Process parameters and superplasticity indexes of seven kinds of high-speed steels during superplastic tension and compression deformation

7 High Speed Steel Supersonic Plastic Stretching and Compression Deformation Processing Parameters and Supersonic Plasticity Indicators

High speed steel is a type of alloy steel made up of iron and other alloying elements such as cobalt, molybdenum, tungsten and chromium. The main purpose of alloying high speed steel is to increase its wear and abrasion resistance, as well as its ability to retain a sharp cutting edge. High speed steel has a high level of heat resistance and is often used in the manufacture of cutting tools, such as drill bits and blades.

The main purpose of supersonic plastic stretching and compression deformation of high speed steel is to enhance its mechanical properties. The process involves the simultaneous application of high-frequency and high-strain force on a steel bar, causing it to deform plastically and resulting in a fine grain structure. This process can be done either cold or hot depending on the amount of strain and temperature needed to achieve the desired effects. The plasticity indices of the material are then evaluated in order to measure the effectiveness of the deformation process and determine its suitability for use in engineering applications.

When undertaking supersonic plastic stretching and compression deformation of high speed steel, several processing parameters must be taken into consideration in order to achieve the best results. These include the speed at which the steel bar is subjected to the force, the amount of strain, the temperature, the holding time and the type of die and tooling used. The speed of the process is often determined by the hardness of the steel being stretched, as softer materials will require lower speeds. The amount of strain applied is also important, as too much or too little can lead to cracking or excessive deformation of the material.

Temperature is also a major factor, and must be controlled carefully in order to achieve the desired plasticity index. A higher temperature will result in greater plasticity, but too high of a temperature can lead to excessive deformation which can negatively impact the mechanical properties of the material. Holding time refers to the amount of time that the steel bar is subjected to the force before being released, and this will also affect the plasticity index of the material. The type of die and tooling used must also be taken into consideration; each die and tooling will have a different effect on the mechanical properties of the material.

Supersonic plasticity indices are used to measure the effectiveness of the supersonic plastic stretching and compression deformation process. These can include yield strength, which is a measure of how much strain the material can take before it begins to flow or show plastic deformation; ultimate tensile strength, which measures the maximum stress that the steel can take before it reaches its maximum strength; and ductility, which is a measure of the amount of strain the material can take before it fractures. Other indices include hardness, impact strength and fatigue strength. All of these indices are important in determining the suitability of high speed steel for use in a number of engineering applications.

In conclusion, when undertaking supersonic plastic stretching and compression deformation of high speed steel, there are a number of processing parameters that must be considered. These include the speed at which the steel bar is subjected to the force, the amount of strain, the temperature, the holding time and the type of die and tooling used. In order to measure the effectiveness of the process, supersonic plasticity indices such as yield strength, ultimate tensile strength, ductility, hardness, impact strength and fatigue strength must also be taken into consideration.

Superplasticity is a term used to describe materials that are deformable without breaking as normal metals would. Fast steels are some of the most commonly used superplastic materials, but there are seven types of them, each with its own set of process parameters and superplasticity indices.

The first type is 15CrNi6. This has a typical process parameters of hot rolling temperature of 980°C, a 14% reduction and a strain rate of 0.1-2s-1. Its superplasticity indices can be as high as 40%.

The second type is 17CrNiMo6. It has similar process parameters of hot rolling temperature of 980℃, a 15% reduction and a strain rate of 0.2-2s-1. Its superplasticity indices can be as high as 50%.

The third type is 20CrNi2Mo2. Its process parameters include hot rolling temperature of 980℃, a 12% reduction and a strain rate of 0.2-2s-1. Its superplasticity indices can be as high as 45%.

The fourth type is 20CrMnTiH. Its process parameters include hot rolling temperature of 900°C, a 18% reduction and a strain rate of 0.2-2s-1. Its superplasticity indices can be as high as 30%.

The fifth type is 23CrNiMo14. Its process parameters include hot rolling temperature of 980℃, a 15% reduction and a strain rate of 0.2-2s-1. Its superplasticity indices can be as high as 40%.

The sixth type is 31CrNiMo14. Its process parameters include hot rolling temperature of 980°C, a 14% reduction and a strain rate of 0.2-2s-1. Its superplasticity indices can be as high as 35%.

The seventh type is 34CrNiMo14. Its process parameters include hot rolling temperature of 980°C, a 15% reduction and a strain rate of 0.2-2s-1. Its superplasticity indices can be as high as 35%.

In conclusion, the seven types of fast steels generally have similar process parameters like hot rolling temperature, reduction and strain rate. However, their superplasticity indices vary significantly.