Forging production, in addition to the shape and size must ensure that the forging requirements, but also must meet the parts in the course of the performance requirements, which include: strength pointer plastic pointer, impact toughness, fatigue strength, fracture toughnessand stress corrosion resistance of parts for high temperature work, the high temperature transient tensile properties, long-lasting performance, creep resistance and thermal fatigue performance.
The raw material for forging ingots, rolled products, extrusion material and Forging. While roll, squeeze the timber and the Forging of the ingot by rolling, extrusion and forging of semi-finished. Forging production, the use of rational processes and process parameters to improve the microstructure and properties of raw materials through the following aspects:
1) break the columnar grain and improve macro-segregation, the cast structure into a wrought-state organization, and under appropriate conditions of temperature and stress, welding the internal porosity and improve the density of the material;
2) ingot after forging the formation of fibrous tissue, and further by rolling, extrusion, forging, forging get the reasonable direction of the fiber distribution;
3) control grain size and uniformity;
4) to improve the second phase (for example: ledeburite distribution of alloy carbides);
5) to enable the organization to get the deformation strengthening or deformation - phase transformation strengthening.
Due to the improvement of the above organizations, the plasticity of the forging, impact toughness, fatigue strength and lasting performance also will be improved, and then through the final heat treatment of parts can get the parts required by good hardness, strength and plasticity properties.
However, if the poor quality of raw materials or used in the forging process is unreasonable, it may produce forging defects, including surface defects, internal defects or performance failed.
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