Microstructure-hardness-lab(3)

Microstructure-hardness-lab(3) - Microstructure of Metallic...

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Unformatted text preview: Microstructure of Metallic Materials & Hardness Measurements Objectives/Purpose To familiarize students with some microstructural features in metals (single and multi-phases). To familiarize students with methods of in characterizing the observed microstructures. Calibration of optical microscope Estimate feature size of interest. Basic mechanical property measurement: Hardness Rockwell hardness (HR B or HR c ): different shape of indenter and indenting load Microhardness (Vickers hardness H v ): same shape of indenter with different indenting load Structure of Metals Metals are giant structures of atoms held together by metallic bonds. Most of metals are closed-packed , however it is It would be misleading to suppose that all the atoms in a piece of metal are arranged in a regular way. Any piece of metal is made up of a large number of "crystal grains", which are regions of regularity. At the grain boundaries atoms have become misaligned. This misalignment can be revealed via reflective optical microscopy, since the boundary scatters the incident light do not allow for reflection. Reflective Optical Microscopy...
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This document was uploaded on 10/28/2011 for the course MSE 250 at Michigan State University.

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Microstructure-hardness-lab(3) - Microstructure of Metallic...

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