Evaluation of the percentage of austenite retained in martensitic stainless steel din 1.4110 with different time intervals between the quenching and cryogenic treatment
DOI:
https://doi.org/10.18226/25253824.v5.n9.08Keywords:
heat treatment, retained austenite, stainless steel, instrumental analysisAbstract
This work aims to evaluate the percentage of austenite that is retained in the matrix of DIN 1.4110 steel, after the processes of tempering and cryogenics due to the alternation of the time interval between the two heat treatments. For that, samples of steel were heat-treated in a 7-stage oven in a controlled atmosphere and accelerated cooling to perform the tempering. Four different intervals between heat treatments were defined: immediately, 6, 12, and 24 hours after tempering. Cryogenic treatment was performed with the same parameters for all samples. Hardness tests and metallography were used in order to characterize the alloy and the X-ray diffraction test to evaluate the amount of austenite retained. The results obtained indicate that the waiting time between treatments reflected directly in the percentages of austenite retained in the steel. As extremes of the test, the percentage of cryogenics performed 24 hours after the quenching treatment was 23.6; whereas for the cryo-genic treatment performed immediately after tempering, the percentage of 11.9% was reached.
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