S44SY Crankshaft Steel Inclusion Research And Process Optimization

The crankshaft is one of the five core components of the internal combustion engine.In addition to the high fatigue life,the crankshaft steel also has high requirements for high speed,heavy load and precision.The main factors affecting these performance indicators are the cleanliness of crank steel and steel,the content,type and particle size distribution of inclusions in steel are important indicators affecting the cleanliness of molten steel.Therefore,it is important to study the type,source and formation of inclusions to improve the cleanliness of molten steel and improve the performance of steel.This topic focuses on the S44SY crankshaft steel produced by the North Heavy Industry Group.From different stages of smelting and sampling at different positions in the die casting,the distribution of inclusions in different smelting stages and inclusions in the ingot is studied.And changes in the content,the changes in inclusions in the smelting process and in the ingot are clarified.With the help of nitrogen and oxygen analyzer,Zeiss optical microscope,scanning electron microscope SEM,energy spectrum analyzer EDS,direct reading spectrometer and other analytical instruments,as well as image,factsage and other software,from theory,simulation,to actual analysis,on the crankshaft steel The elemental composition,distribution,quantity,and morphology of inclusions have been thoroughly explored.And related process optimization routes are proposed.The experimental results show that before and after VD refining,the inclusion index in steel decreases from 1.42/mm² to 1.06/mm^2.The proportion of inclusions larger than 10 microns and 15 microns decreases.The inclusions in steel are The distribution in the ingot generally shows a gradual decrease from the head to the middle,and the distribution of the same position from the center to the edge gradually decreases.