Microstructural characterization and softening analysis of the friction stir welding rolled homogenous armor steel
- Guzman J. ,
- Riffel K. ,
- McDonell M. ,
- et al
- Guzman J. ,
- Riffel K. ,
- McDonell M. ,
- Repp O. ,
- Rogers M. ,
- Eff M. and
- Ramirez A.
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Rolled homogeneous armor (RHA) steel is widely utilized in the armor industry due to its cost-effectiveness and outstanding ballistic performance against various battlefield threats. As the industry pursues lightweight solutions and addresses softening issues, particularly in the head-affected zone (HAZ), friction stir welding (FSW) has emerged as a promising approach. In this research, FSW bead-on plates were created using controlled force on 6.35 mm thick RHA steel to determine optimal welding parameters and analyze HAZ softening. Following fabrication, we conducted microstructural analysis on the resultant beads. Additionally, we quantified the extent of HAZ softening through microscopy techniques and hardness mappings. The outcomes demonstrated the successful formation of flawless beads with good tool engagement. Furthermore, the HAZ softening in the RHA steel exhibited significant variations across the bead, attributed to the formation of bainite and tempering during the welding process. This was evidenced by using scanning electron microscopy (SEM) and EBSD parent grain reconstruction images.
13th International Symposium, 21-23 May 2024, Session 7: Steel II, Paper 02
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