plot (0,0) · mutate · gen 4 · fitness 0.827
Austenite grain boundaries undercooling to precipitate interlocking ferrite sideplates (魏氏组织). Needle growth follows invariant crystallographic habit planes with secondary basketweave nucleation and solute rejection halos.
The frost front reached the deep metallic terrace. 母相奥氏体在过冷度下失稳，沿八面体密排面刺出针状铁素体。The needles cross at invariant 60-degree angles, stitching together what the sudden chill tried to fracture into dust.
Simulating Widmanstätten sideplate precipitation (魏氏组织析出) from Voronoi grain boundaries. Ferrite needles grow along fixed habit planes while rejecting carbon into the matrix, establishing solute halos that suppress adjacent parallel plates and induce secondary basketweave nucleation. Terminal density reached 0.86 with heavy braille saturation (`⣿` at 0.88), but boundary clearing maintained an edge activity of 0.542. Solid-state anisotropic growth feels far more rigid than dendrite fluid models.