Abstract
In this study, voids formation behavior was investigated quantitatively in high tensile strength steel sheets containing cementite. Tensile tests of rectangular specimen were performed in longitudinal direction, and after the tensile tests, the fractured specimens were observed by SEM in the center position of longitudinal cross section. Voids were observed in five thickness reduction areas with different strain level. As a result, number density of voids increased as strain increased. Mainly, two types of voids were seen here. One was the decohesion at the boundaries between bainitic ferrite and cementite, and the other was cracking of cementite itself. Misorientation in the crystal grains was determined by KAM (Kernel Average Misorientation) using EBSD analysis. The obtained KAM values increased as strain increased, especially in the boundaries between bainitic ferrite and cementite. Therefore, it was revealed quantitatively that voids formed mainly through local strain increase in the boundaries between bainitic ferrite and cementite.
| Original language | English |
|---|---|
| Title of host publication | Materials Science and Technology Conference and Exhibition 2016, MS and T 2016 |
| Publisher | Association for Iron and Steel Technology, AISTECH |
| Pages | 573-577 |
| Number of pages | 5 |
| Volume | 1 |
| ISBN (Electronic) | 9781510833142 |
| Publication status | Published - 2016 |
| Event | Materials Science and Technology Conference and Exhibition 2016, MS and T 2016 - Salt Lake City, United States Duration: 2016 Oct 23 → 2016 Oct 27 |
Other
| Other | Materials Science and Technology Conference and Exhibition 2016, MS and T 2016 |
|---|---|
| Country/Territory | United States |
| City | Salt Lake City |
| Period | 16/10/23 → 16/10/27 |
Keywords
- Cementite
- Ductile fracture
- EBSD
- High tensile strength steel sheet
- KAM
- Void
ASJC Scopus subject areas
- Materials Science (miscellaneous)
- Mechanics of Materials
- Energy Engineering and Power Technology