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Hot deformation behavior of antibacterial stainless steel containing 4.35% copper |
LI Hua-ying1, LIU Guo-xiang1, SONG Yao-hui1, ZHAO Hai-quan2, LI Juan3, TIAN Ying-hao3 |
1. School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024,Shanxi, China; 2. School of Vanadium and Titanium, Panzhihua University, Panzhihua 617000, Sichuan, China; 3. Engineering Research Center of Heavy Machinery Ministry of Education, Taiyuan University of Science and Technology, Taiyuan 030024, Shanxi, China |
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Abstract Austenitic stainless steel containing copper has excellent antibacterial properties and is widely used in food processing,medical and other fields. However,the addition of copper will significantly affect the processability of stainless steel. The single pass isothermal compression test of 4.35% austenitic antibacterial stainless steel containing copper was carried out by Gleeble-3800 thermal simulation test machine. The high temperature rheological behavior of stainless steel at deformation temperature 900-1 150 ℃,deformation rate 0.01-10 s-1 and deformation amount 50% was studied. The constitutive equation reflecting the material characteristics is constructed,the microstructure after hot deformation is observed by metallographic microscope,and the microstructure evolution law under each deformation process is analyzed,which provides a theoretical reference for the plastic forming process and microstructure optimization of copper containing stainless steel. The results show that the flow stress of 4.35% Cu-304L steel is sensitive to the deformation process,and the stress decreases with the increase of deformation temperature and the decrease of strain rate. A strain compensated constitutive model based on Arrhenius fifth order polynomial fitting is established by using the stress-strain curve. According to this model the correlation coefficient(R) and average relative error(AARE) are calculated to be 0.972 and 9.03% respectively,indicating that the constructed model can accurately reflect the flow behavior of copper containing stainless steel. Combined with the microstructure,it is found that higher temperature and faster strain rate are conducive to the occurrence of recrystallization. Due to the low deformation energy provided by 0.01 s-1 low strain rate,there are still initial deformed grains at 1 100 ℃/0.01 s-1. At 900 ℃/10 s-1,the grain distortion is serious,and there is an obvious deformation band formed by dislocation stacking,which is easy to lead to cracks. At the strain rates of 1 150 ℃/1 s-1 and 10 s-1,the grains are refined and equiaxed,indicating complete recrystallization. Therefore,for 4.35% copper stainless steel,1 150 ℃/1 s-1 and 10 s-1 should be considered as its hot working range.
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Received: 14 April 2022
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