Effect of Ce on morphology of sulfides in crankshaft steel 49MnVS3
The crankshaft is an extremely important mechanical component,commonly used in various engines,and is an important component for converting linear motion into rotational motion in internal combustion engines.Fo-cused on the control of sulfide morphology in crankshaft steel 49MnVS3,the morphology,size,distribution,and quantity of sulfides in ingots with different Ce contents were statistically analyzed using Olympus metallographic mi-croscope,Zeiss scanning electron microscope,and OTSInca steel inclusion automatic analysis system.Three-dimen-sional morphology of sulfides through electrolytic erosion was observed and the deformation ability of different types of sulfides through thermal compression experiments was evaluated.The research results indicate that large-sized e-longated MnS inclusions gradually transform into dispersed small-sized spherical(Ce,Mn)S composite inclusions with the increase of Ce content in steel.The aspect ratio and density of sulfide inclusions in steel have undergone significant changes,the size of inclusions in steel decreases from 4.6 μm to 2.3 μm,the aspect ratio decreases from 2.9 to 1.8,and the number of inclusions per unit area increases from 32 to 65.The spheroidization rate of inclusions in the ingot significantly increases.After thermal compression,the size of MnS inclusions in the experimental steel without Ce addition is around 20 μm,it presents a long linear shape in the vertical compression direction,while the sample containing Ce inclusions in Ce added are not undergone significant deformation and maintaine good dispersion distribution characteristics.The results provide theoretical guidance and technical support for the development of high-quality non quenched and tempered steel preparation technology.
NETL
NSTL
万方数据
