Method for analyzing structural change of CADI after impact wear
An analysis method, a technology of tissue change, applied in the analysis of materials, material analysis using radiation diffraction, material analysis by optical means, etc., can solve the problems of CADI grinding ball wear and corrosion effects, tissue deformation, complex stress, etc. The effect of improving analysis efficiency and analysis level, improving work efficiency and analysis level
Inactive Publication Date: 2019-10-11
TIANJIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology
[0003] Although CADI materials have good wear resistance and economic benefits in the actual application process, there are still some problems in the existing service environment. For example, CADI grinding balls will generate complex stress during production and use. It has a significant impact on the wear and corrosion of CADI grinding balls. Under the action of impact load, a hardened layer with higher hardness is formed on the surface of CADI grinding balls, and the hardness increases by 8 to 10HRC, and the structure is deformed. In actual work, the grinding ball's The hardened layer is in direct contact with abrasives and other grinding balls, and the performance of the hardened layer directly determines the working performance of CADI grinding balls
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[0013] The following is attached figure 1 , 2 As well as specific embodiments, the technical solutions of the present invention are described in detail.
[0014] In the example of the present invention, the background of CADI structure transformation after impact wear is mainly derived from the actual working conditions of industrial CADI wear parts, especially mine grinding balls, and the stress conditions of wear parts and grinding balls during work. The expression method of predicting CADI structure transformation includes structure deformation, increase of structure hardness, and change of residual stress of structure in which martensitic transformation occurs in the structure.
[0015] By observing the appearance and structure of CADI after impact wear, the preliminary structure phase transformation information was obtained. After impact wear, the impact surface of the CADI sample was obviously deformed, the weight of the sample became lighter, and the structure of the ...
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The invention discloses a method for analyzing a structural change of CADI after impact wear, and relates to the structural phase change of a wear-resistant material CADI under external force and a method for quantitatively analyzing the structural transformation of the CADI. The method mainly comprises the following steps of obtaining a phase composition background of the CADI; carrying out metallographical observation on the thermally treated CADI so as to obtain initial phase information of the structural transformation; carrying out an impact wear test on the CADI to ensure that the CADI structure obtains structural transformation power; and determining structural transformation reasons and laws through a material analysis method. By utilizing the method, structural transformation reasons of the CADI can be obtained to provide effective basis for the later material wear resistance optimization and failure analysis.
Description
technical field [0001] The invention relates to a performance test of wear-resistant materials after processing, in particular to a method for testing the structure of carbide-containing ausferite ductile iron after impact wear. Background technique [0002] Carbide-containing austempering ductile iron (CADI for short) is a new type of material derived from austempering ductile iron (abbreviation ADI). CADI is a low-alloy ductile iron with low content of alloying elements such as Cr, Mn, Si, Cu, Mo, Ni, etc. The heat treatment process is austenitizing followed by austempering. Its matrix structure is graphite balls, about 10% carbides, residual ausferrite and acicular ferrite. CADI has the advantages of high hardness, good plastic toughness, good wear resistance and low cost. Among various wear-resistant materials, the impact toughness of high-chromium alloy cast iron is poor, and the ball is fragile in actual work; high-manganese steel has good toughness but low hardness...
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IPC IPC(8): G01N3/56G01N3/40G01N21/84G01N23/2055G01N23/2251G01L5/00G01N23/207
CPCG01L5/0047G01N3/40G01N3/56G01N21/84G01N23/20G01N23/2055G01N23/2251G01N2021/8477G01N2203/001G01N2203/0076G01N2203/0641
Inventor 王志华鹿骁阳赵雪勃许剑刘金海
Owner TIANJIN UNIVERSITY OF TECHNOLOGY