Study on plain strain compression of low carbon steel based on Thermecmastor thermal simulation technology
The local strain changed when the specimen geometry was different during plain strain compression.The microstructure and mechanical properties of specimen changed corresponding to different local strain after cooling.The process of plane strain compression is particular similar to rolling.To study the plane strain compression tech-nology of large sample more reasonably and accurately based on thermal simulation machine and realize the material research from process to mechanical properties,the plane strain compression experiment of Q235 low carbon steel with dimension of 30 mm×30 mm× 140 mm was carried out by Thermecmastor.Based on the austenite transforma-tion temperature calculated by Thermo-Calc software,the thermal simulation process was confirmed.Combined with the metallographic microscope,the microstructure evolution law of the deformation zone,transition zone and undeformed zone of the plane strain sample was analyzed and the microstructure of relative uniform area was deter-mined.Based on the determined relative uniform area,the reasonable dimensions of tensile and impact specimens were processed and its mechanical property were charactered and compared with original specimens.The microstruc-ture before and after plain strain compression were charactered by X-ray diffraction(XRD),scanning electron micros-copy(SEM),electron backscatter diffraction(EBSD)and transmission electron microscopy(TEM).The improve-ment of the mechanical properties of the plane strain sample was mainly due to the refinement of ferrite grains and the smaller size and more uniform distribution of pearlite clusters.Based on the plane strain compression technology of Thermecmastor,the research mode of process → microstructure → mechanical properties of low carbon steel was realized,which provided a thermal simulation method for studying the microstructure and mechanical properties of metal materials such as steel in the same specimen.At the same time,by comparing and analyzing the microstructure and mechanical properties of specimens before and after plane strain compression,the process optimization of com-mercial low carbon steel using thermal simulation machine was explored,which provided guidance and data support for industrial optimization of commercial Q235 low carbon steel.
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