Reasons Analysis on Unqualified Percentage Elongation after Fracture of Q345R Steel Plates
The microstructure,tensile fracture morphology and inclusions were observed and analyzed by optical microscope,scanning electron microscope and energy disperse spectrometer respectively to find out the reasons for the disqualification of percentage elongation after fracture of Q345R steel plates.The results show that the main reason for the unqualified percentage elongation after fracture was the serious banded structure,especially the wide bainite hard microstructure band and the widmanstatten structure.Existing sulfide inclusions had a certain effect on the percentage elongation after fracture of the steel plates,but it was not the main reason.
Q345R steel platepercentage elongation after fracturebanded structurebainitewidmanstatten structureinclusion
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