Effect of Ca and Ti contents on characteristics of inclusions in Fe-Si-Cr-Mn-Al-Ti-Ca-O melts  

作　　者：Ren-sheng Li Meng-chuan Li Tong-sheng Zhang Wan-lin Wang 

机构地区：[1]School of Metallurgy and Environment,Central South University,Changsha 410083,Hunan,China [2]International Union Research Center for Clean Metallurgy,Central South University,Changsha 410083,Hunan,China [3]WMG,University of Warwick,Coventry CV47AL,UK

出　　处：《Journal of Iron and Steel Research International》2023年第10期1952-1962,共11页

基　　金：The financial supports from the National Natural Science Foundation of China(51904346);the Introduce Talents Research Fund of Central South University are greatly acknowledged.

摘　　要：The inclusion characteristics in 55SiCr spring steel with different contents of titanium and calcium were investigated.The chemical compositions of steel samples were detected by inductively coupled plasma optical emission spectrometer,and the inclusion characteristics was determined by field emission scanning electron microscopy(FE-SEM)and energy-dispersive spectroscopy.The results show that the Ti/Al ratio should be kept at less than 1,and the content of calcium should be controlled between 0.0015 and 0.0025 wt.%in Si-Mn-Al deoxidized steel,so that more solid inclusions can be converted to liquid inclusions.Moreover,the high Ti content in melts is the direct cause of the high proportion of Ti_(3)O_(5) in the inclusions,which involves[Ti]to reduce SiO_(2) and A1_(2)O_(3) in inclusions.In addition,calcium treatment can reduce the content of Ti_(3)O_(5) in inclusions,and the degree of reduction is closely related to the content of[O].The thermodynamic calculation of Fe-Si-Mn-Cr-Al-Ti-Ca-O molten steel system during solidification process was performed by FactSage software,taking all types of inclusions into account,such as titanium oxide,calcium oxide,aluminum oxide,silicon oxide,manganese oxide,calcium titanate,mullite,calcium aluminate,and liquid inclusion.The inclusion type of calculation results was in accordance with the experimental results at 1550℃,and TiO_(x) aggregation behavior was consistent with the Ti_(2)O_(3)-containing precipitation phase.

关 键 词：Spring steel INCLUSION Titanium treatment Calcium treatment Thermodynamic calculation 

分 类 号：TG14[一般工业技术—材料科学与工程]