Spring steel austenite grain display method
A technology for displaying austenite grains and methods, which is applied in the preparation of test samples, instruments, and measuring devices, and can solve the problems of easy erosion of intragranular structures and unclear display of grain boundaries, etc.
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[0028] (2) Preparation of metallographic sample: the cross section of the hardened sample is selected in the rolling direction for cutting and inlaying; then successively use metallographic water sandpaper of 80#, 200#, 400#, 800#, 1000#, 1500# Grind from coarse to fine, and then polish with 2.5um diamond polishing agent;
[0029] (3) Configuration of corrosion solution: Add 50ml of deionized water, 2-2.5g of picric acid, 1.5-2g of Seagull brand shampoo, and 1g of iron oxide scale produced by Gaoxian Steel Rolling Plant into a 70°C water bath beaker, stir evenly, and configure as Erosion fluid;
[0030] (4) Erosion of the metallographic sample: the metallographic sample is taken out after standing in the etching solution for 30-60 seconds, cleaned and dried, and the grain size can be observed with a metallographic microscope.
Embodiment 1
[0032] The detection and display method of the spring steel austenite grain is specifically as follows:
[0033] The chemical composition of 55SiCrA sample is (wt): C 0.56%, Si 1.45%, Mn 0.65%, Cr 0.65%, P0.011%, S 0.007%, and the rest are Fe and unavoidable impurity elements.
[0034] (1) Heat the sample to 860°C for 30 minutes, put it into fast-flowing water; after cooling, temper the sample at 550°C for 17 hours, cool it to 350°C with the furnace, and then air cool to room temperature;
[0035] (2) Select the cross-section of the hardened sample in the rolling direction to cut and inlay; then use 80#, 200#, 400#, 800#, 1000#, 1500# metallographic water sandpaper to grind from coarse to fine, Finally, polish with 2.5um diamond polishing agent;
[0036](3) Add 50ml of deionized water, 2.2g of picric acid, 1.8g of Seagull brand shampoo, and 1g of iron oxide scale produced by Gaoxian Steel Rolling Plant into a 70°C water bath beaker, stir well, and prepare an erosion solution;...
Embodiment 2
[0039] The detection and display method of the austenite grains of the spring steel is specifically as follows.
[0040] The chemical composition of 55SiCrA sample is (wt): C 0.55%, Si 1.47%, Mn 0.67%, Cr 0.64%, P0.012%, S 0.008%, and the rest are Fe and unavoidable impurity elements.
[0041] (1) Heat the sample to 860°C for 30 minutes, put it into fast-flowing water; after cooling, temper the sample at 550°C for 13 hours, cool it to 350°C with the furnace, and then air cool to room temperature;
[0042] (2) Select the cross-section of the hardened sample in the rolling direction to cut and inlay; then use 80#, 200#, 400#, 800#, 1000#, 1500# metallographic water sandpaper to grind from coarse to fine, Finally, polish with 2.5um diamond polishing agent;
[0043] (3) Add 50ml of deionized water, 2.1g of picric acid, 2g of Seagull brand shampoo, and 1g of iron oxide scale produced by Gaoxian Steel Rolling Plant into a water bath beaker at 70°C, stir evenly, and prepare an erosi...
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