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Prevention and control of casting defects
Casting defects are the main cause of waste and a serious threat to the quality of castings. Due to various reasons, the defects existing in castings vary widely. Due to the difference in conditions during solidification, the types of defects are different in shape and performance. For example, the solidification shrinkage of liquid metal will form shrinkage and shrinkage; the redistribution of elements in the solid phase and the liquid phase during solidification will cause segregation; the concentration of thermal stress during cooling will cause cracks and deformation of the casting. Depending on the cause and degree of occurrence, appropriate measures should be taken to control it to eliminate or minimize it. In addition, there are many defects, such as inclusions, pores, cold partitions, etc., which occur in the filling process, which are not only related to the type of alloy, but also related to the specific forming process. In short, preventing, eliminating and controlling various types of defects is a key issue that cannot be ignored.