About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Advances in Understanding of Martensite in Steels III
|
| Presentation Title |
Effects of manganese sulfide morphology on bending fracture mechanism of martensitic steel |
| Author(s) |
Tatsuya Otsuki, Yoshinobu Yasuoka, Yuma Asada, Shingo Fujinaka, Takashi Yasutomi, Shunji Hiwatashi |
| On-Site Speaker (Planned) |
Tatsuya Otsuki |
| Abstract Scope |
The effects of MnS morphology on the bending fracture mechanism of high-strength martensitic steel were investigated. As the aspect ratio of MnS increased, with the major axis aligned to the bending ridge direction, the maximum bending angle decreased. Delaminations of MnS were observed before reaching the maximum load point, but little differences in loads were observed. Fracture surfaces consisted of two parts; shear fracture around specimen surface and voids caused by MnS delamination. Microcracks were present on the specimen surface, and shear bands formed under these microcracks until reaching the maximum load. With the higher aspect ratio of MnS, the number of microcracks increased, and the shear bands developed further. It is inferred that, in martensitic steel containing MnS, the larger aspect ratio of MnS promotes the development of shear bands from the surface, leading to crack formation and reduces bendability. |