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Cause Analysis of Early Failure of Bearing
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| Time：2016.11.15 News Sources：Shandong Xinkaite bearing Co.,Ltd. Views：
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Microscopic analysis of the most commonly used, the most popular method is fracture analysis, optical metallographic analysis and hardness testing. The analysis should include:
(1) whether the raw materials meet the standards and design requirements.
(2) bearing parts of the matrix organization and heat treatment quality is in line with standard requirements.
(3) the existence of surface layer decarburization layer, and the other surface processing of metamorphic layer.
(4) Measure the depth of the surface hardening layer and multi-layer metal layer, the shape and depth of the corrosion pits or cracks, and determine the cause and nature of the crack according to the shape of the defect and the two sides of the organization.
(5) According to the grain size, deformation, local transformation, recrystallization, phase aggregation to determine the degree of deformation, temperature, material types and process.
(6) to measure the surface hardness, hardness of the matrix, hardness uniformity and failure of the hardness of the characteristic area changes.
(7) fracture observation and analysis. Scanning electron microscope has many advantages, such as large depth of field, high magnification and clear image, so it is superior to observation and characterization of fracture.
(8) electron microscopy, probe and electron spectroscopy in the fatigue source and crack source analysis can measure the fracture of foreign body composition, found the nature of the fracture and fracture reasons.
From the surface, or from the surface layer of cracks, the two objectives (parts carburizing, quenching and other surface heat treatment, if there is uneven hardness, the organization, and non-uniform internal stress and other adverse, the contact stress is generally Is produced from the opposite under the influence of underground cracks, if the part surface quality is poor, there is a defect (oxidation, decarburization), friction or poor lubrication from surface cracks.
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