The purpose of metallographic sample preparation is to conduct microscopic analysis, so the hidden line that runs through the entire process of sample preparation is& Flash; QMAXIS&quo; P1200” This type of fine sandpaper is used for sample preparation.

However, if there are rust marks, deformation, overheated areas, poor observation surface (preparation surface), etc. on the surface of the sample, it is necessary to choose American metallographic sandpaper, which consumes a lot.

The poorer the observation surface (preparation surface), the more polishing steps there are, mainly reflected in the first half of the metallographic preparation process.

2. The endpoint refers to&flash& Flash; What magnification is required for microscopic analysis. The larger the magnification, the more polishing steps, mainly reflected in the second half of the preparation process.

If you observe under 100x conditions, you only need a polishing agent with a particle size of 1 micron to obtain a scratch free observation surface (preparation surface). As shown in the following figure:

(Gear steel, 1 micron polishing agent, 100 times.)

If observation is carried out under 1000x conditions, it is necessary to polish a polishing agent with a particle size of 0.05 microns to ensure a scratch free observation surface (preparation surface). As shown in the following figure:

(Gear steel, 0.05 micron polishing agent, 1000 times.)

From the above two points, it can be seen that metallographic sample preparation can refer to the following steps:

Case 1

Case 2

3. Difficulty refers to&ndash& Flash; Is there any characteristic of the sample material itself that can cause difficulties in the sample preparation process and poor preparation results. Generally speaking, materials that are particularly soft and brittle (with high hardness and poor plasticity) will increase the difficulty of sample preparation.

Taking soft materials as an example, they are particularly prone to scratches, so when using the same preparation steps, it is necessary to extend the preparation time or add transition steps.

Soft Material Option 1