MSE 201

1
Materials Science and Engineering Kurt
Johanns MSE 201 - Laboratory I Mechanical
Properties of Metals
MSE 201 Laboratory I
The University of Tennessee
2
Outline
Lab Report Guidelines Hardness Testing Tensile
Testing Charpy Impact Testing
MSE 201 Laboratory I
The University of Tennessee
3
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 I
The University of Tennessee
4
Safety
Wear Protective Clothing Watch Your Surroundings
MSE 201 Laboratory I
The University of Tennessee
5
Mechanical Properties
MSE 201 Laboratory I
The University of Tennessee
6
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 I
The University of Tennessee
7
Tensile Testing
Known Dimensions Gauge Diameter (in.) Gauge
Length (in.) What is Measured Applied Load
(lbs) Elongation (in.)
MSE 201 Laboratory I
The University of Tennessee
8
Stress vs Strain
Calculated Properties Youngs
Modulus UTS 0.2 Yield Stress Failure
Stress Elongation Ductility Toughness
UTS
s
E
Cold Rolled
e
MSE 201 Laboratory I
The University of Tennessee
9
Hardness Testing
Hardness The Measure of a Materials
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 I
The University of Tennessee
10
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 I
The University of Tennessee
11
Hardness Testing
Procedure Clean Surface Thoroughly Sample
Thickness gt 10x Indent Indents 3x-5x Indent
Diameter Apart Correct for Surface Curvature
(ASTM E-18) Use Superficial Scales for Thin
Samples
MSE 201 Laboratory I
The University of Tennessee
12
Rockwell Hardness
Minor Load Displacement
d
Major Load Displacement
RH is a Function of d
MSE 201 Laboratory I
The University of Tennessee
13
Rockwell Hardness
Flat Surface
Flat Surface
ASTM E-18 for Correction
MSE 201 Laboratory I
The University of Tennessee
14
Charpy Impact Testing
MSE 201 Laboratory I
The University of Tennessee
15
Brittle to Ductile Transition
Impact Energy
Transition Range
Temperature
MSE 201 Laboratory I
The University of Tennessee
16
Fracture Surfaces
Ductile
Brittle
MSE 201 Laboratory I
The University of Tennessee
17
Charpy Impact Testing
Impact Conditions Extreme Conditions High
Strain Rate Triaxial Stress States ASTM
Standard E-23
1 cm
5 cm
MSE 201 Laboratory I
The University of Tennessee
18
Charpy Impact Testing
h h1
h h2
h 0 At Impact
MSE 201 Laboratory I
The University of Tennessee
19
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)
MSE 201 Laboratory I
The University of Tennessee