Quantitative analysis method of metal phase volume fraction gradient distribution of cutting surface layer of duplex titanium alloy

Abstract

The invention discloses a quantitative analysis method of metal phase volume fraction gradient distribution of a cutting surface layer of a duplex titanium alloy. The method comprises: processing a titanium alloy cut sample into a test piece through wire-electrode cutting and inset, polishing and corroding the test piece to obtain a surface to be detected, scanning the surface to be detected through a scanning electron microscope to obtain an electron microscope image, converting the electron microscope image into a gray image through gray scale processing, trimming the electron microscope image to obtain an effective electron microscope image, dividing the effective electron microscope image into a phase region alpha and a phase region beta according to gray scales, carrying out binarization processing on the effective electron microscope image, carrying out dissociation layering along the cutting depth direction, counting the number of phase alpha pixels and phase beta pixels in eachlayered image, wherein the percentage of the phase alpha pixels and phase beta pixels in total pixels in each layered image is a volume fraction of the phase alpha and the phase beta in layered images, and acquiring the characteristic of the metal phase volume fraction gradient distribution of the side profile of a cut test sample according to the volume fractions of the phase alpha and phase beta in each layered image.

Description

technical field [0001] The invention relates to the technical field of characterization and evaluation of microstructure distribution characteristics of a metal material cutting surface layer, in particular to a quantitative analysis method for the metallographic volume fraction gradient distribution of a duplex titanium alloy cutting surface layer. Background technique [0002] According to the different metallographic types, titanium alloys can be divided into α-type titanium alloys, β-type titanium alloys and α+β-type titanium alloys. The physical and mechanical properties of the α+β duplex titanium alloy are not only affected by the properties of the α and β phases themselves, but also depend on the volume fraction of the α and β phases. [0003] The high temperature, high stress and high strain rate generated by the cutting process lead to phase transition of the machined surface layer material, resulting in the volume fraction of α and β phases in the machined surface ...

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Problems solved by technology

[0004] At present, the method for quantitative analysis of the metallographic volume fraction is mainly the X-ray diffraction method (XRD), but this method cannot be used to quantitatively describe the metallographic gradient distribution of the side section of the cutting sample. On the one hand, the X-ray diffractometer The focus size of the laser is relatively large, generally a long and narrow rectangle (millimeter level), and the measured metallographic volume fraction is the average value of this rectangular area. Micron scale), X-ray diffractometer is difficult to achieve such a high resolution

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