MECH 2060 Exam 2 ACTUAL UPDATED QUESTIONS AND CORRECT ANSWERS

MECH 2060 Exam 2 ACTUAL UPDATED
QUESTIONS AND CORRECT ANSWERS
Heat Treatment - CORRECT ANSWERS✅✅Controlled heating or cooling of materials to
alter their physical or mechanical properties w/o changing shape


Heat Treatment in Manufacturing - CORRECT ANSWERS✅✅To soften, to Relieve, or to
strengthen the material


Two Phase System - CORRECT ANSWERS✅✅Most alloys consist of two or more solid
phases and may be regarded as mechanical mixtures


Liquidous Line - CORRECT ANSWERS✅✅the line separating the single-phase + liquid
regions from the homogenous liquid region


Solidus line - CORRECT ANSWERS✅✅On a phase diagram, the locus of points at which
solidification is complete upon equilibrium cooling, or at which melting begins upon
equilibrium heating.


Nickel Copper Alloy Phase Diagram - CORRECT ANSWERS✅✅is a chart that shows the
phases of a nickel-copper alloy at different temperatures and compositions. It helps determine
the solid, liquid, or mixed phases based on the alloy's composition. The diagram also shows
key points like eutectic reactions and solubility limits. This information is essential for
understanding how the alloy behaves during cooling and heating.


Eutectic point - CORRECT ANSWERS✅✅lowest temperature at which existence of a
liquid phase is possible


Iron Iron Carbide Phase Diagram - CORRECT ANSWERS✅✅Discloses the phases
compositions and their transformations occurring within the alloys during their cooling
/heating


What is the crystal structure of Ferrite? - CORRECT ANSWERS✅✅Body-centered cubic
iron

,What is the maximum solubility of Carbon in Ferrite? - CORRECT ANSWERS✅✅.02%
Carbon


What are the properties of Ferrite at room temperature to 727C? - CORRECT
ANSWERS✅✅Soft, Magnetic and ductile



What is the temperature range for Austentite? - CORRECT ANSWERS✅✅Between 1394
and 912 degrees C


What crystal structure does Austentite undergo? - CORRECT ANSWERS✅✅BCC to FCC



What is the maximum carbon solubility in Austentite? - CORRECT ANSWERS✅✅2.11%



What is a notable property of Austentite? - CORRECT ANSWERS✅✅Good formability



Is Austentite magnetic? - CORRECT ANSWERS✅✅No, it is non-magnetic



What is the carbon content of cementite? - CORRECT ANSWERS✅✅6.67%



What are the properties of cementite? - CORRECT ANSWERS✅✅Very hard and brittle,
intermetallic


Which elements can cementite alloy with? - CORRECT ANSWERS✅✅Chromium (Cr),
Molybdenum (Mb), and Magnesium (Mg)


Martensite - CORRECT ANSWERS✅✅A metastable iron phase supersaturated in carbon
that is the product of a transformation from austenite. Extreme hardness from lattice strain in
BCT structure


Eutectoid Steel - CORRECT ANSWERS✅✅Is known as Pearlite

, What is pearlite? - CORRECT ANSWERS✅✅A combination of ferrite and cementite in
alternating layers.


What are the mechanical properties of pearlite? - CORRECT ANSWERS✅✅They are
between those of ferrite and cementite.


Steel - CORRECT ANSWERS✅✅Iron with less than 2.11% Carbon is



Cast iron - CORRECT ANSWERS✅✅Iron with more than 4.5% Carbon is



Hypoeutectoid Steels - CORRECT ANSWERS✅✅Steels having less than the eutectoid
amount
of carbon (0.77 wt%)


Hyper-Eutectoid Steel - CORRECT ANSWERS✅✅Steel with more than 0.77% carbon
content.


Alloying elements does what - CORRECT ANSWERS✅✅Shifts the Eutectoid temperature
and eutectoid composition


Principal Heat Treatments - CORRECT ANSWERS✅✅annealing, martensite formation of
steel, tempering of martensite, precipitation hardening, surface hardening


Annealing - CORRECT ANSWERS✅✅Heating and soaking metal at suitable temperature
for a certain time, and slowly cooling


Reasons for Annealing - CORRECT ANSWERS✅✅- reduce hardness and brittleness
- obtain desirable mechanical properties
- soften metals for machining or forming
- recrystallize cold worked metals
- relieve residual stresses induced by shaping