INVESTIGATION OF THE INFLUENCE OF THE INITIAL MICROSTRUCTURE UNDER DIFFERENT MODES OF HEAT TREATMENT ON THE MECHANICAL PROPERTIES OF 35CrMnSi STEEL
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- TITLE: INVESTIGATION OF THE INFLUENCE OF THE INITIAL MICROSTRUCTURE UNDER DIFFERENT MODES OF HEAT TREATMENT ON THE MECHANICAL PROPERTIES OF 35CrMnSi STEEL
- ABSTRACT: The influence of the initial microstructure on the mechanical properties of 35CrMnSi steel samples is investigated in the article. The main goal of the research is to obtain an initial microstructure, providing a favorable basis for subsequent processing by surface plastic deformation. Four groups of samples are made and subjected to heat treatment in different modes. The first group was examined in the state as-received, the other three processed by: annealing at a temperature of 600ºC with a heating time of 90 min and furnace cooling; annealing at a temperature of 880ºC with a heating time of 90 min and furnace cooling; normalization at a temperature of 880ºC with a heating time of 30 min and air cooling. By phase and microstructural analysis, it was found that phase conversion is present only after normalization, and the resulting structure is a combination of sorbite-like perlite and residual austenite. The samples subjected to normalization show the highest values for tensile strength, hardness, and microhardness compared to the other groups of heat treatment modes.
- PAGES: 8-
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