Efecto del tratamiento criogénico en la resistencia al impacto y la microestructura de un acero A 572
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This paper presents the results of an experimental study carried out on A 572 steel specimens, which sought to establish the influence of the quenching- cryogenics and tempering thermal treatments on the impact resistance and microstructure of the material. The sequence of treatments was established in this way: 4 specimens were treated in a quenching at 770ºC, 4 specimens in a quenching - cryogenics at 12 hours exposure and tempered at 400ºC, 4 specimens at a quenching - cryogenic at 24 hours exposure and tempering and 4 specimens without treatment. The results indicate that the hardness of the cryogenically treated material at 24 hours increases slightly with respect to the cryogenically treated probe at 12 hours and the untreated material, however, no change in the results of energy absorbed by the material with cryogenic treatment was observed compared the untreated material, because the microstructure of the material, in the tempered martensite grains is further refined and manganese precipitate appears, however, it does not influence the variation of the mechanical properties of the material, except in the hardness.