Interactive MENG 426 Lab Tutorials Reading A Material History

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Presentation transcript:

Interactive MENG 426 Lab Tutorials Reading A Material History The American University in Cairo Mechanical Engineering Department MENG 426: Metals, Alloys & Composites Interactive MENG 426 Lab Tutorials Concluding Project Reading A Material History Prepared by Eng. Moataz M. Attallah Fall 2002

Concluding Project This is a concluding project because: It utilizes the knowledge gained in the entire course and lab work in a comprehensive manner. It highlights the relation between the lab session, class, and previous knowledge.

Introduction (1) One of the main tasks of a materials engineer is to read a specific material history. Material history readers exist in several fields (e.g. fracture analysis/reverse engineering). Material history traces the birth of the alloy of specific composition in a furnace as a wrought alloy, passing by all the manufacturing process it has gone through, welding, heat treatment process, and further surface finishing, strengthening processes, and possibly ending with pages about its service life.

Introduction (2) In contrast to human history, material history is not recorded on books; it is recorded on the material microstructure and its mechanical properties. Yet, reading human history out of a history book is much easier than reading the material history out of its microstructure!

Structure Property Relationship Processing History Primary & secondary manufacturing processes, heat treatment, etc… Microstructure Properties Structure-Property Relationship

Foundations Material History Manufacturing Heat Treatment Alloy Composition

I-Alloy Composition Knowledge Required: Phase diagrams (exp # 3,4,5,6,7) Invariant reactions (exp #3,4) Iron-Iron Carbide System (exp #4,5,6)

Alloy Composition

Alloy Composition

Eutectic Morphologies Eutectic Morphologies* * Morphology means the form, shape or outward microstructure of a phase rodlike lamellar globular acicular W. F. Smith

Alloy Composition (Fe-Fe3C)

Alloy Composition (Fe-Fe3C)

II-Manufacturing Processes Cast microstructure (exp #2) Bulk forming microstructure (project 1)

Cast Microstructure

Cast Microstructure

Rolled/Forged Microstructure

Forged Vs. Machined

III-Heat Treatment Heat treatment of low carbon steels (exp #5) Precipitation strengthening of non-ferrous alloys (exp#7)

Heat Treatment

Heat Treatment

Heat Treatment

Reading Tools Mechanical Testing Chemical Testing Hardness Testing Impact Testing Tension Testing Compression Testing Chemical Testing Spectroscopy

Project Details Refer to the sheet