June 26, 2011
June 26, 2011
June 29, 2011
22.11.1 - 22.11.17
Teaching Demo to Reinforce how Mechanical Properties Change Due to Heat Treatment ProcessesAbstractLecture coupled with some hands on demonstration is a powerful teaching strategy forengineering students. This style of teaching was incorporated into an engineering materialsselection course. Students realize that changing material properties play an important role inunderstanding why materials are selected for different design specifications. Engineeringstudents take courses in mechanics of material, machine design, finite element analysis andcapstone senior projects. These courses require students to call out and specify the best and leastexpensive material according to some type of chemical, physical or mechanical loadingconditions. Students should understand the way a material behaves in service depends upon itsalloy composition, crystalline structure, manufacturing process and heat treat condition.This paper is written after developing a hands-on material lab that teaches engineering studentshow heat treatment processes affect material properties. Its main focus is with alloy steels,however, other metallic materials can be used and explored by the same procedure outlined inthe lab handout. The first part of the lab requires students to set up a heat treat furnace. Theyquench harden and temper ten charpy specimens. The range in hardness are from dead soft to itsmaximum hardness that the material can get. Hardness and toughness values are measured andthe data are plotted to generate material behavioral curves. From the Brinell hardness numberthe ultimate tensile strength is estimated and plotted against hardness and toughness values. Aseries of design questions in the lab handout helps reinforce the theory taught in the class roomto this hands-on learning process.
ASEE holds the copyright on this document. It may be read by the public free of charge. Authors may archive their work on personal websites or in institutional repositories with the following citation: © 2011 American Society for Engineering Education. Other scholars may excerpt or quote from these materials with the same citation. When excerpting or quoting from Conference Proceedings, authors should, in addition to noting the ASEE copyright, list all the original authors and their institutions and name the host city of the conference. - Last updated April 1, 2015