Use ultrasonic testing equipment to test the metal hardened layer of carbon steel gears with different thicknesses. Set the sampling frequency of the high-speed acquisition card to 50MHz. Adjust the ultrasonic parameters of the testing signal to obtain the original ultrasonic pulse signals with different thicknesses. The time domain...
According to the formula, the nonlinear ultrasonic coefficients of different samples are calculated according to the amplitude of the fundamental wave and the second harmonic wave. The amplitude of fundamental wave and second harmonic of carbon steel gears with different hardened layer thicknesses are shown in the table. It...
SAE J403 steel is a high-quality carbon structural steel with good strength, hardness, toughness and other material properties. Therefore, it has a wide range of applications. In the production process of automotive electronic parking gear, in order to improve the steel, hardness, wear resistance, fatigue strength and other material...
Among the introduced steel grades of the driving and driven gears of the rear axle, there are mainly Ni Cr Mo, Cr Mo and ZF series safa320h, 21nicrmo5h, ZF7, SCM 822h and other steels. After heat treatment, Ni Cr Mo series gear steel has high strength, good toughness, strong...
In view of the differences of resources and production process conditions in various countries, the gear steel alloy series used are different. For example, Germany adopts Mn CR series (16MnCr5, 20m ncr5, 25mncr5, 27mncr5); Scm-420r and h-420m series are adopted in Japan; The United States adopts Cr Ni Mo...
Automobile Carburized Gear Steel is mainly low-carbon alloy steel. With the development of automobile industry, low-alloy carburized steel with similar composition is gradually adopted for automobile gear steel in various countries, and is developing in the direction of high performance, long life, economy and productivity. Automobile Carburized Gear Steel...
With the automation of automobile gear processing line, in order to continuously improve production efficiency, many countries are studying the use of lead containing free cutting steel for automobile gears. Japan has been developing lead containing steel refining technology based on new ladle refining and vacuum degassing treatment, so...
Austenite grain size is of great significance to stabilize the hardenability of steel, reduce the deformation of automobile gear after heat treatment and improve the brittle fracture resistance of carburized steel. Because the coarse grain in automobile gear steel increases the carbon concentration of carburized layer, which leads to...
The purity requirement of automobile gear steel mainly refers to the inclusion of oxides and sulfides and the reduction of the content of harmful elements such as N, h, O and s. The inclusions in steel significantly reduce the fatigue performance of gears, especially the contact fatigue strength of...
In addition to the general requirements of strength, plasticity and toughness of engineering materials, the performance requirements of automobile gear steel also require three basic characteristics, namely specific hardenability, narrow hardenability bandwidth, high purity and fine grain size. In addition, good machinability is also an important index concerned by...