(1) Castability Refers to the metal material can be use […]
Refers to the metal material can be used to obtain the performance of qualified castings by casting. Castability mainly includes fluidity, shrinkage and segregation. Fluidity refers to the ability of a liquid metal to fill a mold. Shrinkage refers to the degree of volume shrinkage when the casting solidifies; segregation refers to the non-uniformity of chemical composition and structure of the metal due to the difference in crystallization between the metals during cooling and solidification.
Refers to the ability of metal materials to change shape without cracking during press working. It can be processed in the liquid or cold state for casting, rolling, drawing, extrusion, etc. The forgeability is mainly related to the chemical composition of the metal material.
(3) Machinability (cuttability)
Refers to the ease with which a metal material is machined and becomes a qualified workpiece. The machinability is usually measured by the surface roughness of the workpiece after processing, the allowable cutting speed and the degree of wear of the tool. It is related to many factors such as the chemical composition, mechanical properties, thermal conductivity and degree of work hardening of the metal material, usually Hardness and toughness are roughly cut off for good machinability. Generally speaking, the higher the hardness of the metal material, the harder it is to cut; the hardness is not high, but the toughness is large and the cutting is difficult.
Refers to the adaptability of metal materials to welding processing. Mainly refers to the difficulty of obtaining high-quality welded joints under certain welding process conditions. It includes two aspects: First, the combined performance, that is, the sensitivity of a certain metal to form a welding defect under certain welding process conditions; the second is the use performance, that is, under certain welding process conditions. The suitability of certain metal welded joints for the requirements of use.