Bearing six common quality defects after heat treatment

Bearing used as mechanical equipment, precision parts quality performance will directly affect the mechanical equipment performance, so we in the use of bearings, must according to the performance requirements, therefore a lot of manufacturers in order to improve the bearing performance, and heat treatment process is adopted to improve, but after the heat treatment process bearing often arise six major quality defects. 1, overheating from the mouth of the bearing parts rough can observe the microstructure after quenching overheat. But exactly judge the degree of superheat must observe the microstructure. If appear in GCr15 steel quenching organization coarse acicular martensite, organization for quenching overheating. Reasons may be the high quenching heating temperature or heat insulation time is too long cause of overheating; Also may be due to the original organization banded carbide, low carbon zone between two belts forming local martensite acicular bulky, cause local overheating. Overheating in the organization retained austenite increase, dimension stability. Overheating due to quenching organization, steel crystal bulky, to cause a decline in parts of toughness, impact resistance is reduced, the service life of bearing is also reduced. Serious overheating may even cause the quenching crack. 2, owe the quenching temperature is low or poor cooling will generate more than standard stipulated in the microstructure of austenite organization, called owe hot organization, it decreased the hardness, wear resistance reduced sharply, affect the bearing life. 3, the quenching crack bearing parts during the process of hardening cooling by internal stress of crack according to quenching crack. Of the cause of the crack are: due to quenching heating temperature is too high or cooling, the thermal stress and quality of metal volume change of the organization stress is greater than the fracture strength of steel; The original defects on the surface of the work ( Such as surface microcrack or scratches) Or steel internal defects ( The non-metallic inclusions such as slag, serious, white spots, shrinkage residual, etc. ) When quenching form stress concentration; Serious surface decarbonization and carbide segregation; Parts hardening after tempering lack or not timely temper; The previous process caused by salt stress, cold forging folding, deep turning tool and the oil groove sharp edges, etc. In conclusion, the causes of quenching crack could be one or more of the above factors, the existence of internal stress is the main reason for the formation of quenching cracks. Quenching crack deep and long, fracture surface is flat, the broken section without oxidation color. It is often a longitudinal straight on bearing ring crack or annular crack; On the bearing steel ball shape with s-shaped, T or ring. Is the quenching crack groups on both sides without decarburization phenomenon of crack, the obvious difference with forging cracks and crack materials. 4 during heat treatment, heat treatment deformation of bearing parts, there is the thermal stress and organization stress, the internal stress can overlay or partially offset each other, is complex and changeable, because it can as the heating temperature, heating rate, cooling, cooling speed, parts of the change of the shape and size changes, so the heat treatment deformation is inevitable. Know and grasp its change law can make the deformation of the bearing parts, Such as ring elliptic, large size up, etc. ) In the scope of the controllable, be helpful for production. , of course, in the process of heat treatment, mechanical collision also can make parts deformation, but the deformation is can be used to improve operation to reduce or avoid. 5, decarburization on the surface of bearing parts in the process of heat treatment, if they are in oxidizing medium heat, surface oxidation happens to make the surface of carbon mass fraction decreases, causing surface decarburization. The depth of the surface decarburization layer than machining allowance will make the parts scrap. The determination of surface decarburization layer depth is available in the metallographic examination metallography and microhardness method. The surface microhardness distribution curve measurement shall prevail, to do the arbitration criterion. 6, soft point caused by a lack of heating, cooling and quenching causes such as improper operation of the surface of the bearing parts local hardness insufficient phenomenon known as quenching soft point. It is like decarburization on the surface of the sample can cause surface wear resistance and fatigue strength of serious decline. Tags: bearing heat treatment