| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Advancements in Steel Structural Refinement
|
| Presentation Title |
Strengthening Effects of Fine MX Precipitates and Solute Clustering on Seismic/Fire Simulated Fatigue Test in Bainitic H-Section Steel |
| Author(s) |
Jae-Yeon Han, Cheol-Hyeok Yang, Bong-Ho Lee, Chang-Hoon Lee, Jun-Ho Chung, Hyun-Uk Hong |
| On-Site Speaker (Planned) |
Jae-Yeon Han |
| Abstract Scope |
In this study, we developed a low carbon bainitic H-section steel, alloyed with Mo, V, Ti, and Nb, optimized for seismic and fire resistance. This steel maintained high structural integrity, demonstrating a yield ratio of 0.7 and sustaining 74% of its room temperature yield strength at 600°C. We tested its durability through low-cycle fatigue (LCF) tests at room temperature for 10 cycles to mimic earthquake conditions, followed by a 2-hour thermal exposure at 600°C to simulate post-earthquake fire scenarios. To evaluate the steel's reusability and maintenance after subsequent earthquakes, additional LCF testing at room temperature was conducted, which showed that fatigue life was comparable to non-thermally exposed specimens. Microstructural analyses revealed that fatigue resistance is primarily enhanced by mutual strengthening from fine additional MX precipitation and solute clustering, along with segregation on dislocations, effectively suppressing cyclic softening and leading to excellent complex LCF resistance. |