Lab 8 Letter Report Final 2.pdf - CIV-MARK TESTING LABS INC...

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Krishna Patel Enclosures (7) CIV-MARK TESTING LABS, INC. We are the best, for your material test 304 East Daniel St Champaign, IL 61820 November 3, 2020 Dr. John Popovics Popovics Manufacturing Co. 459 W Newmark Ave. Morristown, NJ 07261 Dear Dr. Popovics, On behalf of Civ-Mark Testing Labs, we are thankful you have chosen to test your materials with us. Four 1045 steel specimens were placed in a furnace to be given heat treatments. All the specimens were given the following heat treatments: annealing, normalizing, quenching, and tempering. One of the specimens was given a Jominy hardenability test. The results of the test conclude that the heat treatment that created the strongest specimen was quenched, then followed by tempered, normalized, and then annealed, respectively in that order. The same trend can be seen in their Brinell hardness values with 360HB, 214HB, 180HB, and 135HB (respectively). Furthermore, the percent reduction of area was calculated to be high numbers for the 1045 steels that were annealed, normalized, and tempered. However, the percent reduction for the quenched 1045 steel was calculated to be a negative number, perhaps due to the edge ridges of the specimen after the fracture. All of this data can be found in Table 1 of the appendices. The quenched 1045-steel was the only material noted to have a flat surface fracture while the other three materials experienced a cup and cone fracture style. This demonstrates that quenching a material can cause it to become more brittle, compared to the other heating treatments. For the Jominy hardenability test, the 6150 steel had a relatively stable Rockwell-C hardness until the distance of 26 mm was reached. Then the Rockwell-C hardness number can be seen to drop and go on a downward trend until the HRC value of 43 at 66 mm. Then the values seem to get relatively more stable at the end. Lasty, to discuss the Jominy hardenability testing, it can be concluded that the end that was cooled by the water jet was harder than the end that was air cooled. So, it is important to cool only one end because that allows the other end to be cooled by air. The negative linear correlation seen in Figure 3 in the appendices shows the hardness as you go further from the water-cooled side, and the hardness gets lower. So overall,

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