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Method for displaying M/A island structures inside pipeline steel
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A display method and technology for pipeline steel, which are applied in measuring devices, instruments, and optical devices, etc., can solve the problems of complicated operation and expensive microscope, and achieve the effect of simple operation and shortened corrosion time.
Active Publication Date: 2013-11-13
BC P INC CHINA NAT PETROLEUM CORP +1
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However, its operation is complicated, and it needs to be used with laserconfocalmicroscope, and the microscope is relatively expensive, which belongs to high-end and unconventional equipment
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[0054] Use 120#, 360#, 600#, 800#, 1000# metallographic water sandpaper for rough grinding and fine grinding for X70 samples respectively. After replacing the fine sandpaper, the grinding direction should be 90° to the previous direction until the previous grinding marks are worn off. Afterwards, the samples were polished with 2.5 μm and 1.5 μm diamond spray polishing agents for 3 minutes respectively. At this time, the test surface of the sample becomes a mirror surface without scratches.
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Abstract
The invention discloses a method for displaying M / A island structures inside pipeline steel, and belongs to the technical field of metallographic phase structure displaying and quantifying. Specifically, A sample is grinded and polished into a mirror face to be used later; 1g sodium metabisulfite is added into 100ml distilled water inside a beaker; 3.65g picric acid and 0.65g sodiumhydroxide are added into 100ml absolute ethyl alcohol; the two kinds of solutions are mixed according to the proportion of 3: 2 and are heated and stirred to obtain the improved stainingreagent; 2-4% of nitric acid ethyl alcohol solution is used for slightly corroding the prepared sample, and the sample is placed into the stainingreagent to be immersed for 120-240 seconds and then is washed clean through the ethyl alcohol and is blown to be dried; an M / A island presents bright white and is very different from the surrounding structures in the gray level. The method is easy to operate, the corrosion time is short, and the area content, the size, the shape and other characteristic parameters of the M / A island in the structures can be fast, accurately and quantificationally analyzed through metallographic phase software.
Description
technical field [0001] The invention relates to the technical field of metallographic structure display and quantification, and specifically provides a method for displaying the M / A island structure in pipeline steel. Background technique [0002] The strength and toughness of steel are closely related to its microstructure. With the improvement of strength and toughness, the microstructure of pipeline steel gradually evolves from the initial ferrite-pearlite (PF-P) type to granular bainite (GB) type. The remarkable feature of the granular bainite structure is the distribution of martensite and retained austenite (M / A) islands on the high-density dislocation iron matrix. M / A islands are an important component of granular bainite. As the second hard phase in the microstructure, the characteristic parameters such as the area content, size, and shape of M / A islands have a great influence on the strength and toughness of pipeline steel. Therefore, the quantitative analysis of...
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