Early failure forms of self-aligning roller bearing

Wafangdian spherical roller bearing Bearing - comfortable and durable Talking with you on July 1, the author: early failure mode of the spherical roller bearing, mainly include: fracture, plastic deformation, wear, corrosion, fatigue under normal conditions the main contact fatigue is the main internal factors: hardness, strength, toughness, wear resistance, corrosion resistance, internal stress state ( The service condition) Early failure mode of the spherical roller bearing: the martensite hardened steel high carbon chromium steel original organization: granular pearlite quenching + tempering at low temperature, quenching martensite M in carbon content, significantly influence the mechanical properties of the steel GCr15 steel quenching M carbon content is 0. 5% ~ 0. 56% can be obtained the comprehensive mechanics performance of the strongest ability to resist failure. M: cryptocrystalline martensite, measured carbon content is average carbon content. Early failure mode of the spherical roller bearing, the retained austenite in high carbon chromium steel quenching steel after normal quenching can contain 8% ~ 20% Ar ( Retained austenite) 。 Ar has both advantages and disadvantages of bearing parts, Ar content should be appropriate. 基于“增大化现实”技术的% ↑ Hardness and contact fatigue life with increased to peak and then subsequently and reduce the effect of Ar Ar to be in a stable state, if the spontaneous into martensite, will make the steel toughness reduced sharply and embrittlement. Bearing load is small: Ar a small amount of deformation occurs, both to reduce the stress peak, and has the deformation Ar processing reinforcement and stress and strain induced martensite phase transformation and reinforcement, Ar increased to reduce the influence of the bearing contact fatigue life under load is larger: Ar larger plastic deformation local stress concentration and fracture and matrix, and thus reduce the life of spherical roller bearing early failure forms: not dissolve carbide of hardened steel quenching is not the amount of dissolved carbon in steel, morphology, size and distribution of steel chemical composition and the influence of the original before quenching organization affected by austenitizing conditions. Bearing ( And are especially carbide spherical) With matrix cause stress concentration and crack, which would reduce the toughness and fatigue resistance. Quenching not dissolve carbide affect the performance of the steel quenching the carbon content of martensite and Ar content and distribution, thus additional impact on the performance of the steel. Quenching is not dissolved carbide too much on comprehensive mechanical properties of steel and failure resistance is harmful. Behind a few not dissolve carbide bearing steel quenching is necessary to obtain fine grain abrasion resistance cryptocrystalline martensite require not less soluble carbide ( Fewer) And small ( Small size) And well, Small size differences, and distributed evenly) , round ( Each grain of carbide spherical) 。 Properly reduce the carbon content of bearing steel is one of the ways to improve the service life of the parts. Early failure mode of the spherical roller bearing, the residual stress after quenching tempering after quenching temperature tempering the bearing parts, still has a large internal stress. As the increase of the surface residual compressive stress, fatigue strength is increased, Excessive residual stress may cause deformation of the parts) Residual internal stress is tensile stress on the surface, the lower the fatigue strength. Early failure mode of the spherical roller bearing, impurity content of impurities of steel, non-metallic inclusions and harmful elements ( Acid soluble) Such as oxygen content is higher, the more the oxide inclusions in steel material's influence on the mechanical properties and the ability to resist the failure parts and the type of impurities, nature, quantity, size, and shape usually have lower toughness and plasticity and the fatigue life for working under high stress of bearing parts, must be reduced with the oxygen content of the steel making exceptions: MnS inclusions in steel shape is elliptic ball to package the harm larger effect on the fatigue life of oxide inclusions reduced smaller may even be beneficial. Bearing comfortable and durable, )