Abstract
The compression deformation behaviors of 35CrMo steel at different conditions was studied by using Gleeble-3810 thermo-simulation machine under large strain. The results indicate that the flow stress curves of 35CrMo steel is affected by strain rate and deformation temperature, showing the characteristics of dynamic recovery (DRV) and dynamic recrystallization (DRX), which is the main softening mechanism of 35CrMo steel. The activation energy (Q) and Zener–Hollomon parameter (Z parameter) expression for thermal deformation of this steel was calculated by linear regression. The inflection point on the curve of strain hardening rate and flow stress (θ-σ curve) corresponds to the beginning of DRX, and the critical strain of DRX increases with the decrease of deformation temperature and the increase of strain rate. Based on the inflection point criterion, the constitutive equation of the critical strain of DRX of 35CrMo steel was established: εc = 0.000232Z0.1673, which reflects the variation of the critical strain of DRX with the Z parameter. In addition, through metallographic observation, the rationality of the inflection point criterion in determining the critical strain of DRX of 35CrMo steel was verified, and the DRX state diagram was established.
Highlights
Microstructure control of metals and alloys during thermal processing is an important key because it allows control of the final microstructure of the alloy as well as the required mechanical properties.One of the most important mechanisms of microstructure control in thermal deformation is dynamic recrystallization (DRX), which occurs in several metals and alloys [1,2,3]
The traditional view is that the emergence of the peak stress of the rheological curve represents the occurrence of DRX, but for some materials with strain hardening properties the rheological curve does not show significant peak characteristics, even if the presence of DRX is confirmed by metallographic observation
The flow stress of metals is affected by the change of internal dislocation density
Summary
Microstructure control of metals and alloys during thermal processing is an important key because it allows control of the final microstructure of the alloy as well as the required mechanical properties. One of the most important mechanisms of microstructure control in thermal deformation is dynamic recrystallization (DRX), which occurs in several metals and alloys [1,2,3]. Due to its good wear, impact, corrosion, and fatigue resistances—and its price being much lower than that of chromium-nickel alloy steel with the same mechanical properties—35CrMo steel is widely used in processing of mechanical products, vehicle assembly, mining, and other industries. It is heavily used in the manufacturing of various small and medium-sized parts such as driveshafts, crankshafts, and fasteners [12,13,14,15].
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