Emergency Exits

1
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 08
2
CHE 333

• Materials Engineering
• Richard Brown
• rbrown_at_egr.uri.edu

3
Objectives

• Objective
• Introduce the area of materials science and
  engineering so that rational decisions involving
  materials in specific applications can be made.

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Outline

• Introduction, Types of Materials,
• Atomic Bonding, Crystal Structures.
• Solidification, Crystalline Defects.
• Phase Diagrams.
• Phase Transformations and Heat Treatments.
• Diffusion in the Solid State.
• Mechanical Properties of Metals.
• Strengthening Mechanisms and Failure.
• Mechanical Properties of Metals.
• Polymers
• Ceramic Materials
• Composite Materials
• Review Sessions.

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Exams, etc

• Exams
• One hour exams will be given during class on Sept
  29, Oct 27 and Nov 17 with one take home at the
  end of the semester, distributed on Dec 1 and due
  Dec 8th. 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 20 of the
  final grade. Homework will count for 20. 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.
• Contact
• Best method is by e-mail at rbrown_at_egr.uri.edu to
  get some help or arrange a meeting before class
  in Providence.
• .

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EXAM

• 1. What is the hardenability of a steel and
  how is it different from hardness. What does
  tempering do to a quenched steel that is 100
  martensite.
• 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.
• 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?
• 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.

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HOMEWORKS

• Homework assignments will be provided on the
  Monday class to be handed in 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.

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Book

• There is no book required
• Notes will be on the web page, as will homeworks.
• http//www.egr.uri.edu/che/course/CHE333Prov/index
  .htm
• Materials Science and Engineering An
  Introduction by William D. Callister
• William F. Smith, Materials Engineering
• Use the library.

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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.

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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.

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Examples

• Light weight cars aluminum, new alloys Audi,
  Chrysler.
• Fuel cells replacement for platinum catalyst,
  polymer membrane efficiency.
• Corrosion Alaska pipeline.
• Antifouling new coatings.

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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.

13
Ferrari 2001
M. Schumacher 14 races won out of 16
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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.

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Technology Development
Sword in Xian in China at the Terracota Army
Site. Today chrome plating and chromates are
environmental issues and their replacement is
sought.