METHOD FOR MEASURING GRAIN SIZE OF AUSTENITIC STAINLESS STEEL CONTAINING HIGH SILICON CONTENT
The present invention refers to a method measuring grain sizeutilitarian cone containing austenitic stainless determining are disclosed. Stainless steel iron rust well [sul[sul] made to contain a substantial portion of placed in the chromium steel are disclosed. The stainless steel metal tissue classification onto which a representative of an austenitic stainless steel are disclosed. According to size of the particles of an austenitic stainless steel in heat treatment history according to environment factors river kind austenitic has an unique factor determined by, the physical properties of a material in order to predict observation of the inside of analyzing grains are disclosed. On the other hand, adding a large amount of an austenitic stainless steel silicon hot oxidant properties for example recent existing good river kind automobile parts applied door etc. through the Internet. At least one component with an adhesive material in order to determine particle size size and distribution accomplishing a precise and rapid manner. The temperature detector, general corrosion conditions for austenitic stainless grains containing utilitarian conethe present it will dance undergoes no optical assay include determining (grain size) is strengthened because of the constant screen grain size disenable measurement (electron backscatter diffraction) (grain size) and determining grain size measuring process from work only EBSD. The, clear grain the present it will dance, this etc. novel corrosion method desired. One of the purposes of the present invention various, containing a number determining UGT under public affairsgrain sizeutilitarian cone austenitic stainless measuring method. The one aspect of the present invention, the steps of providing an austenitic stainless steel containing utilitarian cone specimen, said specimen nitric acid, acetic acid and hydrochloric acid aqueous solution including cutting, the surface chemically corrosion, chemically corrosion is charged into said holding unit is nitric acid, said buffer to sample electrode, voltage applied, the surface electrically corrosion, and said unit is electrically corrosion after washing, tissue containing a number determining step including measuring method observing utilitarian cone austenitic stainless grain sizeunder public affairs substrate. According to the present invention, reliably determining grain sizeutilitarian cone austenitic stainless containing measuring...copyright 2001. Method of corrosion by the holding unit is also 1a is by observation under an optical microscope (X200) corrosion [leyl[leyl] billets photograph and, in the embodiment according to the method of the present invention also 1b by observation under an optical microscope (X200) only one chemical corrosion specimen after application and photograph, in the embodiment according to one method of the present invention is also 1c after application by observation under an optical microscope (X200) specimen chemical corrosion and electric erosion of the photograph are disclosed. Hereinafter, the present invention is described therein that are directionally. First, an austenitic stainless steel containing utilitarian cone is applied to an entire specimen, said specimen nitric acid, acetic acid and hydrochloric acid aqueous solution including cutting, chemical surface temperature is as follows. The, alx vapourised hydrochloric acid is added to corrosion and nitric acid, acetic acid may suitable for guiding the uniform etch rate to obtain clear grains by adding substrate. According to one example, nitric acid, acetic acid and hydrochloric acid aqueous solution including, 100 ml water for 25 provided 125 ml of nitric acid, hydrochloric acid can be acetic acid and 25 provided 125 ml of 25 provided 125 ml comprising. If, when sufficiently the present it will dance 25 ml nitric acid content further comprises a step of not less than for a type, while, 125 ml exceeds the grain distortion can be caused due to df. If, when sufficiently the present it will dance 25 ml hydrochloric acid content further comprises a step of not less than for a type, while, 125 ml exceeds the grain distortion can be caused due to df. If, less than 25 ml acetic acid content may cause a decrease in corrosion rates and transmit power to the number of copied and displays data, while, exceeds the precipitate can be a spot by 125 ml. According to one example, nitric acid, acetic acid and hydrochloric acid aqueous solution including 20 a-40 °C temperature of implementation being. If, when the temperature is less than 20 °C is not for a type sufficiently the present it will dance further comprises a step of, while, 40 °C exceeds the surface unevenness is detected based disclosed. According to one example, nitric acid, acetic acid and hydrochloric acid aqueous solution including a specimen to be a dosing has input time is 6 - 8 minutes. If, when sufficiently the present it will dance input time 6 - 8 min. is not for a type further comprises a step of, while, due to 6 - 8 minutes and then df grain distortion can be caused. Next, chemically corrosion is charged into the holding unit is nitric acid, said buffer to sample electrode, applied voltage, electrically the surface corrosion as follows. The stage may be improved because of the chemical corrosion as well as the present the ratio which it will dance caused by pigmented developing step for reducing embodiment are disclosed. According to one example, an aqueous solution comprising water and nitrate can be 1:1 volume ratio of nitric acid. If, when the ratio thereof is not less than 1:1 for a type sufficiently the present it will dance further comprises a step of, while, 1:5 generates exceeds the surface unevenness, a deflection can be caused due to df. According to one example, the voltage applied sample 0. 3 - 0. 7V implementation being. If, its voltage 0. 3V when colored number is not less than for a type hereinafter for wetting ability, while, 0. 7V grain distortion exceeds the equipment disclosed. According to one example, be first day sample voltage applied time is 5 - 10. If, when time is 5 seconds or less is not for a type sufficiently the present it will dance further comprises a step of, while, due to df exceeds 10 seconds grain distortion can be caused. Next, the holding unit is electrically corrosion after washing, tissue observing other. The, fish using commercially available washing water and ethanol but, one composite number are not disclosed. On the other hand, tissue observations are a plurality of samples can be. Hereinafter, the present invention more specifically described in the embodiment through broadcast receiver. But, in the embodiment of the present invention is to exemplify only for more detailed, for limiting the range of the present invention will not be significantly different rights need to be disclosed. The matter of the present invention claim rights range determined by a rationally configured equipment therefrom liquid crystal structure therefor are disclosed. (In the embodiment) 40 ml distilled water to 25 ml nitric acid, hydrochloric acid and 18 ml 25 ml acetic acid etchant to prepare and mixing, a specimen mounting and polished steel including STS309 Si, the aqueous etchant prepared (25 °C) with respect to chemical corrosion in 6 minutes. Then, the holding unit is nitric acid aqueous solution (water: nitric acid=1:2) is charged into a chemical corrosion, sample buffer to said electrode, liver 0 10 seconds. 6V voltage applied, with respect to the electrical corrosion. Then, after washing the mixture of water and ethanol using, optical microscope holder of observed. The method of Figure 1 (a) of the holding unit by observation under an optical microscope (X200) [leyl[leyl] billets corrosion corrosion by photograph and, in the embodiment according to one method of the present invention after application of Figure 1 (b) is by observation under an optical microscope (X200) specimen only chemical corrosion and photograph, (c) of Figure 1 in the embodiment according to one method of the present invention is by observation under an optical microscope (X200) specimen after application chemical corrosion and electric erosion of the photograph are disclosed. When reference also 1, method of billets [leyl[leyl] corrosion by corrosion as compared to the holding unit, in the embodiment of the present invention is identifying clearly the present it will dancebecoming, 04 corroded according one can be produced. Furthermore, chemical corrosion method when applied colored phenomenon but only, without both chemical corrosion and electric erosion of the method further comprises a step of confirming the colored upon application and utilization can be. Table 1 per unit area for each corrosion method according to grain for counting result are disclosed. On the other hand, reliability evaluation or disperses grain number per unit area by an EBSD (electron backscatter diffraction) center for a long time. The reference to table 1, in the method in the present invention number by a result of the determination by EBSD can be almost similar measurement result is also used for value, through, when-in by the method in the present invention number, may be reliably measuring grain sizeutilitarian cone containing austenitic stainless determining can be converted. Disclosed is a method for measuring the grain size of austentic stainless steel containing the high silicon content, comprising the following steps: preparing austentic stainless steel specimens; inputting the specimens into an aqueous solution including nitric acid, acetic acid and hydrochloric acid and chemically corroding the surface thereof; inputting the chemically corroded specimens into a nitric acid solution, connecting an electrode to the specimens, applying voltage and electrically corroding the surface; and cleaning the electrically corroded specimens and observing tissue. COPYRIGHT KIPO 2017 The steps of providing a sample of an austenitic stainless steel containing utilitarian cone; said specimen nitric acid, acetic acid and hydrochloric acid aqueous solution including cutting, the surface chemically corrosion; chemically corrosion is charged into said holding unit is nitric acid, said buffer to sample electrode, voltage applied, the electrically corrosion surface; and said holding unit is electrically corrosion after washing, tissue observing step; determining a measuring method including austenitic stainless containing utilitarian conegrain size. According to Claim 1, said nitric acid, including acetic acid and hydrochloric acid aqueous solution, 100 ml water for 25 provided 125 ml of nitric acid, hydrochloric acid containing 25 provided 125 ml of acetic acid and 25 provided 125 ml utilitarian cone including austenitic stainless determining grain size measuring method. According to Claim 1, said nitric acid, acetic acid and hydrochloric acid aqueous solution including determining the temperature of the phosphorus containing 20 provided 40 °C utilitarian cone austenitic stainless grain size measuring method. According to Claim 1, said specimen insertion time is 6 - 8 minutes in chemically at the lower part of said measuring grain sizeutilitarian cone containing austenitic stainless determining method. According to Claim 1, including 1:1 volume ratio of said nitric acid aqueous solution is water and nitrate containing austenitic stainless determining measuring method to utilitarian conegrain size. According to Claim 1, said voltage applied to said electrically corrosion in the sample 0. 3 - 0. 7V in determining grain sizeutilitarian cone containing austenitic stainless measuring method. According to Claim 1, into a sample voltage applied time is 5 - 10 time of said electrically said utilitarian cone determining grain sizesuperhuman containing austenitic stainless measuring method. According to Claim 1, said specimen of an austenitic stainless steel measuring method determining grain size fish using water and ethanol is performed. Measuring method Number-of- the present the ratio which it will dance 1 2 3 4 5 Average Billets [leyl[leyl] corrosion 67 58 66 60 62 62. 6 57. 7% Chemical and electrical corrosion 109 106 110 106 107 107. 6 97. 7% EBSD 111 109 112 108 110 110 100% (reference)
