Instructions: Type your answers to the following questions (no hand-written work
ID: 1843143 • Letter: I
Question
Instructions: Type your answers to the following questions (no hand-written work).
Chapter 7: Ferrous Metals and Alloys
What properties or characteristics have made steel such an attractive engineering material?
What is a plain carbon steel?
What are some of the common alloy elements added to steel?
What factors might be used to justify the added expense of precoated steel sheet?
What is stainless steel?
What is tool steel?
Chapter 8: Nonferrous Metals and Alloys
List some of the nonferrous metal properties or combinations of properties that are not available in the ferrous metals.
Because __________ has properties that are generally between those of steel and aluminum, it importance has been increasing rapidly.
a. magnesium
b. lithium
c. titanium
Superalloys are based on ________, ________, and nickel, or _________.
While technically not a metal, _______ is an engineering material with considerable potential.
a. beryllium
b. Babbitt
c. graphite
Chapter 9: Nometallic Materials: Plastics, Elastomers, Ceramics, and Composites
The terms thermosetting and thermoplastic refer to the material’s response to elevated _________.
a. temperature
b. pressure
c. force
List five types of thermoplastics.
List five types of thermosets.
List the primary roles of fillers.
List the most common fillers.
Elastomer refers to a special class of linear polymers that display an exceptionally large amount of elastic deformation when a ________ is applied.
a. force
b. pressure
c. high temperature
Explanation / Answer
7
a) Good tensile strength
b) Formability i.e the region of plasticity is good enough for forming
c) Heat treatable
d) Good strength to weight ratio
e) Abundant availability
f) Ductile which is good for design for failure
g) Cheap enough
7.b)
Plain carbon steel is the combination iron (Fe) and carbon (C). The types of carbon steels are classified based on the carbon content added in it as high carbon steels, medium carbon steels and low carbon steels. However the elements like magnesium, copper etc are added in small amounts or included as impurities which won't alter the properties. Adding carbon hardens the iron.
7.c)
Manganese, Copper, chromium, cobalt, Nickel, Molybdenum and Boron are some the most common elements added to steel for alloying it.
7.d) Precoated steel may replace an another costly material like copper. The strength obtained may also be good comparing with other materials. Corrosion resistant properties may also justify the case.
7.e)
Steels alloyed with chromium are called as stailess steels. Atleast 10% Cr is added as an alloy. Several types of stainless steels are also present in the industry. The main purpose of stainless steels is to provide corrosion resistance. By ths, we can use the strength of steel and corrosive resistance of the chromium in one material called as stainless steel.
7.f) Any steel used as a tool may be called as tool steel technically. Generally, the term is reserved for high quality steels used for cutting and forming processes.Good hardness, abrasion resistance are highly desirable properties.
Four major elements added for achieving them are Tungsten, Chromium, Vanadium and Molybdenum. They are also classified based on quenching media.