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imse 250 final (1)
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Exam of 6 pages for the course imse 250 at imse 250 (imse 250 final (1))
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imse 250 finalCr, W, and V are commonly used metal elements added to steels to produce cutting tools. They
all have a _________ crystalline structure. - ANS-body-centered cubic
(2) Please judge the following statement: units that we usually use to define strain are mm and
inch. - ANS-F
(3) What is the name of the copper-zinc alloy? - ANS-brass
Which one of the following materials has the lowest carbon content? - ANS-(A) Cold finish 1040
carbon steel
Please judge the following statement: units that we usually use to define stress are N and kN
(newtons). - ANS-F
) Stainless steel's resistance to corrosion and staining and low maintenance make it an ideal
material for many applications. Besides carbon and iron, stainless steel must also have
__________ (element). - ANS-chromium
Among the following five groups of manufacturing processes, which one exploits the ductility of
certain metallic materials to produce parts? - ANS-deformation
The ductility of a steel test specimen can be found out by studying ___________________. -
ANS-(B) the ability of the specimen to stretch before it fractures
Questions 9-13: We feel that it is harder to bend the paper clip back to the original shape than to
bend it over initially because of the strain hardening effect. During this process, some material
properties at the bending location are changed. - ANS-increased
0) Continue with the "paperclip bending" question described in Questions 9. The Young's
modulus of the steel wire at the bent location will be ___________. - ANS-the same
Continue with the "paperclip bending" question described in Questions 9. The ductility of the
steel wire at the bent location will be _____. - ANS-decreased
Please identify what type(s) of deformation happened during this paper clip bending process
described in Questions 9. - ANS-plastic and elastic deformation
The steel wire to make paper clips as shown in Question 9 is manufactured by (wire) drawing,
which belongs to ______ material processing. - ANS-deformation
, Which material is most likely to be an engineering ceramic material such as silicon nitride,
silicon carbide, and a large number of oxides (instead of other types of engineering materials)? -
ANS-A
) Which material is the most ductile - ANS-C
Which material is the stiffest (see diagram in Question 14)? - ANS-A
) Two samples (that generate curves A and C in diagram in Question 14) after the above tensile
tests are shown as below. Please judge which one is more likely the sample characterized by
the above stress-strain curve C? - ANS-B
Generally speaking, for a steel, as its tensile strength decreases, its hardness __________. -
ANS-decreases
Young's modulus is one of the ___________ of an engineering material. - ANS-mechanical
properties
__________ do not exhibit a yield point, so an offset yield point (commonly set at 0.2% strain) is
used on these materials. - ANS-aluminum alloys
Which one of the following Fe-C phases does NOT have a body-centered cubic crystal
structure? - ANS-austenite
A six sigma process is one in which 99.99966% of all opportunities to produce some features of
a part are statistically expected to be free of defects (3.4 defective features per million
opportunities). Sigma (σ) refers to the statistical concept of __________. - ANS-standard
deviation
Annealing in a furnace gives ___________________ steel than normalizing in still air. -
ANS-weaker and more ductile
A steel bar (carbon content is known) is heated above the Austenite temperature and kept at
that temperature for a long time (fully Austenitized). It then is cooled down to the ambient
temperature at a constant given cooling rate (temperature decreases over time throughout the
cooling curve). Which diagram would you use to find out the crystallization structure of this steel
at the ambient temperature? - ANS-Continuous-Cooling-Transformation (CCT) diagram
Suppose surface A has roughness Rmax = 1 um and surface B has roughness Ra = 1 um.
Which surface is smoother? - ANS-A
Suppose surface A has roughness Rmax = 1 um and surface B has roughness Ra = 0.5 um.
Which surface is smoother? - ANS-cannot tell
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