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MEE 312 Test 4 Cards
| Term | Definition |
|---|---|
| austenite | name for FCC iron |
| bainite | Two-phase microconstituent containing ferrite and cementite. |
| cast iron | Ferrous alloys containing sufficient carbon so that the eutectic reaction occurs during solidification. |
| cementite | Hard, brittle intermetallic compound (Fe3C). |
| cross slip | The change in the slip system of a dislocation. |
| cross linking | The process where polymer chains become attached together creating a polymer that is much stronger with lower ductility. |
| degree of polymerization | The number of monomers in a polymer; the length of a molecular chain. |
| endurance limit | The stress below which a material will not fail in a fatigue test regardless of the number of cycles applied. |
| engineering strain | The amount that a material deforms per unit length when pulled or pushed (l / l0). |
| engineering stress | The applied load divided by the original cross-sectional area. |
| ferrite | A solid solution of one or more elements in BCC iron , the BCC phase on the iron-carbide phase diagram. |
| GP zones | Tiny clusters of atoms that form early on in the age-hardening process. |
| heterogeneous nucleation | Formation of a critically sized solid from the liquid on an impurity surface or the surface of the mold wall. |
| homoegeneous nucleation | Formation of a critically sized solid from the spontaneous cluster of atoms due to severe undercooling. |
| Hume-Rothery Rules | Necessary but not sufficient conditions that an alloy system must meet in order to display unlimited solubility; includes same crystal structure, similar atomic size, same valence, similar electronegativity. |
| normalizing | A simple heat treatment obtained by austenitizing and air-cooling to produce a pearlite microstructure in steels. |
| offset yield strength | A yield strength obtained graphically that describes the stress that gives no more than a specified amount of plastic deformation. |
| pearlite | A garden additive used to help impart thermal resistance in homemade bricks. |
| recovery | A stage in the annealing process where the material is subjected to a low temperature heat treatment (below Trc) causing the dislocations to rearrange themselves into a polygonized substructure, this stage of annealing eliminates residual stresses |
| temper designation | A shorthand notation used to describe the processing of an alloy. |
| wrought alloys | Alloys that are shaped by a deformation process. |
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