In this section: |
Microstructure Analysis & Metallography An electrical motor shaft spline gear, mounted longitudinally to show the depth of induction hardening (dark).  
This is a cross-sectioned gear, etched to show tooth case depth.  Microstructure Analysis & Metallography is usually conducted to determine a material's response to thermal heat treatment. The sample to be studied is often wet abrasive sectioned, cleaned and mounted in bakelite or a resin to hold it during grinding and polishing. The microstructure is revealed by selective etching with the appropriate acid solution and observed using an optical microscope. Every metal and nonmetal has a preferred microstructure created or modified by processing and heat treatment. Microstructure is the "fingerprint" of material processing. |