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Possible improvement of mechanical properties and fracture toughness of low-alloy steel API 5L X52 after helical rolling under the conditions of cooling rate variations is analyzed. Upon helical rolling and air cooling (Regime I), the average ferrite grain size in this steel is observed to decrease from 13.5 μm in the initial state to 3.5 μm, the volume fraction of pearlite also decreases, the banded...
The structure and the mechanical properties of the high-strength structural martensitic steels used in manufacturing the mechanism parts subjected to significant cyclic dynamical loads are considered. All the steels have a similar martensitic–bainite structure and a high stability of their mechanical properties. At the same time, their structures are found to contain secondary phases, which can degrade...
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