Abstract
A three-dimensional steady-state model for the cooling of laser tracks was developed. The analytical solution takes into account the thermo-physical properties of the substrate and the main parameters of the laser treatment, namely, the laser power and the beam scanning speed. It was established that scan velocity affects significantly the cooling rate behind the beam. The estimated cooling rates for various laser treatment parameters can be correlated with the different phase transformations, which take place during cooling of plain carbon steel, and which enable micro-structures to be obtained ranging from martensite to ferrite-bainite. The microstructure and the hardness of the treated 1020 steel substrates are in a good agreement with the calculated values of the cooling rates.
| Original language | English |
|---|---|
| Pages (from-to) | 47-55 |
| Number of pages | 9 |
| Journal | Lasers in Engineering |
| Volume | 11 |
| Issue number | 1 |
| State | Published - 1 Dec 2001 |
Keywords
- Cooling
- Laser
- Model
- Moving
- Rate
- Steady