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Flashcards in Chapter 6 Deck (16):
1

Define: Alloy

Metal composed of two or more elements, at least one of which is metallic (solid solutions and intermediate phases)

2

Define: Ferrous Metal

Metals based on iron.

3

Define: Solution

In which an alloy of one element is dissolved in another to form a single-phase structure.

4

Define: Substitutional vs. Interstitial

Substitutional: atoms of the solvent element are replaced in its unit cell by the dissolved element.

Interstitial: atoms of dissolving element fit into vacant spaces between base metal atoms in the lattice structure.

5

Define: Phase Diagram

Graphical means of representing the phases of metal alloy system as a function of composition and temperature.

6

Define: Segregation

When an alloy freezes, this occurs in the solid mass because of non-equilibrium conditions.

7

Define: Eutectic Alloy

Particular composition in an alloy system for which the solidus and liquidus are at the same temperature.

8

Define: Eutectoid Temperature

Melting Point of the Eutectic Composition

9

Define: Cast Iron

When the carbon content in the iron is between 2.1% and 5%

10

Define: Ferrite

Room temperature iron (alpha)

11

Define: Austenite

When ferrite reaches 912 C (gamma)

12

Define: Cementite

Fe3C ; intermediate phase in the iron-carbon alloy system.

13

Define: Steel

When carbon content is less than 2.1% to about .02%.

14

Define: Stainless Steel

Highly alloyed steels designed to provide high corrosion resistance. Principle alloying element in stainless steel is chromium.

15

Define: Free-machining Steel

Carbon steels formulated to improve machinability by alloying with elments such as sulfur, lead, tin, bismuth, and/or phosphorus. Help to lubricate the cutting operations, reduce friction, and break up chips for easier disposal.

16

Define: Superalloy

Group of high-performance alloys designed to meet very demanding requirement for strength and resistance to surface degradation at high service temperatures. (Iron-based, nickle-based, or cobalt-based)