Numerical Simulation Study On Ultra-fine Grained Rod Rolling Of Medium Carbon Steel

Compared with the ordinary bar, ultra-fine grained rod with good obdurability has been not onlythe research focus of the world, but also a widely used engineering material in the future according to“the theory of microstructure refinement”. There are many factors that can affect organizationalsuperfine refinement, temperature and strain are the key to its preparation. Especially under high Zvalue, dynamic recrystallization occurs through α-Fe continuous dynamic response to refineorganization. Manufacture below1μm ultra-fine ferritic organization when introduces large plasticdeformation in grain boundary appearing large angle ultra-fine equiaxial grain. But in the bar rollinghow to get the groove parameters to increase strain met with obstacles. Therefore, base on physicalsimulation and numerical simulation technology, the paper builds new pass system through innovativegroove design for studying the feasibility of industrial production of sub-micron ultrafine grain size bar.For numerical simulation study on ultra-fine grained rod rolling process parameters of mediumcarbon steel, by Gleeble3500thermal simulation of compression testing machine and scanning electronmicroscope. Warm deformation characteristics of medium carbon steel were analyzed; The basic rulesof grain refinement are investigated; The relation between processing parameter Z and the ferrite grainsize and material organization performance are studied.Using experiment mathematical models and nonlinear finite element as tool. Compared with theanalysis and discussion of traditional pass researched the “M new slot” parameters influence on themetal flow law, heart of accumulated strain and groove size. As well as, set up convex-oval groove andthe new pass system to analyze percentage reduction of area. The grain size and deformationparameters relationship embedded into finite element model through the finite element softwareABAQUS provides VUSDFLD subroutine, studied the temperature field, strain field and velocity fieldetc., finally realized the ferrite grain size control.Through numerical simulation study on ultra-fine grained rod rolling of medium carbon steel canaccurately know the distribution of temperature field, strain field in the rolling process. Through thephysical simulation experiment can effectively verify the condition of producing ultra-fine grain whichprovided experiment evidence for finite element simulation. For the new process of rolling ultra-finegrain bar provides guidance.