Hardness prediction in multi-pass direct diode laser heat treatment by on-line surface temperature monitoring

2012 ◽  
Vol 212 (11) ◽  
pp. 2261-2271 ◽  
Author(s):  
Soundarapandian Santhanakrishnan ◽  
Radovan Kovacevic
Keyword(s):  
Heat Treatment ◽  
Surface Temperature ◽  
Diode Laser ◽  
Temperature Monitoring ◽  
Laser Heat Treatment ◽  
Laser Heat ◽  
On Line ◽  
Hardness Prediction

Optimization of the Case Depth of a Cylinder Made With 4340 Steel by a Control of the Laser Heat Treatment Parameters

2018 ◽  
Author(s):  
Rachid Fakir ◽  
Noureddine Barka ◽  
Jean Brousseau
Keyword(s):  
Heat Treatment ◽  
Numerical Model ◽  
Surface Temperature ◽  
Laser Power ◽  
Case Depth ◽  
Maximum Temperature ◽  
Laser Heat Treatment ◽  
Laser Heat ◽  
4340 Steel ◽  
Cylindrical Workpiece

This paper presents a numerical model able to control the temperature distribution along a 4340 steel cylinder heat-treated with Nd: YAG laser. The numerical model developed using the numerical finite element method, was based on a study of surface temperature variation and the adjustment of this temperature by a control of the heat treatment laser power. The proposed analytical approach was built gradually by (i) the development of a numerical model of laser heat treatment of the cylindrical workpiece, (ii) an analysis of the results of simulations and experimental tests, (iii) development of a laser power adjustment approach, and (iv) proposal of a laser power control predictor using neural networks. This approach was made possible by highlighting the influence of the fixed (non-variable) parameters of the laser heat treatment on the case depth, and has shown that it is possible by controlling the laser parameters to homogenize the distribution of the maximum temperature reached on the surface for a uniform case depth. The feasibility and effectiveness of the proposed approach leads to a reliable and accurate model able to guarantee a uniform surface temperature and a regular case depth for a cylindrical workpiece of a length of 50-mm and with a diameter of between 16-mm and 22-mm.

Effects of metal surface and beam shape on laser heat treatment using diode laser

2016 ◽  
Author(s):  
In-Duck Park ◽  
Su-Jin Lee ◽  
Jeong Suh ◽  
Kwang-Hyeon Lee ◽  
Eunjoon Chun ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Diode Laser ◽  
Metal Surface ◽  
Laser Heat Treatment ◽  
Beam Shape ◽  
Laser Heat

Controlled surface temperature laser heat treatment

1985 ◽  
Author(s):  
O. DE PASCALE ◽  
C. ESPOSITO ◽  
M. LEPORE
Keyword(s):  
Heat Treatment ◽  
Surface Temperature ◽  
Laser Heat Treatment ◽  
Laser Heat

Diode laser heat treatment of lithium manganese oxide films

2012 ◽  
Vol 258 (12) ◽  
pp. 5146-5152 ◽  
Author(s):  
J. Pröll ◽  
R. Kohler ◽  
A. Mangang ◽  
S. Ulrich ◽  
M. Bruns ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Manganese Oxide ◽  
Diode Laser ◽  
Oxide Films ◽  
Lithium Manganese Oxide ◽  
Laser Heat Treatment ◽  
Laser Heat ◽  
Lithium Manganese

Servo-Control Applied to the Parameters of the Laser Hardening Process for a Regular Case Depth of 4340 Steel Cylindrical Specimen

2019 ◽  
Vol 19 (3) ◽  
Author(s):  
Rachid Fakir ◽  
Noureddine Barka ◽  
Jean Brousseau
Keyword(s):  
Heat Treatment ◽  
Numerical Model ◽  
Surface Temperature ◽  
Laser Power ◽  
Case Depth ◽  
Laser Heat Treatment ◽  
Regular Case ◽  
Laser Heat ◽  
4340 Steel ◽  
Cylindrical Workpiece

This paper presents a numerical model able to control the temperature distribution along a 4340 steel cylinder heat-treated with laser. The numerical model developed using the numerical finite element method (FEM) was based on a study of surface temperature variation and the adjustment of this temperature by a control of the heat treatment laser power. The proposed analytical approach was built gradually by (i) the development of a numerical model of laser heat treatment of the cylindrical workpiece, (ii) an analysis of the results of simulations and experimental tests, (iii) development of a laser power adjustment approach, and (iv) proposal of a laser power control predictor using neural networks. This approach was made possible by highlighting the influence of the fixed (nonvariable) parameters of the laser heat treatment on the case depth and has shown that it is possible by controlling the laser parameters to homogenize the distribution of the maximum temperature reached on the surface for a uniform case depth. The feasibility and effectiveness of the proposed approach lead to a reliable and accurate model able to guarantee a uniform surface temperature and a regular case depth for a cylindrical workpiece of a length of 50 mm and with a diameter of between 16 and 22 mm.

Influence of high-power diode laser heat treatment on wear resistance of a mold steel

2019 ◽  
Vol 33 (2) ◽  
pp. 829-836 ◽  
Author(s):  
Changkyoo Park ◽  
Jinwoo Kim ◽  
Ahjin Sim ◽  
In-duck Park ◽  
Ho Jang ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Diode Laser ◽  
High Power ◽  
Laser Heat Treatment ◽  
Laser Heat ◽  
Power Diode ◽  
High Power Diode Laser
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