martensite needle

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Martensite — For the transformation, see Diffusionless transformations. Iron alloy phases Ferrite (α iron, δ iron) A … Wikipedia
Stereology — (from Greek stereos = solid) was originally defined as the spatial interpretation of sections . It is an interdisciplinary field that is largely concerned with the three dimensional interpretation of planar sections of materials or tissues. It… … Wikipedia
Katana construction — was the labour intensive bladesmithing process developed in Japan for forging katana and other Japanese blades. Katana and wakizashi were often forged with different profiles, different blade thicknesses, and varying amounts of grind. Wakizashi… … Wikipedia

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