MSE 201 – Laboratory IThe University of Tennessee Materials Science and Engineering Kurt Johanns...
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Transcript of MSE 201 – Laboratory IThe University of Tennessee Materials Science and Engineering Kurt Johanns...
MSE 201 – Laboratory IThe University of Tennessee
Materials Science and Engineering
Kurt Johanns
MSE 201 - Laboratory I
Mechanical Properties of Metals
MSE 201 – Laboratory IThe University of Tennessee
Lab Report Guidelines
Hardness Testing
Tensile Testing
Charpy Impact Testing
Outline
MSE 201 – Laboratory IThe University of Tennessee
Lab Report Guidelines
Due One Week After Data is Posted
Email or Mail Box 4th Floor
Attach Calculations
Any Format You Like
Develop Thoughts and Answer Questions in Complete Sentences
MSE 201 – Laboratory IThe University of Tennessee
Safety
Wear Protective Clothing
Watch Your Surroundings
MSE 201 – Laboratory IThe University of Tennessee
Mechanical Properties
MSE 201 – Laboratory IThe University of Tennessee
Materials
1. As Received (Cold Rolled) 1018 Carbon Steel:
10xx = Plain Carbon Steel
1018 = 0.18 wt% Carbon
Contains Trace Mn, P, and S
2. Annealed 1018 Carbon Steel
870 Degrees C for 2 hrs
Cooled Slowly with Furnace for 24 hrs
MSE 201 – Laboratory IThe University of Tennessee
Tensile Testing
Known Dimensions:
Gauge Diameter (in.)
Gauge Length (in.)
What is Measured:
Applied Load (lbs)
Elongation (in.)
MSE 201 – Laboratory IThe University of Tennessee
Stress vs Strain
E
UTS
Calculated Properties:
Young’s Modulus
UTS
0.2% Yield Stress
Failure Stress
% Elongation
Ductility
Toughness
“Cold Rolled”
MSE 201 – Laboratory IThe University of Tennessee
Hardness Testing
Hardness: The Measure of a Material’s Resistance to Deformation by Surface Indentation or Abrasion.
Adjectives: “Hard” or “Soft”
Hardness Tests:
Vickers and Knoop Hardness – Diamond Pyramidal
Mohs Hardness Scale - Scratches
Rockwell Hardness – Spherical Indents
MSE 201 – Laboratory IThe University of Tennessee
Rockwell Hardness
HRB and HRF Scales:
HRB – 1/16 Diameter Steel Ball – 100kgf
Cu and Al Alloys, Soft Steels
HRF – 1/16 Diameter Steel Ball – 60kgf
Annealed Alloys and Steels
The Resulting Hardness Number Is Determined From the Indent Depth of Penetration
MSE 201 – Laboratory IThe University of Tennessee
Hardness Testing
Procedure:
Clean Surface Thoroughly
Sample Thickness > 10x Indent
Indents 3x-5x Indent Diameter Apart
Correct for Surface Curvature (ASTM E-18)
Use Superficial Scales for Thin Samples
MSE 201 – Laboratory IThe University of Tennessee
Rockwell Hardness
Minor Load Displacement
Major Load Displacement
RH is a Function of
MSE 201 – Laboratory IThe University of Tennessee
Rockwell Hardness
Flat Surface
Flat Surface
ASTM E-18 for Correction
MSE 201 – Laboratory IThe University of Tennessee
Charpy Impact Testing
MSE 201 – Laboratory IThe University of Tennessee
Brittle to Ductile Transition
Impact
Energy
Temperature
Transition
Range
MSE 201 – Laboratory IThe University of Tennessee
Fracture Surfaces
Ductile Brittle
MSE 201 – Laboratory IThe University of Tennessee
Charpy Impact Testing
Impact Conditions:
Extreme Conditions
High Strain Rate
Triaxial Stress States
ASTM Standard E-23
5 cm
1 cm
MSE 201 – Laboratory IThe University of Tennessee
Charpy Impact Testing
h = 0
At Impact
h = h1
h = h2
MSE 201 – Laboratory IThe University of Tennessee
Charpy Impact Testing
Five Temperature Ranges:
Liquid Nitrogen (-196 deg C)
Dry Ice (-78 deg C)
Ice Water (0 deg C)
Room Temp (25 deg C)
Boiling Water (100 deg C)