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Early failure modes of rolling bearings; primary cracking, plastic deformation, wear, corrosion and fatigue; under normal conditions, the first is fatigue. The failure of bearing parts is in addition to the conditions of service; the hardness, strength, durability and resistance of steel are the primary. Grinding, corrosion resistance and internal stress conditions are constrained. The main connotation factors affecting these functions and conditions are as follows. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
The original arrangement of the high-carbon chrome steel of the sorghum seedlings is granular pearlite; in the case of quenching low temperature tempering; the carbon content of the quenched martensite; significantly affects the mechanical function of the steel. The strength and the resistance are at 0. 5% or so; touch fatigue life is about 0.55%; anti-crush can be around 0.44%; when GCr15 steel quenching martensite carbon content is 0.5% to 0.56%; Obtaining the best resistance to failure can be the most inductive mechanical function.
It should be noted that the martensite obtained in this case is cryptocrystalline martensite; the measured carbon content is the uniform carbon content. In practice, the carbon content in the martensite is uneven in the microdomain. The concentration of carbon around the carbides is higher than that of the original ferrites away from the carbides; therefore, the temperature at which they start martensite transformation is different; then the growth of the martensite grains and the appearance of the microscopic shape are followed. It becomes cryptocrystalline martensite. It can prevent microcracks which are easy to appear when quenching high carbon steel; and its sub-layout is dislocation-type lath martensite with high strength and resistance. Therefore; only when high carbon steel When the medium carbon cryptocrystalline martensite is obtained during quenching, the bearing parts can achieve the best resistance to failure.
The glassy seedlings have a high rate of salty high carbon chromium steel after normal quenching; it can be rich in 8% to 20% Ar (residual austenite). Ar in bearing parts has advantages and disadvantages; It should be appropriate. Because the amount of Ar is mainly related to the austenitizing condition of quenching heating; how much it affects the carbon content of quenched martensite and the amount of undissolved carbide; it is difficult to correctly reflect the influence of Ar amount on mechanical function. For this purpose; fixed austenitic conditions; using austenite thermal stabilization treatment process; to obtain different amounts of Ar; here we studied the effect of Ar content on the hardness and touch fatigue life of GCr15 steel after quenching low temperature tempering Following the increase in austenite content; hardness and touch fatigue life are added; after reaching the peak, it decreases; but the peak Ar content is different; the hardness peak is around 17% Ar; The peak value of fatigue life is around 9%. When the experimental load is reduced, the effect of the increase in the amount of Ar on the fatigue life of the touch is reduced. This is because when the amount of Ar is small, the effect on the strength is small; The effect is more significant. The reason is that the load is more At the time of Ar; a few deformations of Ar; both the stress peaks are reduced; the deformed Ar processing strengthening and the stress-strain-induced martensitic transformation are strengthened. However, if the load is large, the larger plastic deformation of Ar and the basic understanding part The stress is gathered and cracked; then the life is reduced. It should be pointed out that the beneficial effect of Ar is necessary to be stable under Ar; if it is spontaneously transformed into martensite; the resistance of steel will be drastically reduced and embrittled.
. The quantity, description, size and dispersion of undissolved carbides in the quenched steel of the 慊鸶 慊鸶 奈 ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; The effect of undissolved carbides on the bearing life is less studied. Carbides are hard and brittle phases; in addition to the good wear resistance; the load will cause stress (especially the carbide is non-spherical) and the matrix will cause stress Cracks occur; then resistance and fatigue resistance are reduced. Quenching of undissolved carbides in addition to their own effects on the function of steel; also affects the carbon content and Ar content of the quenched martensite and the distribution; then the function of the steel Additional effects occur. In order to remind the effect of undissolved carbides on the function; choose steels with different carbon content; after quenching, the martensite carbon content is the same as the Ar content and the undissolved carbide content is different; After tempering at 150 °C; because martensite has the same carbon content; and the hardness is higher; therefore, a small increase in undissolved carbides has little increase in hardness; a crushing load reflecting strength and resistance is reduced; Sensitive Number touch fatigue life was significantly decreased. Thus quench excess undissolved carbides are summarized mechanical function and failure resistance of the steel is harmful. Properly decrease carbon bearing steel article is one of progress using several methods life.
Quenching of undissolved carbides has an effect on the data function; scale, tracing, and dispersion also affect the data function. In order to prevent damage to undissolved carbides in the bearing steel; less undissolved carbides are required (less quantity) Ç”å½ç¼§.(16)龋ù笮â€èˆœèˆœå—–詈嗖詈. 曳 龋 龋 (16) 玻 è“Ÿé”猿 Lè“Ÿé”猿 is endangered. It should be noted that there is a small amount of undissolved carbide after bearing steel quenching is necessary; Adhere to the wear resistance of the meet; and is also a necessary condition for obtaining fine-grained cryptocrystalline martensite.
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The bearing parts are quenched and tempered at low temperature; still have large internal stress. The residual internal stress in the parts has advantages and disadvantages. After the heat treatment of the steel parts; the residual compressive stress increases with the appearance; the fatigue strength of the steel follows Increase; when the internal stress of the external surface is tensile stress; the fatigue strength of the steel is reduced. This is because the fatigue failure of the part is presented when the excessive tensile stress is received; when the external compressive stress remains, it will offset the equality. The value of the tensile stress; and the practice of the steel to accept the tensile stress value minus. 蛊 @颓慷 拗翟龈撸 拗翟龈撸 ç »å¬— ç »å¬— ç »å¬— ç »å¬— 罄 罄 罄 罄 Σ Σ Σ åµŠæ°¤æƒºè‰¿ç¦ åµŠæ°¤æƒºè‰¿ç¦ åµŠæ°¤æƒºè‰¿ç¦ Ï… Ï… Ï… Ï… Ï… Ï… Ï… Ï… ä½£ ä½£ ä½£The 惺艿ç¦Î±Î³é£¨ 龃螅 龃螅 龃螅 颓慷 颓慷 颓慷 颓慷 颓慷 颓慷 颓慷 颓慷 å› è€Œ å› è€Œ å› è€Œ å› è€Œ å› è€Œ å› è€Œ å› è€Œ å› è€Œ å› è€Œ å› è€Œ å› è€Œ å› è€Œ å› è€Œ å› è€Œ å› è€Œ å› è€Œ å› è€Œ å› è€Œ å› è€Œ å› è€Œ å› è€Œ 轴承 轴承 轴承 轴承 轴承 轴承 轴承 轴承 轴承 轴承 轴承 轴承 轴承The residual stress can cause deformation or even cracking of the part; it should be given satisfaction).
The impurities in the brain and the steel contain non-metallic inclusions and harmful elements (acid-soluble) content; their damage to the function of steel tends to grow with each other; for example, the higher the oxygen content; the more oxide impurities. The influence of impurities in steel on the mechanical function and the failure resistance of the workpiece is related to the type, nature, quantity, size and shape of the impurities; however, it generally has the effect of reducing the tolerance, plasticity and fatigue life.
With the increase of the scale of the impurities; the fatigue strength decreases accordingly; and the tensile strength of the steel is higher; the downward trend is increased. The oxygen content in the steel is increased (the oxide noisy is increased); the tortuous fatigue and the fatigue of the touch fatigue are Under the high stress effect, it also decreases. Therefore, regarding the bearing parts operating under high stress; it is necessary to reduce the oxygen content of the steel for production. Some studies indicate that the MnS impurities in the steel; due to the shape of the ellipsoid, And it can wrap large oxides and noisy, so it has little effect on the decline of fatigue life and can also be beneficial, so it can be manipulated from wide.
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What are the data elements that affect the bearing life?
Source: China Bearing Network Time: 2013-08-12