Study On The Competitive Priority Precipitation Mechanism Of Intra-Granular Ferrite In The Process Of Oxide Metallurgy

The production capacity and level of high-performance steel materials are important factors in evaluating the country's overall national strength,and continuously improving the quality of steel is the only way to build a ?steel power?.The strength and toughness of the material are important indicators for characterizing the properties of the material.Strength refers to the mechanical properties of the material against fracture and deformation.The toughness is used to characterize the energy absorbed by the material before it breaks and the ability to deform.At present,one way to improve the strength and improve the toughness is to refine the grains.In this paper,the O5 plate of the base material is remelted and resolidified by a spontaneously developed pulsed magnetic field generating device and a high frequency induction heating furnace.During the process,pulsed magnetic fields with different intensities and different action times were applied to observe the effects on metallographic structure and grain refinement.The metallographic microstructure was analyzed by metallographic microscope and multi-fractal calculation software.The mechanical properties of the metallographic structure were analyzed and studied by 3D digital microscope and Vickers hardness tester.The main findings are as follows: 1)Ti2O3 inclusions are preferentially formed when the oxygen content in the steel is low.When the oxygen content is high,MnTiO3 or Mn2TiO4 inclusions can be formed.TiN cannot be formed when the Ti content is constant.2)When the applied voltage of the magnetic field strength is 200V(1350Gs),the more the acicular ferrite formed by the test steel,the more uniform the structure,and the hardness value of the test steel reaches a maximum of 165.4 HV.3)When the magnetic field action time is 10 min,the microstructure of the test steel is good,and the hardness value of the test steel is 161.1 HV.4)The intragranular ferrite orientation induced by inclusions is preferentially located between the(001)and(111)planes,and the inclusions divide the crystal grains into several small crystal grains,and the orientation of each crystal grain is different.Figure 82;Table 26;Reference 67...