Dendrites in high-speed steel

Dendrites in high-speed steel

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Credit: R. RIEDL, F. JEGLITSCH & K-D. LOCKER/ SCIENCE PHOTO LIBRARY

Caption: Scanning electron micrograph (SEM) of dendrites in a sample of high-speed steel. Dendrites are typic- al of cast materials, which are solidified from the molten, liquid state in a mold. Solidification is complex & dynamic. Fingers of solid, or primary dendrites, grow within the melt, & they send out secondary & tertiary arms at specific angles. The ladder-shaped dendrites in this micrograph consist of metal carbides. They have been exposed by prolonged acid etching. The form of the dendrites, & the microstructure around them, results from use of niobium as an alloying element in the steel. Magnification: x280 at 35mm size. Ref: MICROCOSMOS, fig. 7.14, page 133

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Keywords: alloy, chemical, chemistry, compound, compounds, dendrite, niobium, scanning electron micrograph, sem, steel

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