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The laser quenching technology is a process of rapidly heating the surface of a steel material by using a focused laser beam to cause a phase transformation to form a martensitic hardened layer. Laser quenching has a high power density, a fast cooling rate, and does not require a cooling medium such as water or oil. It is a clean and fast quenching process.
Compared with induction quenching, flame quenching and carburizing quenching, the laser quenching hardening layer is uniform, the hardness is high (generally 1-3HRC higher than induction quenching), the workpiece deformation is small, the heating layer depth and heating trajectory are easy to control, and it is easy to automate. It is not necessary to design corresponding induction coils according to different part sizes like induction hardening. The processing of large parts does not need to be limited by the size of the furnace during chemical heat treatment such as carburizing and quenching, so it is gradually replacing induction hardening and chemistry in many industrial fields. Traditional processes such as heat treatment. It is especially important that the deformation of the workpiece before and after laser quenching is almost negligible, so it is particularly suitable for surface treatment of parts with high precision requirements. The depth of the laser hardened layer is generally in the range of 0.3 to 2.0 mm depending on the composition, size and shape of the part and the laser process parameters.
The tooth surface of the large gear and the journal of the large shaft parts are quenched, the surface roughness is basically unchanged, and the need of subsequent machining can meet the requirements of the actual working condition. Laser condensing and quenching technology is a process in which the surface of the substrate is heated to a melting temperature by using a laser beam, and the surface of the molten layer is rapidly cooled and solidified by the heat conduction cooling inside the substrate. The obtained fused and quenched structure is very dense, and the microstructure in the depth direction is a melt-solidified layer, a phase change hardened layer, a heat affected zone, and a substrate. The laser fused layer has a deeper depth of hardening than the laser quenched layer, higher hardness, and better wear resistance. The shortcoming of this technology is that the roughness of the surface of the workpiece is damaged to a certain extent, and generally requires subsequent machining to recover. In order to reduce the roughness of the surface of the parts after laser fused treatment and reduce the amount of subsequent processing, Huazhong University of Science and Technology has prepared a special laser fused quenching coating, which can greatly reduce the surface roughness of the fused layer.
Nowadays, the workpieces such as rolls and guides of various materials in the metallurgical industry, which are laser-melted, have surface roughness close to the level of laser quenching. Laser quenching has been successfully applied to the surface strengthening of wearing parts in the metallurgical industry, machinery industry and petrochemical industry, especially in improving the service life of wearing parts such as rolls, guides, gears and cutting edges. , achieved great economic and social benefits. In recent years, it has become more and more widely used in the surface strengthening of parts such as molds and gears.
Laser quenching characteristics
Quality advantage Technical characteristics Applicable materials practical application
1. Quenched parts are not deformed by laser quenching. The thermal cycle process is fast medium carbon steel large shaft type 2. Almost no damage to the surface roughness using anti-oxidation protection thin coating die steel various molds 3. Laser quenching, non-cracking, accurate quantification, numerical control quenching, cold work die, steel die, cutting tool 4. Carbon steel steel shock absorber for numerically controlled quenching of local, groove and groove quenching. Laser quenching, high efficiency, no need for water or oil, etc.
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