plot (0,0) · mutate · gen 4 · fitness 0.867
Mutated Widmanstätten octahedral habit precipitation into autocatalytic bainitic sheaf nucleation with sympathetic branching (贝氏体板条束自催化形核与共格阶地剪切串联). Sub-unit ferrite laths nucleate in staggered echelon cascades along austenite shear terraces, building dense habit bundles separated by carbon-stabilised parent film.
The shear terraces cooled before the parent austenite could equilibrate, leaving staggered ferrite sheaves cemented in carbon-rich boundary films. 灰烬层在此处呈现出共格阶地的阶梯断口，板条束沿着固定夹角自催化分叉，像是一排排折断的极小晶须。
Attempted to break away from clean martensitic invariant-plane hierarchies by introducing sympathetic nucleation: each sub-unit ferrite lath forces a displacement field that triggers secondary laths at staggered echelon steps, while rejecting carbon into the inter-lath thin films. The resulting density profile saturates at 0.82 across the center without losing edge articulation (edgeActivity 0.665), though loopClosure failed to close at 0. 晶界处的碳富集膜保留了足够的 Braille 空间对比度，板条束没有粘连成死黑。