News

How does a metallographic microscope work? How does it use optical principles to observe the organizational structure of metal materials?

Publish Time: 2024-04-24
A metallographic microscope is a microscope commonly used to observe the structure of metallic materials. Its working principle is based on optical principles and mainly includes two modes: transmission optics and reflection optics.

Transmission optical mode: In the transmission optical mode, after the sample is thinly sectioned, the light emitted by the light source passes through the sample and is absorbed, scattered or transmitted by the tissue structure. The light after passing through the sample is focused by the objective lens to form a magnified image, which is then observed through the eyepiece. According to the differences in the degree of light absorption, scattering or transmission of different organizational structures, microstructures such as crystal grains, phase boundaries, and pores of metal materials can be observed.

Reflective optical mode: In the reflective optical mode, the sample surface does not need to be sectioned, and the organizational structure of the sample surface is directly observed. After the light emitted by the light source is focused by the objective lens, it hits the sample surface and is then reflected back. According to the differences in the reflection characteristics and organizational structure of the sample surface, the crystal grains, particle distribution, phase boundaries and other structures on the surface of the metal material can be observed.

Metallographic microscopes are usually equipped with objective lenses and eyepieces of different magnifications to observe the metal structure at different magnifications. At the same time, it can also be equipped with accessories such as polarizers and filters to observe the crystal morphology, grain orientation and other characteristics of the sample.

Observing the organizational structure of metal materials through a metallographic microscope can help engineers and scientists understand the relationship between material performance, processing technology and microstructure, and then guide material design, preparation and application.
×

Contact Us

captcha