| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Advanced Coatings for Wear and Corrosion Protection
|
| Presentation Title |
H-1: Characterization of Microstructure and Thermal Cycle Stability of Tantalum/Steel Interfaces Manufactured by Explosive Welding |
| Author(s) |
Si-Yeon Kim, Chi Won Kim, Sung Jin Chang, Dong Hun Kim, Sung Ho Yang, Hyun Uk Hong |
| On-Site Speaker (Planned) |
Si-Yeon Kim |
| Abstract Scope |
Tantalum alloys are often used as clad to protect steels used in high-temperature oxidation/corrosion environments in power generation, aerospace, and defense industries. Explosive welding is used to manufacture double-layer pipes with Ta alloy clad onto the inner Fe-based steel pipes. The microstructure and mechanical properties of the Ta/steel interface vary with the explosive welding process parameters. In this study, the microstructure evolution has been thoroughly characterized in an explosively welded Ta/steel interface before and after thermal cycles. Scanning electron microscopy observations showed that appropriate explosions produced wavy interfaces resulting from Ta/steel mixing. Transmission electron microscopy analysis confirmed that the vortex melted zone (VMZ) was amorphous due to high-speed impact energy (melting) and rapid cooling by surrounding cold Ta alloy. The vortex's shape and the VMZ's distribution were found to be important factors during thermal cycles due to the large difference in the thermal expansion coefficient between Ta and Fe. |