Structural Turbulence of Pearlitic Steel 09G2S at Low-Temperature Impact Toughness
Source abstract
Abstract
The study explores the effect of helical rolling on the low-temperature impact toughness of pearlitic steel 09G2S. Helical rolling in two modes was performed at T = 850°C in six passes through rolls of varied diameters with air cooling (mode I) and water quenching (mode II). The tensile σ–ε curves at room temperature are characterized by parabolic strain hardening, without any specific behavior of low-temperature impact toughness. The third mode of helical rolling was performed in the temperature range of 850–500°C, when pearlite partially transformed to bainite at low temperatures. The steel exhibited high impact toughness in this mode at low temperatures down to T = –70°C. Scanning tunneling and scanning electron microscopy revealed structural turbulence during impact toughness measurements in steel processed by mode III helical rolling. The structural turbulence is observed as the formation of isolated microvortices (islands) of plastic flow. Under impact loading, the isolated flows of structural transformation move in a rotational manner with the fulfillment of the law of conservation of angular momentum. The interaction of bainite with electron subbands, which are embedded in bainite to shield the excess positive charge in the interstitial sites of lattice curvature, breaks the interatomic bonds of bainite, leading to the formation of platelet packets, island structure, and curved bainite platelets. The steel processed in mode III shows a five-fold increase in fatigue life.
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Research context
OpenAlex topics: High-Velocity Impact and Material Behavior · Material Properties and Failure Mechanisms · Electromagnetic Effects on Materials
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References (26)
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