Six major cause of the spring material fatigue

Spring makes our days see more at ordinary times, its job * should reflect in the electronic, resistance to air, steam, water and other corrosive medium and acid, alkali, salt and other chemical corrosive medium corrosion of stainless steel spring, on the basis of spring material mechanical properties can be divided into various types of spring, and in the days when using, the spring tired what is the reason, * should have the following six big reasons. 1, the bending strength and bending strength data have surely relationship between fatigue limit, in general, the higher the material yield strength, fatigue strength is higher, therefore, in order to progress the spring fatigue strength should be managed to progress the spring material yield strength, or choose the high yield strength and tensile strength ratio of data. For the same material, fine grained than thick grain arrangements with higher yield strength. 2, appearance condition * big stress occurs in the surface layer of spring material, so the spring appearance quality has much effect on the fatigue strength. Spring data in the process of rolling, drawing, and rolling, shortcomings and so on defect and scar formation of crack is often formed spring fatigue cracking. The smaller the data of surface roughness, gather in the less stress and fatigue strength is also higher. The influence of surface roughness on the fatigue limit data. Follow the add of surface roughness, lower fatigue limit. In the case of the same roughness, different steel grade and different rolling method to the extent of the fatigue limit is different also, such as cold heat coil spring small extent of the coil spring. Because steel hot coil spring and its heat treatment when heated, make the spring data looks rough and happen because oxidation decarburization phenomenon, so it reduces the fatigue strength of the spring. For grinding material appearance, crush, blasting and rolling, etc. To be able to progress the spring fatigue strength. 3, the larger of the scale of the scale effect of information, because all kinds of faults formed by the cold and hot working technology of the higher the possibility and the possibility of appearance defects are, the greater the function of these reasons can cause fatigue is reduced. The fatigue strength of the spring in accounting to ponder on the influence of scale effect. 4, metallurgy metallurgical weakness weakness refers to guess the nonmetallic inclusions, bubbles, element segregation, and so on. Exists in the appearance of the inclusions is stress converged on the source, would cause inclusions and matrix interface between premature fatigue crack. Choose the way such as exercise vacuum, vacuum casting, can greatly advance the quality of steel. 5, corrosive medium when spring in corrosion medium, because looks pitting or they grain boundary corrosion and become tired source, while under the effects of varying stress will gradually expand and cause craze. Such as the spring steel in fresh water homework, fatigue limit is only 10% ~ 25% in the air. Corrosion influence on spring fatigue strength, is not only related to the effect of the spring by the variable load times, and is associated with a good job. So when designing accounting affected by corrosion of the spring, homework should be full of thinking. In spring corrosion under the conditions of operation, in order to ensure its fatigue strength, can choose the material of high corrosion resistant function, such as stainless steel, nonferrous metals, or appearance to add protective layer, such as plating, oxidation, coating, paint, etc. Practice indicate the cadmium plating can greatly advances the spring fatigue limit. 6, temperature fatigue strength of carbon steel, decrease when from room temperature to 120 ℃, from 120 ℃ to 350 ℃ rise again, after temperature higher than 350 ℃ is reduced, there is no fatigue limit at high temperature. Under the condition of high temperature operation of spring, to think to choose heat resistant steel. Under room temperature conditions, the fatigue limit of steel added.
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