Study on influencing factors of automatic statistical analysis of carbides and nonmetallic inclusions in H13 steel by scanning electron microscope
The effects of magnification,image resolution,beam size,working distance,detection area and gray threshold on the analysis results of carbides and nonmetallic inclusions in H13 steel by scanning elec-tron microscope(SEM)were discussed.A method for simultaneous measurement of inclusions and carbides by SEM was determined.The results showed that with the increase of magnification,the increase of carbide quantity was obviously greater than that of inclusion quantity.For the inclusions and carbides in H13 steel(above 1 μm),the magnification was recommended to be about 200.The image resolution and magnification had consistence for the identification of the smallest particle size.The resolution above 512×512 was rec-ommended for the H13 steel.The quantity density of carbides and inclusions in H13 steel increased first and then decreased with the increase of beam current,which was related to that the optimal resolution of SEM could be obtained under the maximum beam current.The working distance had little influence on the particle type,quantity and size,and it mainly affected the counting of energy spectrum.The larger the de-tection area was,the longer the detection time was.In the actual test,the detection area of H13 steel should be guaranteed to be more than 20 mm2 in order to ensure the effectiveness of the results.Dual threshold setting should be adopted for testing carbides and inclusions in H13 steel.
H13 steelcarbideinclusionscanning electron microscope(SEM)automatic statistical analysis
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