Analysis Of Cutting Effect Of Austenitic Stainless Steel Parts Processing Progress

Austenitic stainless steel is stainless, non-magnetic and plastic. It is a single austenitic structure at room temperature. It has low strength and no phase transformation during heating and cooling. It cannot be strengthened by phase transformation. At present, it can only be deformed. It is one of the materials that are more difficult to cut. How do we process this austenitic stainless steel part? Mainly by improving cutting parameters, optimizing cutting tools and cutting methods. The specific analysis is as follows:

Factors affecting machinability

The difficulty of processing stainless steel parts for data cutting is often called machinability. Good machinability refers to high tool durability (life). The material's hardness, ductility, work hardening, thermal conductivity and abrasiveness and other physical and mechanical performance indicators determine the machinability of the material. The relationship is with the progress of hardness, ductility, work hardening, thermal conductivity and abrasiveness. , The machinability of data is on a downward trend. The chemical composition and metallographic arrangement of the material are the basis for determining its physical and mechanical properties.

Austenitic stainless steel has poor thermal conductivity, low hardness, and good ductility (elongation δ>40%, reduction of area Ψ>60%). During cold working, work hardening occurs due to the generalized effects of carbide second phase particle strengthening and strain-induced transformation strengthening [78], and its strength can be increased from σb≈539MPa to σb≈1568MPa.

Stainless steel parts processing

Austenitic stainless steel parts are highly abrasive. The abrasiveness of the data refers to the ability of hard points such as carbides to wear to the tool during the cutting process. In Zigui, carbides mainly exist in the form of (Fe, Cr) 23C6 and TiC hard spots (TiC hardness 3200HV). These hard points draw grooves on the surface of the tool during the cutting process, resulting in mechanical wear of the tool, and hard point wear or abrasive wear occurs. This is a common way of cutting tool wear. Tool life is a function of the carbide size and the number of carbides per unit area. For a given chemical composition, when the size of carbide increases and the number decreases, the life of the tool obviously extends.

Ways to Improve Data Machinability

In view of the material composition and the characteristics of the austenite arrangement, efforts to improve its machinability can start from improving the amount of carbides in its metallographic arrangement:

①Reduce the number of carbides, reduce the strengthening effect of the second phase carbide particles, and improve the work hardening of materials;

②Reduce the hard spots of carbide and reduce the abrasiveness of materials. The solution treatment method can just achieve this purpose.