Phase analysis method for oxide scale on carbon steel surface
A technology of surface oxidation and phase analysis, which is applied in the direction of material analysis, material analysis using wave/particle radiation, and measuring devices, can solve the problem of incomplete display of iron sheet phase composition and distribution, and achieve intuitive information Effect
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[0033] In the present invention, the preparation method of the cross-sectional sample preferably includes:
[0034] Cut the sample into thin slices by wire cutting;
[0035] Thermally mosaic and fix the thin slice sample to obtain a mosaic sample;
[0036] Grinding and polishing the mosaic sample to obtain a mirror sample;
[0037] The mirror sample was cut with an argon ion cutter to obtain a cross-sectional sample with a stress-free surface.
[0038] In the present invention, the sample is preferably steel with scale.
[0039] In the present invention, the length of the flake-like is preferably 10 mm to 20 mm, more preferably 12 to 18 mm, most preferably 14 to 16 mm; the width is preferably 5 to 10 mm, more preferably 6 to 9 mm, most preferably 7 to 10 mm. 8mm; the thickness is preferably 2mm-5mm, more preferably 3-4mm.
[0040] In the present invention, the flakes contain iron oxide scales, the iron oxide scales are distributed on the surface formed by the length and wi...
Embodiment 1
[0061] First cut a cross-sectional sample with a length of 10mm*8mm*5mm on the steel slab (the surface formed in the length and width directions contains iron scale), fix the sample by hot embedding, and then use 180#, 280#, 400# in sequence , 800# and 1200# metallographic sandpaper to grind metallographic samples, and then carry out metallographic polishing on polishing cloths of 9 microns, 3 microns, 1 micron and 0.5 microns; use argon ion cutting machine to polish the cross-section samples Cut out 1mm 2 The surface stress-free layer was obtained to obtain a cross-sectional sample.
[0062] Stick the prepared cross-section sample on the sample stage with a pre-tilt of 70° and put it into the scanning electron microscope, adjust the focal length of the sample surface at a working distance of 15mm, then insert the probe of the electron backscatter diffractometer, and select FeO, Fe 2 o 3 and Fe 3 o 4 As the retrieval phase, first observe whether a clear Kikuchi pattern can...
Embodiment 2
[0068] First cut a cross-sectional sample with a length of 10mm*8mm*5mm on the steel slab (the surface formed in the length and width directions contains iron scale), fix the sample by hot embedding, and then use 180#, 280#, 400# in sequence , 800# and 1200# metallographic sandpaper to grind metallographic samples, and then carry out metallographic polishing on polishing cloths of 9 microns, 3 microns, 1 micron and 0.5 microns.
[0069] Stick the prepared cross-section sample on the sample stage with a pre-tilt of 70° and put it into the scanning electron microscope, adjust the focal length of the sample surface at a working distance of 15mm, then insert the probe of the electron backscatter diffractometer, and select FeO, Fe 2 o 3 and Fe 3 o 4 As a retrieval phase, first observe whether a clear Kikuchi pattern can be obtained. If not, return to the above steps to prepare a new cross-sectional sample for observation; if a clear Kikuchi pattern is obtained, you can start coll...
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Abstract
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