Forging to metal organization and performance

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Forging production, besides must ensure that forging the required shape and size outside, still must meet parts in use process proposed performance requirements, which mainly includes: strength pointer, plastic pointer, impact toughness and fatigue strength, fractur e toughness and resistance to stress corrosion performance, to the high temperature working parts, and high temperature instantaneous tensile properties, lasting performance, creep resistance and thermal fatigue property, etc. Forging quality raw materials are casting, rolling and extrusion materials and forging blank. And mill bar, crowded bar and forging blank respectively is casting by rolling, extrusion and forging processing of semi-finished products formed. Forging production, using reasonable technology and process parameters, can pass the following several aspects to improve the microstructure and the properties of raw materials:roller ball bearing
1) broken columnar crystal, improve macro segregation, the cast structure into forging state organization, and in the appropriate temperature and stress conditions, welded internal pore, improve the material density;
2) ingot after forging form ation of fibrous tissue, further through the rolling, extrusion, die forging, make the forging get reasonable fiber direction distribution;
3) control grain size and uniformity;special bearings
4) improve the second phase (for example: ledeburite steel of alloy carbide) distribution;
5), make the organization get deformation strengthening or deformation - phase transformation strengthening, etc. Due to the improvement of the organization, forging plasticity, impact toughness and fatigue strength and lasting properties will be improved, and then through the end of the parts heat treatment can get parts required hardness, strength and plasticity and good comprehensive performance. However, if the raw material quality bad or the forging process is not reasonable, it may produce forging defects, including surface defect, internal defects or performance not qualified, etc.precision bearing