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Two Processing-Structure-Property Laboratory Activities to Culminate a Course in Engineering Materials

Mark A. Palmer

Associate Professor of Manufacturing Engineering Kettering University

Abstract

Most engineering students are required to take a course which focuses on Engineering Materials. A common theme of these courses is that Processing affects Structure which in turn affects Properties which ultimately determine Performance. Two laboratory sessions have been developed which demonstrate this principle: TTT Diagram Evaluation and Evaluation of Strengthening Mechanisms. To complete the TTT Diagram Evaluation laboratory the students evaluate the hardness and microstructure of heat treated 1080 steel samples. Heat treatments include heating below the austenite transformation temperature, heating above the austenite transition temperature and then cooling at elevated temperatures, and tempering martensite at various temperatures. The students then compare their results to those predicted by either the TTT diagram or coarsening theory. The Evaluation of Strengthening Mechanisms laboratory assignment requires that the students evaluate grain/particle size reduction, second-phase particle strengthening, solid solution strengthening, and work hardening. This is done by subjecting copper, single phase brass, and two 10 series steel alloys to various heat treatments, including forming martensite. The students perform a tensile test to evaluate the yield strength and ductility and take micrographs of the alloys.

Introduction

Bloom’s Taxonomy is key to the author’s philosophy of engineering education1. Rather than emphasize the lower levels of learning: Knowledge, Comprehension, and Application, the author feels that lower level undergraduates should be required to perform at the Analysis level and upper level undergraduates at the Synthesis level. It is felt that this better reflects the maturity of the students. Engineering Materials is a core engineering course designed for the junior year. The course has three objectives:

1) Specify suitable materials for a given application using the relationship between mechanical properties, processing and material structure.

“Proceedings of the 2005 American Society for Engineering Education Annual Conference & Exposition Copyright . 2005, American Society for Engineering Education”

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Palmer, M. (2005, June), Two Processing Structure Property Laboratory Activities To Culminate A Course In Engineering Materials Paper presented at 2005 Annual Conference, Portland, Oregon. 10.18260/1-2--14270