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Hot carbon CrNiMo carburizing bearing steel compression recrystallization behavior
Published:2014-7-24 17:51:21
Carburizing bearing steel is low carbon or carbon steel, high surface hardness, wear resistance and high fatigue strength and dimensional stability after carburizing, while bearing material core unit also requires a certain toughness and high resistance thermal properties, used in the manufacture of bearings to withstand shock loads, such as rolling mills, heavy vehicle, motorcycle bearings. Low-carbon CrNiMo author carburizing bearing steel as material, analyzes the nucleation and growth of the size of the state of the thermal compression process grains derived activation energy of deformation, to establish the flow stress constitutive equation and heat-treating process diagram, Test out the compressed like static recrystallization critical time, with a view to a low-carbon CrNiMo carburizing bearing steel hot forming to provide theoretical and experimental basis.
Kunming University of scholars to explore low-carbon CrNiMo carburizing bearing steel hot compression recrystallization behavior, use Gleeble1500D thermal simulation testing machine test steel was Isothermal compression simulation test, test deformation temperature of 900 ~ 1050 ¡æ, strain rate 0.1,1,10s-1, the amount of deformation of 10%, 30%, 50%. By deformation under different conditions, true stress - true strain curve and grain size variation of thermal deformation dynamic recrystallization process was analyzed, a linear regression of deformation activation energy and material flow stress constitutive equation, thermal draw process diagram, and test out the hot static recrystallization critical time. The results showed that high deformation temperature, low strain rate and large deformation of the material in favor of dynamic recrystallization, test steel at a temperature of 1050 ¡æ, deformation of 50%, the strain rate is obtained recrystallized fine 1s-1 under the conditions of grains, the average grain size of 14.97¦Ìm; carbon CrNiMo carburizing bearing steel deformation deformation activation energy is greater than the slow deceleration after 30%, 50% deformation amount of activation energy 436.016kJ / mol, thermal processing chart with test results accord; 900 ¡æ, when the 1s-1,50% deformation of the material to achieve dynamic recrystallization thermodynamic conditions, holding static recrystallization critical recrystallization time is 5min. Tag: bearing steel prices, bearing steel