A Corrosion Appearance Method of Austenite Grain Size in High Strength Steel
A steel austenite and corrosion display technology, which is applied in the field of corrosion display of high-strength steel austenite grain size, can solve problems such as failure, unclear technical requirements, and inability to correctly grade, etc., to achieve a simple method and clear display Effect
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Embodiment 1
[0044] (1) Use an electric furnace to smelt the raw materials to ensure that the carbon content in the material at the end of the smelting is less than 0.28%;
[0045] (2) sequentially carrying out ladle refining, vacuum degassing, continuous casting, rolling, and dehydrogenation treatment on the smelted product obtained in step (1) to obtain a billet; wherein, the ladle refining time is greater than 30min; the vacuum degassing time is greater than 20min; the pouring speed of continuous casting is 0.5~0.7m / min; in the rolling process, the material should be heated to above 1150℃, and the rolling speed should be controlled to ensure that the final rolling temperature is greater than 950℃; the temperature of dehydrogenation treatment is 650℃ ; Obtain the blank material (percent by weight) of following chemical composition after dehydrogenation treatment finishes:
[0046] C 0.27%, Si 0.23%, Mn 0.87%, P 0.006%, S 0.003%, Cr 1.52%, Ni 1.46%, Mo 0.24%, Cu 0.07%, Al 0.028%, N 0.013%...
Embodiment 2
[0052] (1) Take the blank obtained in step (2) of Example 1 as a sample, put it into a heating furnace, heat it at a constant temperature of 890±10° C. for 1 hour, take it out and quickly quench it in water.
[0053] (2) The quenched samples are ground and polished in turn.
[0054] (3) Take 80 mL of water to prepare a saturated picric acid solution, and add 3 drops of hydrochloric acid into it to obtain a corrosive agent.
[0055] (4) Put the sample treated in step (2) into a fresh etchant at 85° C. for 9 minutes. During the corrosion process of the entire sample, it is necessary to continuously wipe with a non-woven fabric to prevent corrosion products from accumulating and corroding the metallographic structure in some areas. After the corrosion process was completed, the samples were taken out, rinsed with absolute ethanol and dried.
[0056] (5) Under the metallographic microscope, observe the grain size and grain boundary of the sample, and take pictures and record. Th...
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