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The long-term production practice has proved AK, alpha K value tissue defects on the material is sensitive to small changes, can sensitively reflect the quality of material, the microstructure and the macroscopic defects, so the impact test is one of the effective ways of production used to test the smelting and heat processing quality. Because of the temperature on some materials brittle influential, in order to determine material by plastic state to the brittle state transformation trend, can impact tests carried out in a series of different temperatures respectively, determination of AK value change with the test temperature. Experiments show that the AK decreases with the decrease of temperature; in a certain temperature range, the AK value of the material decreases sharply, results show that the material toughness to brittleness transition state by state, this temperature is called the ductile to brittle transition temperature. According to the different steel and use condition, to determine the ductile to brittle transition temperature have impact absorbing energy, percentage of brittle fracture, side expansion of different evaluation methods.
The normal temperature of steel impact test according to GB/T229 - 94 "metal Charpy Notch Impact Test Method" and GB/T2778 91 "metal Charpy impact fracture determination method" the provisions of. Metal of low temperature and high temperature impact test specific requirements see the GB4159 - 84 and GB5775 - 86.