INFLUENCE OF TECHNOLOGICAL PARAMETERS OF HEAT TREATMENT ON THE STRUCTURE AND PROPERTIES OF CRITICAL PARTS MADE OF STEEL X12MF
EBVHEG
DOI:
https://doi.org/10.25712/ASTU.2072-8921.2023.02.030Keywords:
alloy steel, quenching, tempering, microstructure, mechanical propertiesAbstract
The paper presents the results of a study of brittle fracture of a part made of steel X12MF (D2 AISI). The following general features are characteristic of these steels. The heterogeneity in the distribution of carbides is significant; it increases with an increase in the cross-section of rolled products (forgings) and the content of chromium and carbon; consequently, the mechanical properties in large sections with a diameter of more than 40-50 mm are reduced. The results obtained indicate an "under–release" of the product (the release temperature is below 1800 C), either due to insufficient exposure time during release, or (most likely) due to a combination of reasons consisting in a decrease in the actual release temperature and insufficient exposure time.
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