Chapter 8

Question 1

Aging

Answer 1

heat treatment that precipitates a second phase from a supersaturated solid solution

Question 2

What is Anneal

Answer 2

A heat treatment process used to lower defect concentration in metals and glasses that result in softer, less brittle materials.

Question 3

What is Bainite

Answer 3

is a two-phase microstructure consisting of ferrite and cementite. Bainite forms when an austenitic steel is quenched to a temperature below the pearlite region but above the martensite start (Ms) temperature.

Question 4

What is a Critical nuclues

Answer 4

a nucleus of the size such that either growth or dissolution will decrease its free energy.

Question 5

What is Kinetics

Answer 5

the study of the rate of reactions and the factors that affect them, including the influence of time on phase transformations.

Question 6

Supersaturation

Answer 6

The excess of solute in a given phase due to rapid quenching below the solvus temperature.

Question 7

What is pearlite

Answer 7

A two phase microstructure of alternate ferrite and cementite lamellae occurring in some steels. Pearlite forms by the decomposition of austinite.