Özet:

The cryogenic treatment is a complementary procedure that has been applied to a variety of materials to improve their mechanical and physical properties. It was first commercially recognized as an effective method in achieving complete martensitic transformation in the alloyed steels. In this study, microstructural investigations were carried out in order to relate the microstructural properties to the mechanical properties following the cryogenic treatment. For this purpose, the conventional heat treatment (CHT) and the deep cryogenic treatment (DCT: -196°C) procedures were applied to various medium carbon spring steels. Microstructural examinations were carried out by using scanning electron microscopy. The martensite lattice parameters and the amount of retained austenite were measured by using a high-resolution X-ray diffractometer. Rietveld analysis was used to deconvolute the overlapping peaks of martensites.

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