Annealing heat treatment (1)

Source: China Bearing Network Time: 2014-10-31

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There are several types of bearing steel annealing: dispersion annealing, stress relief annealing and spheroidizing annealing. The annealing of bearing ring forgings should use spheroidizing annealing. Spheroidizing annealing makes the arrangement into uniform dispersed fine-grained pearlite; Supply the best original arrangement, improve plasticity; reduce hardness; facilitate cutting.
1. The effect of pearlite shape and size distribution on function Pearlite is a mixture of ferrite and cementite; its carbon content is 0.8%. If the cementite in the pearlite exists in the form of flakes; Pearlite. After the spheroidal pearlite is spheroidized and annealed; the cementite is spherical; this is called spherical pearlite. The annealing of GCr15 bearing steel is to obtain this spherical pearlite arrangement, and the requirement is fine and uniform. The effect of the fine-grained, pearlite shape and the fine-grained dispersion on the processing function can be discussed from the following conditions:
(1) Uniform fine-grained pearlite; heat treatment temperature ratio is wider than coarse-grained, flake-like, and coarse-grained pearlite; temperature is simple to control, and plasticity is good; cutting resistance. Xing Xingyong.
(2) Uniformly dispersed granular pearlite suitable for scale; provides excellent arrangement for quenching in the future; makes the quenching temperature wide; the martensite arrangement after quenching is fine and uniform; it is not easy to overheat and soft spots 2. Make an outstanding foundation for the quality of the progressive bearing.
(3) If the original arrangement before quenching is coarse-grained, flake-like and coarse-grained pearlite; its superheat sensitivity is high; heating temperature is difficult to handle; uneven arrangement after quenching; easy deformation and cracking of workpiece; mechanical function Low quality, other; flaky pearlite hardness is higher than spherical pearlite; poor plasticity; large cutting resistance; cutting is not easy to separate; increase the roughness R _{a of the} processing surface. The machining accuracy of the parts is difficult to ensure; The original arrangement must be re-annealed after normalizing.

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