observation of Transition Area Origin Cracks on...

Observation of Transition Area Origin Cracks on Fracture Surfaces of Carburized JIS SCM415 Bars

Abstract:

Under high cycle and very high cycle fatigue, high strength steels break as a result of internal fracture from inclusions. In order to understand this fracture, “Fisheye” crack has been investigated. In our previous work we found that cracks grew from the boundary between the hard surface and soft core of case-hardened S45C, SUJ2 and SCM415 steel bars under rotating bending fatigue. These cracks were called “Transition area origin (TRO)” cracks. In this study, we closely observed the fracture surface of TRO crack areas in carburized JIS SCM415 specimens (under 734, 776 and 865 MPa). We found three features of the TRO cracks: outside of the TRO cracks had asperities; the shapes of TRO cracks were almost circular, and were different from those in S45C and SUJ2 steels; and the HAZ-TRO area which was located at hardened layer had some ridges, and the Core-TRO area at unheat-treated layer was smooth and flat.

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Periodical:

Materials Science Forum (Volume 1084)

Pages:

105-110

DOI:

https://doi.org/10.4028/p-k19oa1

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Online since:

April 2023

Authors:

Yuki Nakasone*, Takahiro Matsueda, Kei Ushizima, Koshiro Mizobe, Katsuyuki Kida

Keywords:

Carburizing, Fractography, Fracture Surface, SCM415 steel, Transition Area Origin Crack

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