Nickel-based alloy as-cast grain corrosion method for ultra-supercritical turboset
A technology of nickel-based alloys and steam turbines, which is applied in the field of metallographic detection and corrosion, can solve the problems that it is difficult to display the as-cast grain boundary, the morphology of as-cast grains, the average size of grains, and the change of grains. Good effect, good reproducibility and high stability
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Embodiment 1
[0024] The present embodiment uses this method to corrode the as-cast grain size of the modified IN617 nickel-based alloy, and the specific steps are as follows:
[0025] Step 1: Prepare the metallographic detection sample of the modified IN617 alloy
[0026] The sample is subjected to mechanical rough grinding, fine grinding, polishing, cleaning and drying according to the conventional preparation method of metallographic samples;
[0027] Step 2: Oxidize the polished sample
[0028] Raise the temperature of the ordinary heat treatment furnace to 600°C, put the polished sample into the furnace, keep it warm for 2 hours, and then take it out of the furnace to air cool, and pay attention to the protection of the polished surface during the heat treatment process;
[0029] Step 3: Preparation of copper sulfate corrosion solution
[0030] According to the ratio of copper sulfate pentahydrate: water: concentrated hydrochloric acid: concentrated sulfuric acid = 20g: 80ml: 150ml: ...
Embodiment 2
[0034] The present embodiment uses this method to corrode the as-cast grain size of the modified IN706 nickel-based alloy, and the specific steps are as follows:
[0035] Step 1: Prepare the metallographic detection sample of the modified IN706 alloy
[0036] The sample is subjected to mechanical rough grinding, fine grinding, polishing, cleaning and drying according to the conventional preparation method of metallographic samples;
[0037] Step 2: Oxidize the polished sample
[0038] Raise the temperature of the ordinary heat treatment furnace to 800°C, put the polished sample into the furnace, keep it warm for 3 hours, and then take it out of the furnace to air cool, and pay attention to the protection of the polished surface during the heat treatment;
[0039] Step 3: Preparation of copper sulfate corrosion solution
[0040] According to the ratio of copper sulfate pentahydrate: water: concentrated hydrochloric acid: concentrated sulfuric acid = 20g: 80ml: 150ml: 5ml, add...
Embodiment 3
[0044] Present embodiment is to adopt this method to corrode the as-cast grain size of IN740 nickel-base alloy, and concrete steps are as follows:
[0045] Step 1: Prepare test samples of IN740 alloy
[0046] The sample is subjected to mechanical coarse grinding, fine grinding, polishing, cleaning and drying according to the conventional preparation method of metallographic samples;
[0047] Step 2: Oxidize the polished sample
[0048] Raise the temperature of the ordinary heat treatment furnace to 750°C, put the polished sample into the furnace, keep it warm for 2 hours, and then take it out of the furnace to air cool, and pay attention to the protection of the polished surface during the heat treatment;
[0049] Step 3: Preparation of copper sulfate corrosion solution
[0050] According to the ratio of copper sulfate pentahydrate: water: concentrated hydrochloric acid: concentrated sulfuric acid = 20g: 80ml: 150ml: 5ml, add water, concentrated sulfuric acid, copper sulfate...
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