Section through case-hardened steel

Section through case-hardened steel

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Caption: Case-hardened steel. Light micrograph of a section through a case-hardened steel tool. The brown area (right) is the original low-carbon (soft) steel, the orange area (left) is case-hardened. Case-har- dening is performed when soft steel has been used to manufacture a tool, which allows easy finishing of the piece. In order to harden the surface, the tool is either heated near a source of carbon or dipped into liquid sodium cyanide. Carbon atoms dissolve through the metal, altering its crystal structure and increasing mechanical strength. Magnification unknown.

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Keywords: case harden, case hardened, case hardening, chemical, chemistry, compound, compounds, materials science, steel

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