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Definition
When dislocations are present at an interface to relieve strain
Located mostly at dislocations. |
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Definition
| Steels whose compositions are to the left of the eutectoid |
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Definition
| A newly formed phase, which can reduce its Gibbs free energy by either growing or dissolving |
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Definition
Where 2 phases with same crystal structure and atomic spacing meet
Located throughout the matrix. |
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Definition
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Definition
| When nucleation occurs at random sites in the parent phase |
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Term
| The process by which powders are densified at elevated temperature to form nearly fully dense microstructure |
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Definition
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Term
| A two phase microstructure with alternate lamellar microstructure in steels |
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Definition
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Term
| The only phase which can produce martensite as a result of a rapid quench |
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Definition
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Term
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Definition
| Nucleation occurring at specific locations |
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Term
| Increasing the interfacial free energy, _____ the likelihood of homogenous nucleation. |
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Definition
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Term
| Decreasing the amount of undercooling below the eutectoid temperature _______ the pearlite spacing. |
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Definition
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Term
| The __________ process occurs at temperature roughly equal to about 0.5 Tm resulting in a gradual decrease in strength with time. |
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Definition
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Term
| Coring in metal castings is a direct consequence of _________ cooling from the melt to room temperature. |
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Definition
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Term
| Alloys that can form an extensive amount of _______ are materials that have high hardenability. |
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Definition
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Term
| As the undercooling decreases, the barrier to the nucleation event _________. |
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Definition
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Term
| Undercooling / supercooling |
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Definition
| the process of lowering the temperature of a liquid or a gas below its freezing point without it becoming a solid. |
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Definition
| located at grain boundaries |
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Term
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Definition
| When precipitation forms and becomes solid. |
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Term
| If we increase the amt of undercooling, the critical radius will _____. |
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Definition
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Term
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Definition
a round metal bar of standard size (indicated in the top image) is transformed to 100% austenite through heat treatment, and is then quenched on one end with room-temperature water.
The farther away from the quenched end that the hardness extends, the higher the hardenability. |
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Term
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Definition
Size of a stable nucleus -
Smaller particles redissolve into the liquid phase while larger particles will continue to grow |
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Term
| Lowering temp of system allows nucleation rate to _____ and atomic mobility to ____. |
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Definition
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Term
| Which has a lower energy barrier? Heterogenous nucleation or homogenous? |
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Definition
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Term
| Which type of interface has largest interfacial energy? |
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Definition
| Incoherent b/c unlike neighbors are present across the interface |
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Term
| An increase in interfacial energy , _____ the probability of homogenous nucleation |
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Definition
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Term
| Do homogenous or heterogenous nucleated phases grow faster? |
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Definition
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Term
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Definition
| An interstitial solid solution of carbon in delta iron (BCC) |
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Term
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Definition
| An interstitial solid solution of carbon in gamma iron (FCC) |
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Term
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Definition
| An interstitial solid solution of carbon in alpha iron (BCC) |
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Term
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Definition
| Eutectoid of alpha-ferrite and cementite with a lamellar microstructure of alternate alpha-Fe and cementite plates. |
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Term
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Definition
| Eutectoid of alpha-ferrite and cementite. |
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Term
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Definition
| Spherical particles of cementite in a matrix of alpha-ferrite. |
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Term
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Definition
| An interstitial solid solution of carbon in a BTC Fe crystal structure. |
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Term
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Definition
| Alloys with compositions to the left of the eutectoid reaction. |
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Term
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Definition
| Alloys with compositions to the right of the eutectoid reaction. |
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Term
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Definition
| Ferrite that forms prior to the eutectoid ferrite. |
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Term
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Definition
| Cementite that forms prior to the eutectoid cementite. |
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Term
| As isothermal hold temperature decreases, spacing of pearlite lamella _____. |
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Definition
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Term
| The nucleation rate exhibits a max/min as a function of temp? |
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Definition
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Term
| The time curve exhibits a max/min as a function of temperature? |
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Definition
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Term
| Strongest phase found in steel |
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Definition
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Term
| Most favorable phase found in steel |
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Definition
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Term
| Mos tempt factor controlling hardenability |
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Definition
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Term
| As any substitutional alloy is added, the critical quench ____ and the hardenability of the steel ______. |
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Definition
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Term
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Definition
When a heated alloys cools in non-equilibrium conditions.
This causes the exterior of the material to solidify before the interior. Coring causes the centers of the grains to retain more of the higher melting temperature element. |
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Term
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Definition
| Plastically deformed at a low temp |
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Term
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Definition
| Crystallization of a polymer |
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Term
| As distance from quenched end increases, Rockwell hardness ______. |
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Definition
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Term
Which one is athermal?
Austenite -> pearlite
Austenite -> bainite
Austenite -> martensite |
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Definition
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Term
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Definition
| the process of crystallization in a formerly crystal-free (amorphous) glass. |
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