Laser surface hardening and heat treatment technology is a new material surface treatment technology developed in the past 20 years. The principle of laser surface enhancement technology is to use the characteristics of extremely strong laser penetration ability. When the metal surface is heated to a critical transition temperature just below the melting point, the surface of the surface is austenitized quickly, then rapidly quenched and quenched, and the metal surface rapidly. Strengthened.
Laser surface hardening and heat treatment can be divided into three categories: First, the metal does not melt when laser irradiation, but the organization changes, this type of process is mainly laser transformation hardening (laser quenching); Second, the metal melts after laser irradiation, cooling after the organization Change or addition of other elements to improve the surface properties, including laser fusion, laser alloying, laser amorphization and microcrystallization; Third, the metal surface is vaporized during laser irradiation, resulting in changes in the organization, such processes are mainly laser Impact hardening. The common theoretical basis for the various laser heat treatment processes described above is the interaction between the laser and the material and its metallurgical behavior.
Laser heat treatment is the development and supplement of traditional heat treatment technology. It can solve the problem of material strengthening that other surface treatment methods cannot solve or can not be solved. After the laser treatment, the surface layer strength of the cast layer can reach HRC60 or more, and the surface layer hardness of medium carbon, high carbon steel and alloy steel can reach HRC70 or more, thereby improving its wear resistance, fatigue resistance, corrosion resistance, oxidation resistance, etc. Service life.
Laser heat treatment is widely used in the automotive industry. HJ laser heat treatment can be applied to many key parts of the vehicle (such as cylinder block, crankshaft, camshaft, exhaust valve, valve seat or piston ring). Similarly, agricultural locomotives should also be widely used. In agricultural production, the working conditions of the machine are varied, and some machines (ploughs, cultivators, seeders and harvesters) work directly in the abrasive medium, causing many parts to wear quickly. On the other hand, in order to obtain sufficient strength, the amount of material used in the machine is large, which not only wastes material, but also becomes cumbersome. For such parts, the hardness after laser hardening is 5% to 20% higher than that of conventional quenching. Laser alloying can be based on the requirements to select new materials to form a new alloy layer based on the substrate to obtain satisfactory performance. In addition, because of the improved performance after processing, lower performance substrates can be selected, thereby reducing the quality of the substrate.
Laser surface hardening and heat treatment can be divided into three categories: First, the metal does not melt when laser irradiation, but the organization changes, this type of process is mainly laser transformation hardening (laser quenching); Second, the metal melts after laser irradiation, cooling after the organization Change or addition of other elements to improve the surface properties, including laser fusion, laser alloying, laser amorphization and microcrystallization; Third, the metal surface is vaporized during laser irradiation, resulting in changes in the organization, such processes are mainly laser Impact hardening. The common theoretical basis for the various laser heat treatment processes described above is the interaction between the laser and the material and its metallurgical behavior.
Laser heat treatment is the development and supplement of traditional heat treatment technology. It can solve the problem of material strengthening that other surface treatment methods cannot solve or can not be solved. After the laser treatment, the surface layer strength of the cast layer can reach HRC60 or more, and the surface layer hardness of medium carbon, high carbon steel and alloy steel can reach HRC70 or more, thereby improving its wear resistance, fatigue resistance, corrosion resistance, oxidation resistance, etc. Service life.
Laser heat treatment is widely used in the automotive industry. HJ laser heat treatment can be applied to many key parts of the vehicle (such as cylinder block, crankshaft, camshaft, exhaust valve, valve seat or piston ring). Similarly, agricultural locomotives should also be widely used. In agricultural production, the working conditions of the machine are varied, and some machines (ploughs, cultivators, seeders and harvesters) work directly in the abrasive medium, causing many parts to wear quickly. On the other hand, in order to obtain sufficient strength, the amount of material used in the machine is large, which not only wastes material, but also becomes cumbersome. For such parts, the hardness after laser hardening is 5% to 20% higher than that of conventional quenching. Laser alloying can be based on the requirements to select new materials to form a new alloy layer based on the substrate to obtain satisfactory performance. In addition, because of the improved performance after processing, lower performance substrates can be selected, thereby reducing the quality of the substrate.
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