Lecture 03/31

Question 1

Low carbon steels contain less than ?% of carbon and a typical yield strength of?

Answer 1

.25 wt%, 275 MPa

Question 2

For low carbon steels, strengthening is accomplished by?

Answer 2

Cold work

Question 3

Medium-carbon steels have carbon concentrations between?

Answer 3

.25 and .6 wt%

Question 4

Medium-carbon steels are most often utilized in the _ condition?

Answer 4

Tempered

Question 5

High-carbon steels have carbon contents between?

Answer 5

.6 and 1.4 wt%

Question 6

The predominant alloying element for stainless steels is? What percent?

Answer 6

Chromium, 11 wt%

Question 7

What are the types of cast iron?

Answer 7

Gray, ductile, white, malleable, and compacted

Question 8

What are the limitations of ferrous alloys?

Answer 8

High density, low electrical conductivities, poor corrosion resistance

Question 9

What are cast alloys?

Answer 9

Alloys that are so brittle that shaping by deformation is not possible

Question 10

What are wrought alloys?

Answer 10

Alloys amenable to mechanical deformation

Question 11

What are the nonferrous alloys?

Answer 11

Cu, Al, Ti, Mg, Noble metals, and refractory metals

Question 12

What is annealing?

Answer 12

Material is exposed to an elevated temperature for an extended time and slowly cooled

Question 13

What are the benefits of annealing?

Answer 13

Relieve stress, increase softness/ductility/toughness, produce a specific microstructure

Question 14

What is hardenability?

Answer 14

Ability of an alloy to be hardened by the formation of martensite due to a heat treatment

Question 15

What is the procedure used to determine hardenability?

Answer 15

Jominy end-quench test

Question 16

What is precipitation hardening?

Answer 16

Formation of small particles of a second phase within the original phase matrix