About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
|
Symposium
|
Advancements in Steel Structural Refinement
|
Presentation Title |
High Cycle Fatigue Behavior of Nano-bainitic Steels: A Detailed Crack Initiation and Grain Boundary Study |
Author(s) |
Blessto B, Avanish Kumar, Aparna Singh |
On-Site Speaker (Planned) |
Blessto B |
Abstract Scope |
A range of refined nano-bainitic steels was developed by varying the austempering temperature (2500C, 3000C and 3500C). These steels' tensile and fatigue strength were investigated and linked to their microstructural features. Fractography showed that the fatigue failure has occurred primarily due to surface-induced crack initiations. The steel with the most cycles to failure has a greater tendency for transformation-induced plasticity. The plastic region transforms to martensite, which increases the fatigue life of steels in these conditions, thus delaying crack nucleation. The bainitic block width determined from EBSD analysis was correlated with the mechanical properties. The bainitic block boundary plays a predominant role as a microstructural barrier for fatigue crack growth. |