The principle of the heat treatment process of material selection
1) required to meet the requirements of the most basic principles of material selection, generally include: (1) strength requirements; (2) the stiffness requirements; (3) wear; (4) vibration; (5) temperature; (6) corrosion factor. But not meet these requirements, depending on the principal contradiction. When the intensity of the main requirements, the choice of high strength materials more expensive, or choose a lower strength materials, to increase the size of the part;
When the heat is the main requirement, the choice of good and expensive heat-resistant materials, and sometimes the choice of material of poor heat resistance, additionally cooling measures.
2) The manufacturing process requires the manufacturing process on the part of the cost plays a very important role. General requirements of the selected material should be processed in line with the quality requirements of the parts to simple methods.
More complex shape parts, large size, with forging difficult to achieve. In this case it must be cast or welded parts, thereby casting of the material presented, weldability requirements.
Heat treatment process has a great influence on the strength properties of the parts. The same structure and materials, if the use of reasonable heat treatment process, the strength of the performance can increase exponentially. What is the use of heat treatment process, it often depends on the strength of the parts of the requirements, what kind of material, but also must consider what kind of heat treatment process, there is a close relationship between them. For parts subject to varying stress and shock loads, this problem can not be ignored, especially.
3) economy requires first performance of the economy relative prices of materials. In part to meet the requirements of the premise, as far as possible to select inexpensive materials. It should be noted that when the parts is far greater than the proportion of material processing fees and time-consuming, election material factors will not consider relative prices but its processing performance. Although sometimes we use a higher material prices, but due to simple processing, reduced overall dimensions and weight, but reduce the cost of machinery. Such as the production of a small amount of complex shape mainframe seat, the use of rolled steel weldments will cost less than the casting.
4) Anti-corrosion requirements.
