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Carleton University MAAE Lab Report Lab 5 Materials – Surface Hardening and Strain Rate Sensitivity of Ductile and Brittle Fracture of Polymer Materials

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Lab Report Lab 5 – Surface Hardening and Strain Rate Sensitivity of Ductile and Brittle Fracture of Polymer Materials Student Name: Caleb Bulthuis Student No: 101078651 Date: November 26, 2018 La ... b Group/Group Members: Mackenzie Bauer, Matthew Jurgutis, Damon Kral 1. Summary The purpose of this laboratory was to observe how surface hardening a SAE 1045 steel sample affects the hardness, as well as observing the tensile behavior and properties of brittle and tensile polymers. The lab began with conducting hardness tests on surface hardened and as-received steels. The microstructure of three SAE 1045 samples, quenched, tempered and air-cooled, and as-received, were observed based on given photographs and microscope images taken during the lab. The lab group then went and observed tensile tests of two polymers, acrylic and polycarbonate, during high speed and low speed tests. 2. Results and Observations 2.1 Surface Hardening As Received: 37/44.3/8.6 Rc 900°C x 15min/Water quench: 5.3/71.7/12.84 Rc Surface Hardened: Carburized Layer Case Depth Calculation: 68/ / Rc 61/ / Rc 15 mm ? = ?????( -?? ?? ) ? ? = √?? D = 2.0628e-15 m2/s Xp = 1.363e-6 m 2.2 SAE 1045 Micrographs Sample #1 Water Quenched: Additional Observations Due to the rapid cooling process, large amounts of martensite formed, resulting in a very high strength steel 3 Sample #2 Tempered (Air Cooled): Additional Observations Tempering reduced stress in the steel, as well as increases ductility. Cementite is able to form, and larger grains form as well 4 Sample #3 As Received Additional Observations Cementite can be seen [Show More]

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