June 14, 2015
June 14, 2015
June 17, 2015
26.1511.1 - 26.1511.12
Laboratory experiences with hot and cold working and heat treating typically handle and observe each type of process and its effects separately, carefully preparing specimens and testing and taking data using standard materials testing methods. Observation of results is relatively slow and driven by interpretation of test data. “The Chisel Test” provides a simple introductory comparison which actively engages students in the cold working, hot working, and quench hardening of carbon steel flat bar stock into simple tapered “chisels” and then testing the results by pounding the worked edges against each other. Effects of the process are observed immediately in the context which ultimately matters to an engineer: performance testing.
The active involvement, kinesthetic experience, and visual and auditory effects of hot-working steel create a high-sensory, engaging, memorable learning experience. Equipment is easily accessible and simple requirements allow the working of material to be performed by novices without a dedicated foundry area. Scalability of pre- and post-treatment testing makes variations on the activity applicable to a variety of depths and audiences. According to the needs of the course objectives, performance results can be compared alongside hardness testing data taken the same day, or even followed up with more extensive metallographic preparation and observation of grain structure. Inconsistencies in geometry and integrity of the worked surfaces provide opportunity for students to experience and work through the challenges of obtaining measurements, formulating analysis, and extrapolating conclusions in less-than-ideal conditions.
The activity has been applied as a demonstration activity by welding educators, and as a fuller laboratory exercise in engineering metallurgy or manufacturing process courses at multiple institutions. The effectiveness of the activity is assessed through observation of student participation during the activity, and from direct evaluation of student accomplishment of related learning objectives on exams and lab reports.
Morse, J. L., & Baugh, M. (2015, June), The Chisel Test: A Simple, Scalable Learning Activity to Compare Cold Working, Hot Working, and Quench Hardening of Steels Paper presented at 2015 ASEE Annual Conference & Exposition, Seattle, Washington. 10.18260/p.24849
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