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| >> GLOSSARY OF TERMS |
| I |
| IMPACT TEST Test designed to determine the resistance of metal to breakage by impact, usually by concentrating the applied stress to a notched specimen. |
| INCLUSION Particles of impurities [usually oxides, sulfides, silicates, etc.) that are held mechanically or are formed during the solidification or by subsequent reaction within the solid metal. |
| INDENTATION HARDNESS The resistance of a material to indentation. This is the usual type of hardness test, in which a pointed or rounded indenter is pressed into a surface under a substantially static load. |
| INDUCTION HARDENING A process of hardening a ferrous alloy by heating it above the transformation range by means of electrical induction, and then cooling as required. |
| INDUCTION HEATING A process of heating by electrical induction. |
| INGOT A casting for subsequent rolling or forging. |
| INHIBITOR A substance which retards some specific chemical reaction. Pickling inhibitors retard the dissolution of metal without hindering the removal of scale from steel. |
| INTERLEAVING The placing of a sheet of paper between two adjacent layers of metal to facilitate handling and shearing of rectangular sheets, or to prevent sticking or scratching. |
| INTERMEDIATE ANNEALING An annealing treatment given to wrought metals following cold work hardening for the purpose of softness prior to further cold working. (See Process Annealing.) |
| INTERRUPTED AGING The aging of an alloy at two or more temperatures by steps, and cooling to room temperatures after each step. Compare with progressive aging. |
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