MCG 2360 Lab 3: Mechanical Properties of Steel following Heat Treatment/Hardening

MCG 2360 Lab 3: Mechanical Properties of Steel following Heat Treatment/Hardening Prepared By: Lab Group 1 - Thursday Team 7 Kevin Gravel, Odera Okoye, Katarina Drobnjakovic, 6 Matthew Stewart, Khalid Awil, (leadership role) Prepared For: Elisa Cantergiani University Of Ottawa November 6, 2014‘ ABSTRACT The purpose of this lab was to determine the hardenability and hardness of three 1samples of steel; low carbon steel 1018, medium carbon steel 1045 and an unknown steel sample C, using the Jominy end-quench test, Vickers hardness test and the three-point bending test. The Jominy end-quench test began with each steel sample being heat treated thus undergoing austenization and then being cooled on one end of the sample. After each sample was cooled, the hardness was measured using the Vickers hardness test, where a pyramidshaped diamond was used to apply pressure on the sample and the hardness was measured to be the size of the impression made from the diamond. Finally the three point bending test was performed on the steel 1045 sample, where force is applied along the ends and the center of the specimen to determine its modulus of elasticity, stress and strain. After completing the tests and observing the data, we learned that steel C had greatest hardness value at 58, with steel 1045 having a value of 57 and steel 1018 with a value of 34. This meant that steel C had the highest hardenability and we were able to identify the sample to be steel 4340, a high carbon steel alloy. From the three point bending test of the two samples of steel 1045, we found that the sample which was heated before hand and became martensite was very brittle, exhibiting a lower toughness while the other sample which was kept at room temperature, was ductile and showed plastic deformation before failure