Probable Schedule for 259 Spring 2007
17 January 2007
What changes mechanical properties of steels?
Steel designations
19 January 2007
Introduction to heat treatment of aluminum alloys
Aluminum alloy designations
Read: sects. 3.12, 4.3, 5.1, pp. 261-262, start chapter
6
(7th ed. - 3.12, 4.3, 5.1, pp. 269-270, start chapter 6)
22 January 2007
What is a phase?
Nature of solid solutions
Introduction to phase diagrams
Introduction to age hardening
Start Chapter 9 (6th and 7th eds.)
Problems:
1. Determine the chemical compositions of these steels: 1080, 4140, 9310, 52-100.
2. Determine the chemical compositions of these aluminum alloys: 1050, 3003, 7075, 5052.
3. Calculate the strength/weight (yield/density) ratio for 4140 steel and 7075 aluminum alloy, for both annealed and heat treated conditions.
24 January 2007
Tensile test - yield strength, tensile strength, elongation,
elatic and plastic deformation
Compare tensile test data for various materials
Read: more of chapter 6 (6th and 7th eds.)
26 January 2007
Hardness testing - Rockwell, Brinell, diamond
Hardness of martensite
Relation of hardness to tensile strength
Impact test
Brittle to ductile transition
Read: more of chapter 6 (6th and 7th eds.)
29 January 2007
Fracture toughness
Nature of fracture surfaces
Finding crack origins
Creep testing
Fatigue and S-N curves; beachmarks
Read: pp. 194-199, 201-203, 211-217, 221-225
(7th ed. - 208-215, 217-219, 227-234, 238-243)
31 January 2007
Plastic deformation and dislocations
Electron microscope images of dislocations
Dislocation slip
Read: sections 8.9, 7.1-7.3 (6th and 7th eds.)
2 February 2007
Slip planes in metals and alloys
The three simple crystal structures of most metals and alloys
Slip systems
Dislocation generators
Work hardening
Read: sections 7.4-7.6, 7.10 (6th and 7th eds.)
Study diagrams in sections 3.4 (6th and 7th eds.)
(text has some errors here & is misleading; ignore figure 3.3a, which
is just wrong!)
5 February 2007
Dislocation interactions
Solution hardening
Precipitation hardening
Slip systems
Critical resolved shear stress
Read: sections 7.8-7.10 (6th and 7th eds.)
7 February 2007
Ni-base superalloy example
Diffusion
Vacancies and vacancy diffusion
Jump frequencies
Read: chapter 5 (6th and 7th eds.)
9 February
Review
12 February 2007
Diffusion coefficients
Steel carburization example
The Fe-C phase diagram
Interstitial solid solutions
Pearlite
Read: pp 277-285
(7th ed. - pp 290-298)
14 February 2007
TTT curves
Cooling of hyoeutectoid steels
16 February 2007
Martensite
Martensite structure
Temperature range of formation; TTT curves & quenching
Read: pp 277-290; 302-314
(7th ed. - pp 290-303; 324-335)
Do problems in text: 9.55, 9.57, 10.14, 10.16
(7th ed. - 9.52, 9.54, 10.18, 10.20)
19 February 2007
Martensite toughness
Hardenability
Changing TTT curves
Do second set of problems on website
21 February 2007
23 February 2007
Shear & the martensite transformation
Tempering & toughness
Structure changes during tempering
Effects of temp/time
Austenitizing temps
Types of stainless steels
Read pp. 339-345, 219-220, 531-532
(7th ed. - pp 366-372, 236-237, 581-582)
See photos on pp. 91, 446 (7th ed. - 109, 483)
26 February 2007
Stainless steels, types, heat treatability
Fe-Cr, Fe-Ni phase diagrams
Tool steels
Powder metallurgy - press & sinter
Carbide tools
Read pp. 531-532
(7th ed. - pp 581-582)
28 February 2007
Ceramic tools
Cast irons
Discussion of some of the assigned
problems
2 March 2007
Review
5 March 2007
Case hardening
Jominy test and hardenability
Read pp. 339-345, 219-220, 361-368 (7th ed. - 391-399)
See photos on pp. 91, 446
7 March 2007
Quench severities
Use of hardenability curves
9 March 2007
Corrosion and Galvanic cells
Types of macro cells
Types of microcells
Read pp. 569-591 (7th ed. - 621-651)
19 March 2007
Corrosion and Galvanic cells
Types of macro cells
Types of microcells
21 March 2007
Cathodic protection
Passivation
Anodizing
Cr plating
Corrosion examples
Area effect
23 March 2007
What is a polymer?
Molecular weight
Chemical bonding
Functional groups
Polymerization
Polyesters
Read Chapter 14 (6th and 7th eds.)
26 March 2007
Nylons
Polyurethanes
Branching
Networks
Bakelite
Crosslinking
Vulcanization
28 March 2007
Tacticity - types
Copolymers - types
Blends
Molecular weight
Blow molding
30 March 2007
Review
2 April 2007
Crystallinity in polymers
Read Chapter 14 (6th and 7th eds.)
4 April 2007
Fiber strength
Tenacity
Stiffness
Yielding, relaxation, crazing
6 April 2007
Tensile strength
Tg
Viscous flow
Yielding, relaxation, crazing
9 April 2007
Creep, relaxation, recovery
PVC
Plasticizers
Polycarbonates
Aramids, Kevlar
11 April 2007
Epoxies. prepregs
Composites - matrix, dispersed phase
MMCs - strengthening mechanism
CMCs - fracture toughness improves
Read pp. 481-507, 527-538
(524-555, 577-588 – 7th ed.)
13 April 2007
PMCs - fibers
Vinyl esters
Matrix/fiber bond
Read pp. 538-563
(577-588 – 7th ed.)
Read pp. 144-151
(7th ed. - see web on Ashby charts)
16, 18, 20 April 2007
Fiber characteristics & behavior
Materials selection considerations
Use of Ashby charts
Read pp. 144-151
23, 25, 27 April 2007
More materials selection
30 April 2007
Review
2 May 2007
In-class exam