How do you calibrate the polariser of a polarisation microscope?
Usually casting material properties (such as its strength, toughness, magnetism, corrosion and other mechanical, physical, chemical properties) is dependent on its internal organisation (including atoms and atoms in the lattice and neighbouring atoms combined way, molecules, and microstructure, grain shape and size, etc.), and these properties in the casting when used to present is the role / utility (such as high-strength casting, fast-cutting casting, corrosion casting, heat-resistant casting, wear-resistant casting, etc.), to manufacture and use the casting must understand its organisation, casting material must be processed into a special purpose to meet the design requirements of the casting. castings, wear-resistant castings, etc.), to manufacture and use the castings must understand its organisation, casting materials must be treated as special purpose to meet the design requirements of the castings. In order to improve the performance of the casting, it is necessary to make appropriate changes to its internal organisation. If the treatment method changes the organisation, the performance of the material will also change. In the manufacturing process, changing the internal organisation of the casting will also change the properties of the material and its function in use. Heat treatment is a typical application of this.
From the above description, the casting heat treatment can be defined as follows:
Castings under control by heating, holding temperature and cooling process, and change the internal organisation of the material, in order to enhance the mechanical properties of the castings or to achieve the special purpose of the use of the casting, the casting of the heating rate, holding temperature and holding time and cooling rate of the relationship between the casting by heat treatment can be expected to obtain the casting performance. The basis of any heat treatment programme includes the following four basic considerations:
First, the heating rate
Selection of the appropriate holding temperature
Third, the holding time at the holding temperature
Cooling rate
