| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Advancements in Steel Structural Refinement
|
| Presentation Title |
On the Limits of Strength and Performance in Automotive Sheet Steels |
| Author(s) |
Hardy Mohrbacher |
| On-Site Speaker (Planned) |
Hardy Mohrbacher |
| Abstract Scope |
The ideal car body steel for light weighting of structural components combines high strength with sufficient manufacturability and optimum service performance. Principally, ferrite and martensite define the limiting microstructures. In this context it is interesting to reflect on the absolute strength limits of ferrite and martensite. The stress-strain curve obtained by uniaxial tensile testing is governed by ductile failure and cannot give a definite answer to this question. Under the condition of highly localized deformation in steel of very high yield strength, ductile failure is in competition with brittle failure even if the macroscopic behavior would still appear ductile. Material characteristics of relevance are fracture strain and fracture toughness. In this context, the relevant strengthening mechanisms and their limitations will be discussed. This allows also estimating the limitations of forming relevant properties based on work hardening, fracture strain and bendability. Respective maps relating strength to these properties will be presented. |