The skilled expert of green laser pointer has approved the inspection report

the temperature had the highest intersection above the critical temperature of austenite, quench the fullest, which is generally higher in the layer of martensite content and hardness is also high; transition temperature region is relatively low, so the phase transition is not complete, but the tissue content of martensite in low 'or the base body is almost the original organization, the hardness is still the original hardness. Correspond with the organization after quenching, the hardness distribution deal outside to the inside surface of the typical curve shown in Figure 4-5. The skilled expert of green laser pointer has approved the inspection report.
AB segment of solid state phase transition area, BC section of the transition zone, C is the matrix later. Iron-based materials after laser quenching, the material surface to form a very fine martensite, high dislocation density and stress, so the surface of the mechanical properties have been improved. Large number of experiments and practice have proven laser quenching, the workpiece wear resistance, fatigue resistance, improved corrosion resistance etc, this is an accepted fact. Traditional gear hardening heat treatment process has surface chemistry, surface induction surface hardening and flame hardening, etc., but these methods has some shortcomings: large and easy to handle after deformation along the tooth profile to obtain uniform distribution of hardened layer. Laser hardened materials because not only has quenched grain refinement, dislocation density, and can be precisely controlled heat treatment area, a small thermal deformation of the workpiece after processing, can be effectively used gear quenching. Laser cladding, also known as laser cladding or laser deposition, surface modification technology is an important method, which is the use of high-energy laser beam (104-106W/cm2) irradiation on the metal surface by the rapid melting, expansion and rapid solidification, the cooling rate usually reach 102-104 ℃ / s, the substrate surface cladding layer has a special physical, chemical or mechanical properties of materials, which constitute a new kind of composite materials, to compensate for the missing body of high-performance This composite material can give full play the advantages of both, to make up for each other's deficiencies. For some of the eutectic alloy, and can even be amorphous surface with excellent corrosion resistance. The skillful foreign expert of green laser pointer is in the workshop of 200mw laser pointer.
Laser cladding conditions according to the requirements of the workpiece, cladding of various design elements of metal or non-metallic, preparation heat, corrosion, abrasion, anti-oxidation, anti-fatigue, or with optical, electrical, magnetic properties of the surface coating . And commonly used in industrial welding, thermal spray and plasma spray, etc., laser cladding has the following advantages: cladding heat-affected zone is small, the workpiece deformation, high yield cladding; coated fine grain size, compact structure Therefore, its hardness is generally relatively high resistance to abrasion, corrosion-resistant performance is relatively good; short duration of action due to the laser (ns level), low dilution of the cladding layer, the substrate smaller than the melting of the cladding layer dilution rate is relatively low (normal is 5% -8%) of the cladding layer is thin in the case, to obtain the required composition and performance, thus saving expensive cladding materials; up to 106 ℃ / s cooling rate the solidification structure refinement, and even the performance of the organizational structure of the new ultra-dispersed phase, amorphous equal; laser cladding process is easy to automate production, and the coating quality and stability. The skilled expert of green laser pointer is guiding the worker to repair this kind of green laser pointer.