MSE 201 – Laboratory IThe University of Tennessee Materials Science and Engineering Kurt Johanns MSE 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 or Mail Box 4 th 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 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 DuctileBrittle

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)