Failure behavior of SCM-420 steel under effect of non-metallic inclusions
Abstract：In order to study the effect of non-metallic inclusions on the microstructures of steel,the morphology of inclusions,microstructure of matrix and failure fracture surface of SCM-420 structural steel were observed and analyze with optical microscope（OM）,scanning electron microscopy（SEM）,micro-hardness tester and energy dispersive spectrometer（EDS） equipped on SEM.The results indicate that the inclusions are mainly dot-like oxide and silicate mixture,lumpish oxide and strip silicate.The decarburized layer is observed around the inclusions,and its microstructure is composed of single-phase ferrite.The eutectic-like microstructure forms due to the reaction between inclusions and matrix.The non-metallic inclusions and decarburized layer can be regarded as the channel of microcracks,which results in the brittle fracture of SCM-420 structural steel.
Keywords：non-metallic inclusionmicrostructurefracture surfaceoxidesilicatedecarburized layerferriteeutectic-like microstructurebrittle fracture
Publication Date：2011-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)