That glowing billet isn’t just being squeezed — its crystal structure is actively reorganizing. When steel is heated above ~1000°C, it enters the austenitic phase (a high-temperature crystal structure of iron). In this state, atoms have enough energy to rearrange more freely. Now add compressive force from a hydraulic press. You trigger dynamic recrystallization. Instead of growing weak, elongated grains (which happen during cold deformation), new strain-free grains nucleate and replace the distorted ones during deformation. This process: • Refines grain size • Reduces internal defects (dislocations) • Improves toughness • Enhances fatigue resistance • Increases impact strength Smaller grains = more grain boundaries. More grain boundaries = barriers to crack propagation. That’s why forged components often outperform cast ones in high-stress environments. This is materials engineering in real time: Thermodynamics + kinetics + mechanical work. And those orange sparks? That’s oxid...