Transcript CHE 333 - Chemical Engineering

Emergency Exits
• Please make yourself aware of the
location of the emergency exits in this
room.
Food and Drink
• If you do bring food and drink into the
room, please take empty cups, and paper
etc. away with you.
Fall 12
CHE 333
Materials Engineering
Richard Brown
[email protected]
Website for all notes and information:http://che.uri.edu/course/che333/index.htm
Objectives
• Objective:
• Introduce the area of materials science
and engineering so that rational decisions
involving materials in specific applications
can be made.
OUTCOMES
Students of this class will achieve the
following outcomes:
• 1. An ability to design and conduct
experiments as well as the analyze
data.
• 2. Ability to communicate effectively.
Outline
• Introduction, Types of Materials,
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Atomic Bonding, Crystal Structures.
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Solidification, Crystalline Defects.
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Phase Diagrams.
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Phase Transformations and Heat Treatments.
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Diffusion in the Solid State.
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Mechanical Properties of Metals.
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Strengthening Mechanisms and Failure.
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Mechanical Properties of Metals.
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Polymers
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Ceramic Materials
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Composite Materials
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Review Sessions.
Exams, etc
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Exams:
One hour exams will be given during class on Oct 3, Nov 5 and Nov 30th
with one take home at the end of the semester, distributed on Dec 3rd and
due Dec 10th. Please see Dr. Brown to accommodate requests regarding
extra time and different locations. NO ELECTRONIC DEVICES DURING
EXAMS, INCLUDING PHONES, IPODS, CALCULATORS.
An example of the type of exam in this course will be shown in class.
Grading Basis:
Each of the four exams will count 10% of the final grade. Homework will
count for 20%. Laboratory reports will count for 30% of the final grade.
Presentations of the laboratory will count for 10%. If a student cannot make
an exam, make sure to call before with a legitimate reason for the absence.
No attendance at an exam with no legitimate excuse will count for a ZERO
If a student needs special provision please contact me.
Office Hours:
Dr. Brown has office hours 1-2 p.m. on Wednesdays in Crawford rm 110.
Teaching assistants will also be available.
EXAM
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1. Does the “hardenability” of a steel change with alloy
composition? and is it different from hardness?. What does
“tempering” do to a quenched steel that is 100% martensite. Does
it increase hardness, decrease hardness or no change?
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2 What is an edge dislocation and what is a screw dislocation.
Show how a Burgers circuit is constructed and compare vectors
for an edge and screw dislocation.
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3 How does carbon diffuse through iron? If a steel was
decarburizing, how would you solve to find the time to reduce the
carbon level to half the steel level and a depth of 0.5mm?
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4 Draw an engineering stress strain curve, and compare it with a
true stress strain for the same materials. Which curve would you
use to explain work hardening and what is work hardening. Show
how the 0.2% yield stress can be calculated.
HOMEWORKS
• Homework assignments will be provided in
class to be submitted on the following
Monday class.
E-Mail
• The e-mail address will be the “URI”
address used by the registrars office on
the official class roster.
“No Class” days
• October 8, no classes.
• November 7thth, No classes as Tuesday
classes on Wednesday.
• Dec 10th is last class in this course.
Labs
• Laboratory: Safety Class Wed Sept 12.
• Laboratories will start on Wednesday,
September 12, at 2:00 p.m. in room 121
Crawford Hall.
• Two powerpoint presentations and two
laboratory reports are mandatory (40% of
grade).
• All students must be registered in a lab
section.
Book
• There is no book required:
• Notes will be on the web page, as will
homeworks.
• http://www.egr.uri.edu/che/course/che3
33/index.htm
• Materials Science and Engineering; An
Introduction by William D. Callister
• William F. Smith, Materials Engineering
• Use the library.
Illness Policy
Illness Due to Flu
The H1N1 Flu Pandemic may impact classes this semester. If any of us develop flulike symptoms, we are being advised to stay home until the fever has subsided for 24
hours. So, if you exhibit such symptoms, please do not come to class. Notify me at
874-2707 or [email protected] of your status, and we will communicate through the
medium we have established for the class. We will work together to ensure that
course instruction and work is completed for the semester.
The Centers for Disease Control and Prevention have posted simple methods to
avoid transmission of illness. These include: covering your mouth and nose with a
tissue when coughing or sneezing; frequently washing your hands to protect from
germs; avoiding touching your eyes, nose and mouth; and staying home when you
are sick. For more information, please view www.cdc.gov/flu/protect/habits.htm <
http://www.cdc.gov/flu/protect/habits.htm> . URI information on the H1N1 will be
posted on the URI website at www.uri.edu/news/H1N1 <
http://www.uri.edu/news/H1N1> , with links to the www.cdc.gov <http://www.cdc.gov>
site.
Materials Engineering
• How to employ natural and other materials
for use by humans.
• Development of new materials.
• Understanding performance of materials.
• Improving performance of new and
existing materials.
Examples
• Ipods – external case – structural, color,
electronic components – mixtures of
elements, polymers for line widths.
• Medical devices, replacement joints – hips
– mixture of metals polymers and
ceramics.
• Environmental – processes, electroplating.
• Construction – new steels, coatings,
carbon fiber reinforcement.
Examples
• Light weight cars – aluminum, new alloys
Audi, Chrysler.
• Fuel cells – replacement for platinum
catalyst, polymer membrane efficiency.
• Corrosion – Alaska pipeline.
• Antifouling – new coatings.
Properties.
• Materials properties controlled by
1) composition – the elements
2) thermo mechanical history – heat and
mechanical deformation processes
3) structure – the phases present and their
distribution.
• These are all related. The composition controls
the structure somewhat as does the history.
• Optimize materials to obtain final properties. Eg
strength, cost, appearance, conductivity,
corrosion resistance, weight.
Ferrari 2001
M. Schumacher 14 races won out of 16
Materials Useage
Carbon fiber used in most
of the bodywork, even for
suspension components.
Titanium connecting rods
are used with fractured
surfaces for bearings onto
crankshaft for better
alignment. Strength to
weight important along
with stiffness.
Bearings also important.
Only three or four of these
cars built. 10 BILLION
bearings made per year.
Cost/performance very
different.
Technology Development
Sword in Xi’an in China at the
Terracota Army Site.
Today chrome plating and chromates
are environmental issues and their
replacement is sought.