Abstract
Based on dilatometric tests, the effect of various values of previous deformation on the kinetics of austenite transformations during the cooling of 100Cr6 steel has been studied. Dilatometric tests have been performed with the use of the optical dilatometric module of the plastometer Gleeble 3800. The obtained results were compared to metallographic analyses and hardness measurements HV30. Uniaxial compression deformations were chosen as follows: 0, 0.35, and 1; note that these are true (logarithmic) deformations. The highly important finding was the absence of bainite. In addition, it has been verified that with the increasing amount of deformation, there is a further shift in the pearlitic region to higher cooling rates. The previous deformation also affected the temperature martensite start, which decreased due to deformation. The deformation value of 1 also shifted the critical cooling rate required for martensite formation from the 12 °C/s to 25 °C/s.
Highlights
Transformation diagrams can be divided into two types
The transformation of supercooled austenite is influenced by austenitization temperature, initial structure, austenitic grain size, and previous deformation [8,9,10,11,12,13,14,15,16,17]
It is certainly more appropriate to design diagrams on the basis of dilatometric tests that are performed on specimens of specific qualities [37,38,39,40,41]
Summary
Transformation diagrams can be divided into two types. The first type is the time-temperaturetransformation (TTT) diagram, which describes the austenite transformations during an isothermal dwell. The accelerating effects of increasing deformation and strain rate on ferritic deformation, innuclei—this combination the chemical composition and other haseffects different effects phase leads with to the acceleration of both transformations. Ar3 is the of austenite to ferrite and the deformation accelerates diffusion-controlled transformations, the transformation the transformation temperature of austenite to pearlite cooling offrom hypoeutectoid steels). The diagrams are calculated on the basis of the equations compiled for the selected steel chemical composition range, but their accuracy is not always optimal For this reason, it is certainly more appropriate to design diagrams on the basis of dilatometric tests that are performed on specimens of specific qualities [37,38,39,40,41]. This experiment was realized in order to verify the effect of the
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