Method for accurately measuring and reducing proportion and distribution of proeutectoid cementite
A technology of proeutectoid cementite and cementite, which is applied in the preparation of test samples, analytical materials, and measuring devices, etc., can solve the problems of unfriendly environment, complicated reagent configuration, and use restrictions
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Embodiment 1
[0049] The chemical composition in the sample of this example is: by weight percentage, C: 1.0%, Si: 0.25%, Mn: 0.9%, Cr: 0.4%, V: 0.08%, S: 0.006%, P: 0.010%, The rest is Fe and unavoidable impurities. Specific steps are as follows:
[0050] (1) Sample preparation. Saw a section (300mm) from an industrially produced hot-rolled pearlitic rail, and then cut a sample (30x15x20 mm) by wire cutting at the center of the rail head (30mm is the rolling direction of the rail, and 30mm is the distance from the surface of the rail head to the bottom surface of the sample). The cut sample was ultrasonically cleaned in acetone for 3 minutes, and then the observation surface (30x15 mm) was roughly ground to 1200# sandpaper and polished.
[0051] (2) Erosion. 96% (volume fraction) of absolute ethanol and 4% nitric acid are made into nitric acid alcohol solution. Pick up the sample with tweezers, with the polished side facing upright, and shake the sample slightly after completely invadi...
Embodiment 2
[0054] The chemical composition in the sample of this example is: by weight percentage, C: 0.88%, Si: 0.55%, Mn: 0.5%, Cr: 0.1%, V: 0.04%, S: 0.005%, P: 0.010%, The rest is Fe and unavoidable impurities. Specific steps are as follows:
[0055] (1) Sample preparation. Saw a section (300mm) from an industrially produced hot-rolled pearlitic rail, and then cut a sample (30x15x20 mm) by wire cutting at the center of the rail waist (20mm is the rolling direction of the rail, and 30mm is the rail height direction). The cut sample was ultrasonically cleaned in acetone for 3 minutes, and then the observation surface (30x15 mm) was roughly ground to 1200# sandpaper and polished.
[0056] (2) Erosion. 96% (volume fraction) of absolute ethanol and 4% nitric acid are made into nitric acid alcohol solution. Pick up the sample with tweezers, with the polished side facing upright, and shake the sample slightly after completely invading the solution. After corroding at room temperature (...
Embodiment 3
[0059] The chemical composition in the sample of this example is: by weight percentage, C: 1.0%, Si: 0.25%, Mn: 0.9%, Cr: 0.4%, V: 0.08%, S: 0.006%, P: 0.010%, The rest is Fe and unavoidable impurities. Specific steps are as follows:
[0060] (1) heat treatment. A section (300 mm) was cut from an industrially produced hot-rolled pearlitic rail, and subjected to austenitizing heat treatment at a holding temperature of 1050° C. for a holding time of 30 minutes. After the rail is taken out, it is naturally air-cooled to about 800°C, and the tread of the rail head and both sides are subjected to online air spray heat treatment under a certain wind pressure, and the air spray time is 2 minutes. After blasting, the rails are naturally cooled to room temperature.
[0061] (2) Sample preparation. Cut a section (300mm) from the heat-treated pearlitic rail, and then cut a sample (30x15x20 mm) by wire cutting at the center of the rail head (30mm is the rolling direction of the rail, ...
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