Research on the temperature field in laser hardening

Abstract

Temperature field in the laser hardening process was numerically simulated by MSC.Marc software. The influence of energy density on laser hardening effect is analyzed. Simulation result is verified through the thermocouple temperature transducer measuring the specimen surface temperature under the laser irradiation. Experimental curves of temperature versus time are in agreement with simulation results. The simulation results can be regarded as a basis for choosing laser technological parameters. r

Numerical analysis and experimental validation of hardness and microstructural changes during laser transformation hardening of low alloy steel plates

“…8 The temperature field in the laser hardening process is numerically simulated, the influence of energy density during laser hardening is analyzed and the size of the hardened layer is predicted. 9 The finite element modeling technique is used to simulate the steady-state and transient effects of moving beams with different beam shape (circular, rectangular and triangular) in transformation hardening of EN43A steel and it is reported that the triangular laser beam produces the best thermal history to achieve better transformation and high hardness. 10 A mathematical and numerical model is proposed 11 to determine the size of the hardened zone after laser treatment and to estimate the phase fractions in the heat-affected zone.…”

Experimental Studies on the Microstructure and Hardness of Laser Transformation Hardening of Low Alloy Steel

“…Laser transformation hardening is a method in which the high power laser beam quickly irradiates the workpiece surface to increase rapidly the workpiece surface temperature that is higher than the austenite transformation temperature and lower than the melting point. After passing of the laser beam from specified zone, the cooling base quickly cools the heated region to quench by itself so that the specimen surface is hardened and its performance is modified and improved [23]. Figure 3(a) shows dependence of power density, specific energy and interaction time at laser metalworking processes.…”

Optimized laser processing of calibration blocks for grinding burn detection with Barkhausen noise

“…By using low laser power values, heat conduction is the predominant heat transfer phenomenon. Wang et al (2006) stated that the surface temperature control of laser processing could be done by adjusting the laser parameters: the beam power, laser beam traverse rate and the diameter of the laser beam. Naturally, the properties of laser-processed materials such as thermal conductivity, density, heat capacity and thermal diffusivity also affect heat conduction into the material.…”