Impacts of toughness or shock absorption function size factors

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Practice has proved that the AK, É'K value sensitive tissue defects of the material, sensitive material quality, the macro defect and microstructure small changes, and thus the impact of the test was used to test the smelting and thermal processing quality production effectiv e long-term production One of the ways. As the degree of ductile-brittle temperature of some materials, larger, in order to determine the material from the plastic state to the brittle state conversion trends and impact test in a series of different temperatures, respectively, the measured the AK value with the test temperature changes. The experiments show that, AK decreases with decreasing temperature; in a certain temperature range, the material of the AK value sharply, indicating that the material to brittle transition from ductile state, the temperature at this time is referred to as the ductile-brittle transition temperature. Depending on the steel and conditions of use, the determination of the ductile-brittle transition temperature shock absorbing power, brittle fracture, lateral expansion value assessment method.abec 7 bearings
Impact test at room temperature under steel GB/T2778-91 "Method for determination of metal Charpy impact fracture" GB/T229-94 "metal Charpy notched impact test method. Metal low-temperature and high-temperature impact test to see the specific requirements of GB4159-84 and GB5775-86.bearing sales