About this Abstract |
Meeting |
MS&T24: Materials Science & Technology
|
Symposium
|
16th Symposium on Green and Sustainable Technologies for Materials Manufacturing and Processing
|
Presentation Title |
Fatigue Performance of Laser Welded TWIP1000 Steel |
Author(s) |
Mei Zhang, Wenhao LI, Weikun Wang |
On-Site Speaker (Planned) |
Mei Zhang |
Abstract Scope |
The microstructure and mechanical properties of laser welded twinning-induced plasticity (TWIP) steel were investigated. The results indicate that the laser welded joint shows fully coarse dendrite austenite microstructure in fusion zone with slightly reduced Mn content, the heat-affected zone consists of both softened and hardened zones. The tensile strength(TS) and elongation were 900MPa and 33% respectively, 90% and 50% of those of the base material. The fatigue fractures are all concentrated in the weld due to the stress concentration. The high-cycle fatigue limit of the specimen is 434.4 MPa, 48.2% of TS. The cyclic softening of fatigue test piece is followed by cyclic hardening in the low-cycle fatigue process. The cyclic hardening rate (HR) increases as the strain amplitude increase, except the strain amplitude 0.25% condition. The cyclic softening rate (SR) reaches the peak value at the strain amplitude 0.4%. |