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Elias leaned into the eyepieces. He didn’t see metal; he saw a map of a catastrophe. The grains were elongated, screaming of stress that the bridge was never meant to handle. There, at the edge of a crystal boundary, was a microscopic inclusion—a tiny "impurity" that had acted like a wedge, splitting the steel from the inside out.

Metallography: Principles and Practice by George F. Vander Voort metallography principles and practice vandervoort pdf top