1. Collect the following properties into an expected data table for the 8 materials (A36HR, 1018CR, 1045CR, 1045HR, 1095CR), two Aluminum (2024 and 7075), and one cast iron (G20).
we will be testing: a. Tensile strength b. Yield strength c. Hardness (if you cannot find a hardness value, use a conversion from tensile strength). d. Ductility e. Toughness (This will be an approximate number. Toughness is the area under the stress-strain curve of a material. The curve is roughly approximated by the Yield and Tensile strengths on the vertical axis, and by ductility or % elongation on the horizontal axis. Use these numbers in an appropriate manner to produce an approximation of toughness. Include the formula used as part of the prelab.)
2. Plot the expected relationship between toughness and hardness for the steels used in this lab (A36, 1018CR, 1045HR, 1045CR and 1095CR). Describe how these 2 properties relate to each other. Explain why this relationship exists.
3-For the steel and cast iron samples, create an estimated plot of impact energy vs temperature using figure 8.16 at the temperatures that will be tested in this lab. Describe the expected behavior of the aluminum samples.
4. Examine the expected relationship between toughness and temperature for all samples. Use figure 8.15 to predict how the two aluminum samples will be affected by temperature. a. Briefly explain why the samples will behave in the stated manner. b. Which materials are expected to exhibit a ductile to brittle transition? c. Which are not expected to be affected by temperature?
5. Examine the expected relationship between toughness and carbon content for samples that have identical processing (cold rolled).
6. Examine the expected relationship between toughness and processing for the samples of the same material (1045).
It is suggested to find a consistent source for your information (i.e. all information from the same source). The manufacturer of the samples also provides basic material data for their materials: laboratorydevicesco.com Many of the above numbers can also be found on www.matweb.com