20CrMnMo, executive standard: GB/T3077-1999
20CrMnMo is a grade of alloy structural steel. Unified digital code: A34202.
In order to better explore the laser heat treatment process of 20CrMnMo transmission gear, the finite element and laser heat treatment tests of heat treatment process were carried out. Firstly, the finite element analysis model of the whole process of laser heat treatment is created, and the surface utility module is added to the 3D solid model of the transmission gear. Then, according to the manual method and APDL language two methods to release the load. Finally, the continuous fitness motion of the laser speckle and its temperature gradient spread along the radial and deep orientation of the journal were simulated, and the temperature curves of the nodes along the management center plane and deep orientation over time were obtained, which has a key guiding role for the basic parameters of the laser heat treatment process.
On the other hand, after nitriding, 20CrMnMo transmission gear was produced and processed according to laser heat treatment, and the dental surface with different strength values was obtained, and the three main parameters of laser output power, scanner speed and spot diameter were integrated to carry out experimental scientific research. The typical surface layer of the tooth was made into samples and scientific research was carried out according to SEM, and the hard base layer was accurately measured according to stereomicroscope. Very good agreement was found between simulation and test results. The results of scientific research show that the best main parameters for laser heat treatment of 20CrMnMo transmission gears are as follows: The output power of the laser is found to be very good in the simulation and test results.
The results of scientific research show that the best main parameters for laser heat treatment of 20CrMnMo transmission gears are as follows: The output power of the laser is found to be very good in the simulation and test results. The results of scientific research show that the best main parameters for laser heat treatment of 20CrMnMo transmission gear are as follows: laser output power P = 2300W, scanner speed v = 750Mm/min, spot diameter d = 14mm; The maximum strength of the dental surface is 61.4HRC, and the microscopic mechanism is a high-density fibrous and plate martensite with a crystal size of about 9°. The deep layer of the equivalent circuit hardbase is 1.8mm or more.
20CrMnMo Key features
High toughness emergency nitriding steel. The compressive strength is higher than 15CrMnMo, the plastic deformation and ductility are slightly lower, the cutting performance and physical properties are higher than 20CrMnTi, and the heat treatment after ultra-low temperature quenching has excellent comprehensive physical properties and ultra-low temperature impact toughness. Nitriding heat treatment has high tensile strength and wear resistance, but it is easy to cause cracks when cutting. Electric welding weldability is not good, suitable for resistor welding, welding before heating, welding after quenching solution. Excellent drilling performance and heat treatment.
20CrMnMo is a type of alloy tool steel required by national industry standards, and is a high-toughness nitriding steel.
The nitriding heat treatment process is carried out first, and then the heat treatment temperature is 850℃ and the oil is cooled. 200℃ quenching, air cooling. Excellent comprehensive physical properties and ultra-low temperature impact toughness after heat treatment and quenching; High tensile strength and wear resistance after nitriding heat treatment. Commonly used in the production of high toughness, high toughness, high wear resistance of the key nitriding parts, such as engine crankshaft, engine camshaft, crankshaft, shaft sleeve, transmission gear, shaft pin and so on. When the strength is high after nitriding heat treatment, it is easy to cause cracks when cutting.
