MSE 201 – Laboratory I

1. Materials Science and Engineering Kurt Johanns MSE 201 - Laboratory I Mechanical Properties of Metals The University of Tennessee MSE 201 – Laboratory I

2. Outline Lab Report Guidelines Hardness Testing Tensile Testing Charpy Impact Testing The University of Tennessee MSE 201 – Laboratory I

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 The University of Tennessee MSE 201 – Laboratory I

4. Safety Wear Protective Clothing Watch Your Surroundings The University of Tennessee MSE 201 – Laboratory I

5. Mechanical Properties The University of Tennessee MSE 201 – Laboratory I

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 The University of Tennessee MSE 201 – Laboratory I

7. Tensile Testing Known Dimensions: Gauge Diameter (in.) Gauge Length (in.) What is Measured: Applied Load (lbs) Elongation (in.) The University of Tennessee MSE 201 – Laboratory I

8. Stress vs Strain Calculated Properties: Young’s Modulus UTS 0.2% Yield Stress Failure Stress % Elongation Ductility Toughness UTS s E “Cold Rolled” e The University of Tennessee MSE 201 – Laboratory I

9. 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 The University of Tennessee MSE 201 – Laboratory I

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 The University of Tennessee MSE 201 – Laboratory I

11. 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 The University of Tennessee MSE 201 – Laboratory I

12. Rockwell Hardness Minor Load Displacement d Major Load Displacement RH is a Function of d The University of Tennessee MSE 201 – Laboratory I

13. Rockwell Hardness Flat Surface Flat Surface ASTM E-18 for Correction The University of Tennessee MSE 201 – Laboratory I

14. Charpy Impact Testing The University of Tennessee MSE 201 – Laboratory I

15. Brittle to Ductile Transition Impact Energy Transition Range Temperature The University of Tennessee MSE 201 – Laboratory I

16. Fracture Surfaces Ductile Brittle The University of Tennessee MSE 201 – Laboratory I

17. Charpy Impact Testing Impact Conditions: Extreme Conditions High Strain Rate Triaxial Stress States ASTM Standard E-23 1 cm 5 cm The University of Tennessee MSE 201 – Laboratory I

18. Charpy Impact Testing h = h1 h = h2 h = 0 At Impact The University of Tennessee MSE 201 – Laboratory I

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) The University of Tennessee MSE 201 – Laboratory I