Method for characterizing average thickness of alpha polluted layer of cylindrical titanium-alloy sample

[0036] Example 1

[0037] Machining contains the original alpha pollution layer The M12 ZTC4 titanium alloy cylindrical tensile sample was used (WEW-600) universal testing machine to perform tensile experiment at room temperature to obtain the tensile fracture. The prepared tensile fracture was observed under the flat light source of the LeiCaM80 stereo microscope Appearance, adjust the brightness 10, the contrast 90, adjust the focal length to make the pollution layer appear white and bright, the matrix is ​​off-white, take a color photo including the entire fracture surface, see details figure 1 . Open the second phase content determination program in the Micro-imageAnalysis&process special software, load the magnification, perform threshold segmentation to extract the phase to be tested, determine the percentage content of the α-contaminated layer in the picture to be 4.3%, and deduct the background in the picture to be the α in the sample The area content of the pollution layer

[0038] Example 2

[0039] Machining contains the original alpha pollution layer The M12 ZTC4 titanium alloy cylindrical tensile sample was pickled in hydrofluoric acid and nitric acid for 20 minutes to obtain a tensile sample containing a part of the α-contaminated layer, and the (WEW-600) universal testing machine was used to perform the tensile experiment at room temperature. Stretch the fracture, observe the morphology of the fracture under the LeiCa M80 stereo microscope flat light source, adjust the brightness to 20, the contrast to 80, and adjust the focus to make the pollution layer appear white and bright, the substrate is gray and white, and the entire fracture morphology is captured. Color photos of figure 2 . Open the second phase content determination program in the Micro-image Analysis&process special software, load the magnification, and perform threshold segmentation to extract the phases to be tested, open the second phase content determination program in the Micro