| About this Abstract |
| Meeting |
Materials Science & Technology 2011
|
| Symposium
|
MS&T'11 Poster Session
|
| Presentation Title |
136 Effect of Prestrain and Bake Hardening Heat Treatment on Fracture Toughness and Fatigue Crack Growth Resistance of Two Dual-Phase Steels |
| Author(s) |
Leonardo Barbosa Godefroid, Warley Silva Horta, Fabiano Alcantara Machado, Margareth Spangler Andrade |
| On-Site Speaker (Planned) |
Leonardo Barbosa Godefroid |
| Abstract Scope |
Fracture toughness (J integral, R-curve) and fatigue crack growth (da/dN) resistance have been studied in two ferrite-martensite DP-600MPa steels broadly used in the automotive industry, with 7% to 12% of martensite volume fraction, and with different silicon and chromium additions. The effect of 10% prestrain followed by a bake hardening heat treatment was verified. This thermo-mechanical treatment was used to simulate the stamping and the paint baking of the wheels. All the mechanical properties are affected by the thermo-mechanical history for both steels. An inverse relationship was found between yield stress and J integral, and between yield stress and fatigue threshold. This behavior was related with small changes in the microstructure of the steels. |
| Proceedings Inclusion? |
Undecided |