CN105865882A - Etching method of corrosion agent for displaying crystal boundary of quenched and tempered low-alloy chrome molybdenum steel austenite crystal grains - Google Patents
Etching method of corrosion agent for displaying crystal boundary of quenched and tempered low-alloy chrome molybdenum steel austenite crystal grains Download PDFInfo
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention provides an etching method of a corrosion agent for displaying the crystal boundary of quenched and tempered low-alloy chrome molybdenum steel austenite crystal grains. The method comprises the following steps: preparing the corrosion agent; putting absorbent cotton in a glass dish containing the corrosion agent to make the absorbent cotton adsorb the corrosion agent; cleaning a polished low-alloy chrome molybdenum steel sample, blowing the sample until the sample is dry, immersing the dry sample in the corrosion agent, arranging the immersed sample on the absorbent cotton in a manner that the polished surface of the sample is downward, immersing for 10-15min, taking out the sample, cleaning the sample with clear water, cleaning the sample with anhydrous ethanol, and blowing the cleaned sample until the sample is dry; and rating the grain size of the quenched and tempered low-alloy chrome molybdenum steel austenite crystal grains under a microscope. The method has the advantages of simple preparation of the corrosion agent, no need of water bath heating, realization of large-batch evaluation of the grain size grade in 10-15min, safe operation, and high convenience.
Description
Technical field
The present invention relates to a kind of metallographic etching agent, in particular it relates to a kind of etching method showing quality adjustment condition low-alloy chrome-molybdenum steel austenite crystal grain boundary corrosion agent.
Background technology
In steel, grain size is a key character of mark Steel Properties, and it significantly affects the impact flexibility of steel, intensity, plasticity and Cutting free processing characteristics etc..Therefore detection austenite grain size has great importance.
Quenched and tempered state its metallographic structure of low-alloy chrome-molybdenum steel mostly is tempered sorbite, sometimes has a part tempering bainite.Low-alloy chrome-molybdenum steel autstenitic grain size for quality adjustment condition is evaluated at present, the corrosive agent used is containing picric solution, including picral and the picric acid aqueous solution as corrosive agent, simultaneously plus other reagent of appropriate dodecyl sodium sulfate or washing agent etc..
Picric acid, 2.4.6-trinitrophenol is the one of explosive, and abridge TNP, PA, is the crystallization of yellowish under pure substance room temperature, and bitter is poisonous, has violent explosion, has the biggest potential safety hazard.It manufactures, sell, buy, use, hold, store, transport and all must follow strictly explosive management rule, belongs to controlled drug.For safety and be prone to buy angle, select do not use picric corrosive agent to be just particularly important to corrode autstenitic grain size.
Summary of the invention
The shortcoming using picric acid existence in view of above-mentioned existing grain boundary corrosion agent, it is an object of the invention to provide a kind of etching method showing quality adjustment condition low-alloy chrome-molybdenum steel austenite crystal grain boundary corrosion agent, this corrosive agent does not use picric acid, so that crystal boundary in the low-alloy chrome-molybdenum steel tissue of quality adjustment condition is clearly continuous, but will not make again simultaneously metallographic structure evident from.
For achieving the above object, the technical scheme is that a kind of etching method showing quality adjustment condition low-alloy chrome-molybdenum steel austenite crystal grain boundary corrosion agent of offer, wherein: the method sequentially includes the following steps:
The first step, the preparation of corrosive agent, described corrosive agent proportioning is: sulfosalicylic acid 8-15g, water 100mL, 0.1-1mL mass percent concentration 4% nitric acid alcohol, 0.2-5mL liquid detergent；First configuration quality percent concentration is the nitric acid alcohol of 4%, then according to 8-15g sulfosalicylic acid is dissolved in 100mL water by described corrosive agent ratio, stir, and pour in glass dish, add 0.2-5mL liquid detergent and the nitric acid alcohol of 0.1-1mL configuration；
Second step, puts into absorbent cotton in the glass dish hold corrosive agent, makes absorbent cotton adsorb corrosive agent；
3rd step, will polishing and polished low-alloy chrome-molybdenum steel sample, clean up and immerse in corrosive agent after drying up, its burnishing surface is placed on absorbent cotton down, soaks 10-15 minute, by sample taking-up by clean water totally, then with washes of absolute alcohol and dry up；
4th step, grades to the low-alloy chrome-molybdenum steel autstenitic grain size of quality adjustment condition under the microscope.
Beneficial effects of the present invention is as follows:
The etching method of the corrosive agent of the low-alloy chrome-molybdenum steel austenite grain boundary of modifier treatment of the present invention, its corrosive agent does not use picric acid, and takes sulfosalicylic acid that is safer and that be prone to buy as main additive.There is not the potential safety hazard of picric acid medicine, and prepare simplicity, it is not necessary to heating water bath, eliminate heating water bath equipment, etching time is short, it is only necessary to 10-15 minute, therefore can save cost and the time of half.The medicine configured can be placed in closed container preservation, directly pours in glass dish, soaked by sample 10-15 minute during corrosion, convenient and swift, is suitably applied production upper high-volume evaluation grain size number.The present invention is relative to existing corrosive agent, safer, and it is more convenient to operate.
Accompanying drawing explanation
Fig. 1 is the corrosive agent corrosion quality adjustment condition 26CrMo4 steel austenite grain boundary photo prepared in the example 1 of the present invention；
Fig. 2 is the corrosive agent corrosion quality adjustment condition 27CrMo47Vs steel austenite grain boundary photo prepared in the example 2 of the present invention；
Fig. 3 is the corrosive agent corrosion quality adjustment condition 27CrMo44s steel austenite grain boundary photo prepared in the example 3 of the present invention.
Detailed description of the invention
In conjunction with accompanying drawing, the present invention being shown, the etching method of the corrosive agent of quenched and tempered state low-alloy chrome-molybdenum steel autstenitic grain size is illustrated.
The etching method of the display quality adjustment condition low-alloy chrome-molybdenum steel austenite crystal grain boundary corrosion agent of the present invention, the method sequentially includes the following steps:
The first step, the preparation of corrosive agent, described corrosive agent proportioning is: sulfosalicylic acid 8-15g, water 100mL, 0.1-1mL mass percent concentration 4% nitric acid alcohol, 0.2-5mL liquid detergent；First configuration quality percent concentration is the nitric acid alcohol of 4%, then according to 8-15g sulfosalicylic acid is dissolved in 100mL water by described corrosive agent ratio, stir, and pour in glass dish, add 0.2-5mL liquid detergent and the nitric acid alcohol of 0.1-1mL configuration；
Second step, puts into absorbent cotton in the glass dish hold corrosive agent, makes absorbent cotton adsorb corrosive agent；
3rd step, will polishing and polished low-alloy chrome-molybdenum steel sample, clean up and immerse in corrosive agent after drying up, its burnishing surface is placed on absorbent cotton down, soaks 10-15 minute, by sample taking-up by clean water totally, then with washes of absolute alcohol and dry up；
4th step, grades to the low-alloy chrome-molybdenum steel autstenitic grain size of quality adjustment condition under the microscope.
Liquid detergent of the present invention includes following brand: white cat, the blue moon, carving board, vertical white, dab hand, strong, Amway etc..
Embodiment 1
The low-alloy chrome-molybdenum steel that this example uses material to be 26CrMo4, the mass percent of its composition is C 0.24%-0.27%, Si 0.23%-0.28%, Mn 0.89%-0.94%, Cr 0.84%-0.92%, Mo0.16%-0.19%.Modifier treatment.
The proportioning of metallographic etching agent is: sulfosalicylic acid 8g, water 100mL, the nitric acid alcohol 1mL, liquid detergent 0.5mL of mass percent 4%.
Carry out etch according to the following steps:
1. sample making: after using sample grinding machine to polish in the sample of well cutting, uses W2.5 antiscuffing paste to be polished, makes flour milling become the smooth mirror surface of no marking.
2. corrosive agent proportioning: first configuration quality percent concentration is the nitric acid alcohol of 4%, then 8g sulfosalicylic acid is dissolved in 100mL water, stir, it is poured in glass dish, it is added thereto to 1mL nitric acid alcohol (mass percent concentration is 4%), 0.5mL liquid detergent, puts into absorbent cotton the most wherein, allows absorbent cotton draw corrosive agent.
3. corrosion: by polishing and polished low-alloy chrome-molybdenum steel sample, clean up and immerse in corrosive agent after drying up, its detection faces is placed on absorbent cotton down, soak 10 minutes, then sample is taken out, clean the most then with washes of absolute alcohol and dry up by clean water, observe under microscope the most again.
Optical microphotograph Microscopic observation austenite structure is as shown in Figure 1.Can be seen that the austenite grain boundary of the 26CrMo4 steel of quenched and tempered state clearly displays, and organize and do not display.Grading according to standard GB/T6394-2002 " metal mean grain size assay method ", grain size number is 8.5 grades.
Embodiment 2
The low-alloy chrome-molybdenum steel that this example uses material to be 27CrMo47Vs, the mass percent of its composition is C 0.24%-0.27%, Si 0.23%-0.31%, Mn 0.40%-0.49%, Cr0.96%-1.01%, Mo0.74%-0.80%.Modifier treatment.
The proportioning of metallographic etching agent is: sulfosalicylic acid 10g, water 100mL, 0.5mL nitric acid alcohol (mass percent concentration is 4%), liquid detergent 1mL.
Carry out etch according to the following steps:
1. sample making: after using sample grinding machine to polish in the sample of well cutting, uses W2.5 antiscuffing paste to be polished, makes flour milling become the smooth mirror surface of no marking.
2. corrosive agent proportioning: first configuration quality percent concentration is the nitric acid alcohol of 4%, then 15g sulfosalicylic acid is dissolved in 100mL water, stir, it is poured in glass dish, it is added thereto to 0.5mL nitric acid alcohol (mass percent concentration is 4%), 1mL liquid detergent, puts into absorbent cotton the most wherein, allows absorbent cotton draw corrosive agent.
3. corrosion: by polishing and polished low-alloy chrome-molybdenum steel sample, cleans up and immerses in corrosive agent after drying up, and its burnishing surface is placed on absorbent cotton down, soak 15 minutes, then sample is taken out, clean the most then with washes of absolute alcohol and dry up by clean water, observe under the microscope.
Optical microphotograph Microscopic observation austenite structure is as shown in Figure 2.Can be seen that the austenite grain boundary of the 27CrMo47Vs steel of quenched and tempered state clearly displays, and organize and do not display.Grading according to standard GB/T6394-2002 " metal mean grain size assay method ", grain size number is 8.5 grades.
Embodiment 3
The low-alloy chrome-molybdenum steel that this example uses material to be 27CrMo44s, the mass percent of its composition is C 0.25%-0.28%, Si 0.21%-0.26%, Mn 0.62%-0.70%, Cr1.02%-1.10%, Mo0.40%-0.43%.Modifier treatment.
The proportioning of metallographic etching agent is: sulfosalicylic acid 10g, water 100mL, 0.3mL nitric acid alcohol (mass percent concentration is 4%), 1mL liquid detergent.
Carry out etch according to the following steps:
1. sample making: after using sample grinding machine to polish in the sample of well cutting, uses W2.5 antiscuffing paste to be polished, makes flour milling become the smooth mirror surface of no marking.
2. corrosive agent proportioning: first configuration quality percent concentration is the nitric acid alcohol of 4%, then 10g sulfosalicylic acid is dissolved in 100mL water, stir, it is poured in glass dish, it is added thereto to 0.3mL nitric acid alcohol (mass percent concentration 4%), 1mL liquid detergent, puts into absorbent cotton the most wherein, allows absorbent cotton draw corrosive agent.
3. corrosion: by polishing and polished low-alloy chrome-molybdenum steel sample, cleans up and immerses in corrosive agent after drying up, and its burnishing surface is placed on absorbent cotton down, soak 15 minutes, then sample is taken out, clean the most then with washes of absolute alcohol and dry up by clean water, then examine under a microscope.
Optical microphotograph Microscopic observation austenite structure is as shown in Figure 3.Can be seen that the austenite grain boundary of the 27CrMo44s steel of quenched and tempered state clearly displays, and organize and do not display.Grading according to standard GB/T6394-2002 " metal mean grain size assay method ", grain size number is 8.5 grades.
Claims (1)
1. the leaching showing quality adjustment condition low-alloy chrome-molybdenum steel austenite crystal grain boundary corrosion agent
Etching method, is characterized in that: the method sequentially includes the following steps:
The first step, the preparation of corrosive agent, described corrosive agent proportioning is: sulfosalicylic acid 8-15g,
Water 100mL, 0.1-1mL mass percent concentration 4% nitric acid alcohol, 0.2-5mL liquid detergent；
First configuration quality percent concentration is the nitric acid alcohol of 4%, then according to described corrosive agent
8-15g sulfosalicylic acid is dissolved in 100mL water by ratio, stirs, and falls
Enter in glass dish, add 0.2-5mL liquid detergent and the nitric acid alcohol of 0.1-1mL configuration；
Second step, puts into absorbent cotton in the glass dish hold corrosive agent, makes absorbent cotton adsorb
Corrosive agent；
3rd step, by polishing and polished low-alloy chrome-molybdenum steel sample, cleans up and dries up
In rear immersion corrosive agent, its burnishing surface is placed on absorbent cotton down, soaks 10-15 minute,
Sample taking-up is clean by clean water, then with washes of absolute alcohol and dry up；
4th step, under the microscope the low-alloy chrome-molybdenum steel autstenitic grain size to quality adjustment condition
Grade.
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Cited By (4)
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| CN106756510A (en) * | 2017-01-03 | 2017-05-31 | 华东交通大学理工学院 | A kind of etchant for showing low-alloy wear-resistant steel original austenite crystal prevention and its application |
| CN108760439A (en) * | 2018-07-25 | 2018-11-06 | 中南大学 | A kind of metallographic sample preparation method of CrMo steel |
| CN110132962A (en) * | 2019-04-24 | 2019-08-16 | 东方电气集团东方锅炉股份有限公司 | A kind of original austenite crystal prevention display methods of boiler and pressure vessel tempering bainite steel |
| CN117845217A (en) * | 2024-03-07 | 2024-04-09 | 内蒙古矽能电磁科技有限公司 | Corrosion liquid and corrosion method for displaying prior austenite grain boundary of oriented silicon steel |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106756510A (en) * | 2017-01-03 | 2017-05-31 | 华东交通大学理工学院 | A kind of etchant for showing low-alloy wear-resistant steel original austenite crystal prevention and its application |
| CN108760439A (en) * | 2018-07-25 | 2018-11-06 | 中南大学 | A kind of metallographic sample preparation method of CrMo steel |
| CN110132962A (en) * | 2019-04-24 | 2019-08-16 | 东方电气集团东方锅炉股份有限公司 | A kind of original austenite crystal prevention display methods of boiler and pressure vessel tempering bainite steel |
| CN117845217A (en) * | 2024-03-07 | 2024-04-09 | 内蒙古矽能电磁科技有限公司 | Corrosion liquid and corrosion method for displaying prior austenite grain boundary of oriented silicon steel |
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Effective date of registration: 20190621 Address after: No. 396 Jintang Highway, Dongli District, Tianjin 300301 Patentee after: Tianjin Steel Tube Manufacturing Co., Ltd. Address before: No. 396 Jintang Highway, Dongli District, Tianjin 300301 Patentee before: Tianjin Steel Pipe Group Co., Ltd. |
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