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Near the Ms temperature region below 400 ℃, it should be slowly cooled in order to minimize the martensitic transformation of stress. This ensures that the conditions of access to martensite, reduce the stress of quenched to avoid workpiece deformation or cracking. The characteristics of the laser quench to stop heating the moment the temperature reaches the highest, then cooled to 104 ~ 105 ° C / s cooling rate, is much larger than the maximum cooling rate (2000 ° C / s, and 2830 ° C / s) quenching medium for saline or alkaline , according to the relationship between cooling rate and time can be inferred that the laser quenching the cooling curve of the steel ideal for quenching the left side of the cooling curve, curve 1 in Figure 2. The information process of green laser pointer is also the important step of green laser pointer .
Figure 3 shows the relationship between the organization close to the equilibrium state with temperature and alloy composition on the thermodynamics of iron-carbon alloy phase diagram. With slow heating rate of heating up the steel austenitic, can reach the level of close to balance. Austenite is generated generated by the nucleation and growth of carbide dissolution and austenite grain growth, are dominated by the diffusion process. Laser heating process, when the heating rate is high enough (greater than 400 ~ 500 ° C / s), and iron and steel in the ferrite phase α can reverse transformation of the martensitic transformation occurs at a critical temperature (about 900 ° C) to shear way to instantly generate the same ingredients of the austenite phase of γ. To follow the non-proliferation changes in the law [9].  led flash light adopts the high quality chip.
Austenite formation kinetics shows that the austenite nucleation rate and growth velocity increases with increasing temperature of austenite in steel, and thus the laser rapid heating conditions, the austenite-shaped nuclear pole high. Laser transformation hardening is mainly used in surface treatment, compared with other surface treatment methods have the following characteristics: high energy density of the laser beam on the workpiece surface, quick heating, quick cooling, fine martensitic hardened layer hardness than conventional quenching 5% -20% higher. Workpiece surface is only a small amount of metal is heated, low energy consumption, almost no heat distortion, small deformation of the workpiece. Eliminates the need for straightening and grinding processes, to facilitate the precise parts of the local surface hardening. The working state of green laser pointer should be checked.
Can bore or groove side and the bottom of the quench and the complexity of local quenching of the workpiece surface, while difficult to solve by other means. The focused beam depth of focus, allow the surface there is considerable irregularity, facilitate the quenching of the splined sleeve and gear. Hardening depth and area of precision control. Laser quenching the exception of thin pieces of hardened generally available to self-cooling without quenching agent such as oil, water, and no great harm. The process is simple, the time of quenching, the quenching process can be arranged in the pipeline. The disadvantage of laser hardening. Hardening depth is restricted, generally less than 1mm, the development of the current study has increased the depth of initial success, there are reports of up to 3mm. Safety of green laser pointer workshop is in the first place.
Metal wavelength 10.6μm laser reflectivity is high, in order to increase the absorption rate of the laser, for surface coating or other pretreatment. Laser transformation hardening temperature field theory. Processing and use of high-energy laser on the metal surface has 20 years of history. The laser surface modification can improve the material a certain amount of service life. All cast iron, carbon steel and tool steel can be laser hardening to increase their wear resistance and corrosion resistance. Laser scanning the workpiece, the thin layer of material of the part surface to absorb radiation, to form a heat source. The heat source for heat conduction to the parts matrix, causing the internal temperature occurred from low to high to low thermal cycle. Quality of green laser pointer can be determined by the machining process of green laser pointer .