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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.

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Effect of Nb Microalloying on the HAZ Grain Growth Kinetics and Precipitation Dissolution during Welding
F-2: Study on Strength and Toughness Matching of 1000 MPa Ultra-high Strength Steel
High Cycle Fatigue Behavior of Nano-bainitic Steels: A Detailed Crack Initiation and Grain Boundary Study
In-situ Measurement of Surface Relief Effect during Displacive Transformation of Low-carbon Steel
Intercritical Annealing of HY Steel to Improve Impact Toughness
Phase Transformation Behavior of Fe-10wt.% Ni Steel Weld Metal
The Effect of Adding Minor Alloying Elements in Reducing the Prior Austenite Grain Size in High Yield Strength (HY) Steels

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