LAB+1+HARDNESS++PART+I_Spring+2016

LAB+1+HARDNESS++PART+I_Spring+2016 - MFGT 150 Intro to...

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MFGT 150: Intro to Engineering Materials Spring 2016 Lab 1: Hardness Test Assignment Date: _2/1/16___________ Student Names:_________________________ _______________________________________ _______________________________________ Purpose: Describe assignment purpose here… IMPORTANT: Please (i) review this handout, and (ii) observe the demonstration of machine operation by your lab instructor before starting the test. Safety Precautions for Hardness Test Lab 1. Be careful not to damage the penetrator or the anvil by forcing them together when a specimen is not in the machine. 2. The indenter and the anvil should be clean and well seated. 3. The surface to be tested should be clean and dry, smooth, and free from oxides. A rough ground surface is usually adequate for the Rockwell and the Brinell tests. 4. The surface should be flat and perpendicular to the indenter. 5. Be sure that the indenter will make a mark at least 1/8” away from the edge and another test indentation when using the hardness tester. Closely spaced indentations and edge effects cause substantial errors in measurements. The spacing between indentations should be at least three to five times the dia of indentation. 6. Be sure to use the correct load, indenter type, and the Rockwell scale for your given material. Notes on the Hardness test 1. Surfaces that are ridged perceptibly to the eye by rough grinding or coarse machining offer unequal support to the penetrator. When testing bar stock or forgings, it is advisable to remove enough of the surface by grinding or machining so that the indenter will test the true metal underneath. 2. A fairly smooth surface is necessary for accurate work, so the scale caused in hardening or other treatments should always be removed before testing. 3. For accurate results, the specimen must be of such thickness that the under-surface of the specimen, after testing, does not show the slightest indication of impression. This thickness will vary greatly according to the hardness of the material tested.
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