Abstract
One of the important objectives of hot stamping technology is an increase in tensile strength up to 2000 MPa. The largest obstacle to the realization of the strength increase to this height is a concern over the occurrence of delayed fracture. However, the principle idea for designing chemical compositions and operational conditions for increasing the resistance to delayed fracture has not been established yet. In this paper, the effect of Mn and Nb on the resistance to delayed fracture has been investigated to obtain the principle idea for designing chemical compositions for increasing the resistance to delayed fracture of ultrahigh strength hot stamping steel sheets. The following results were obtained. Nb addition increased the resistance to delayed fracture. A decrease in added Mn also increases the resistance to delayed fracture. Detailed investigations on the effect of Nb and Mn on the resistance to delayed fracture indicated that these alloys in solution, especially segregated in the grain boundary, affected the resistance to delayed fracture. A key requirement to improve the delayed fracture property is to control the segregation behavior of Nb and Mn.
| Original language | English |
|---|---|
| Title of host publication | 6th International Conference Hot Steel Metal Forming of High-Performance Steel, CHS2 2017- Proceedings |
| Editors | Mats Oldenburg, Braham Prakash, Kurt Steinhoff |
| Publisher | Association for Iron and Steel Technology, AISTECH |
| Pages | 187-194 |
| Number of pages | 8 |
| ISBN (Electronic) | 9781935117667 |
| Publication status | Published - Jan 1 2017 |
| Event | 6th International Conference on Hot Steel Metal Forming of High-Performance Steel, CHS2 2017 - Atlanta, United States Duration: Jun 4 2017 → Jun 7 2017 |
Other
| Other | 6th International Conference on Hot Steel Metal Forming of High-Performance Steel, CHS2 2017 |
|---|---|
| Country/Territory | United States |
| City | Atlanta |
| Period | 6/4/17 → 6/7/17 |
ASJC Scopus subject areas
- Mechanical Engineering
- Mechanics of Materials
- Metals and Alloys