CN105738272A - Method for simply and conveniently analyzing proportion between two phase ingredients of 1.4460 duplex stainless steel - Google Patents
Method for simply and conveniently analyzing proportion between two phase ingredients of 1.4460 duplex stainless steel Download PDFInfo
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- CN105738272A CN105738272A CN201610114064.3A CN201610114064A CN105738272A CN 105738272 A CN105738272 A CN 105738272A CN 201610114064 A CN201610114064 A CN 201610114064A CN 105738272 A CN105738272 A CN 105738272A
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Abstract
The invention discloses a method for simply and conveniently analyzing the proportion between two phase ingredients of 1.4460 duplex stainless steel. The method comprises the steps of sample preparation, metallographic etching, microstructure photograph collection, image processing and two phase ingredient calculation, so as to obtain the proportion between a ferrite phase and an austenite phase. According to metallographic etching dyeing and image binaryzation, fast analysis and calculation of proportion between the two phases of a 1.4460 duplex stainless steel cast structure is realized, the analyzing is simply and conveniently, the analyzing result is precise, the test cost is low, the comparability, the reproducibility and the test efficiency are high, and the problems of relative low comparability, reproducibility, precision and efficiency, and high cost are effectively solved.
Description
Technical field
The present invention relates to the simple analyzing method of a kind of 1.4460 biphase component ratios of two phase stainless steel, belong to metallographic analysing method field.
Background technology
1.4460 two phase stainless steels are a kind of ferrite austenite two phase stainless steels, have higher intensity, plasticity and toughness good, and corrosion resistance is strong, it is common to be applied to the industry-by-industries such as space flight and aviation, electric power, petrochemistry, boats and ships, machinery, electronics, environmental protection.1.4460 two phase stainless steel as cast condition phase constituent content are the intrinsic factor affecting its foundry goods serviceability.Foundry Production usually needs two-phase proportion in detection two-phase stainless steel casting, for forming technology and heat treated research thereof with optimize and provide foundation.
Existing analysis method has chemical analysis Atlas Method, method of magnetic and metallographic method.Chemical analysis Atlas Method belongs to semiquantitative method, and measurement error is bigger.Method of magnetic measurement result comparability, repeatability and accuracy are poor, perform standard strict, are only applicable to the mensuration of stainless steel weld joint metal material.Metallographic method departure work again Quantitative metallography and image analyzer measure metallographic method.Manual Quantitative metallography not only efficiency is low but also poor accuracy, is almost eliminated；Image analyzer measures metallographic method needs to buy image analyzer and the special-purpose software of high price.
Summary of the invention
The technical problem to be solved in the present invention is: provides the simple analyzing method of a kind of 1.4460 biphase component ratios of two phase stainless steel, analyzes simple and convenient, analyzes result accurate, experimentation cost is low, comparability and favorable reproducibility, test efficiency is high, to solve problems of the prior art.
The technical scheme that the present invention takes is: the simple analyzing method of a kind of 1.4460 biphase component ratios of two phase stainless steel, comprises the following steps:
(1) rustless steel cut and be processed into rustless steel sample；
(2) sightingpiston of step (1) rustless steel sample is ground and machine glazed finish, then washes away the spot of sightingpiston with ethanol；
(3) preparation metallographic etching agent, adopts caustic that the rustless steel sample sightingpiston after grinding in step (2) and polishing is corroded, then uses computer-shape metallurgical microscope that corrosion area is taken pictures, obtain metallograph；
(4) ferrite and austenite phase in 1.4460 two phase stainless steel metallographs is found by metallurgical microscope, metallograph is carried out binary conversion treatment, and calculate austenite phase region area ratio γ, ratio of ferrite α=1-γ in metallograph, and obtain the value w1 of α/γ；
(5) different corrosion location photos are calculated by step 4) method respectively, and obtain the meansigma methods repeatedly calculated, i.e. w=(w1+w2+w3 ...+wn)/n is the biphase component ratio of ferritic-austenitic in two phase stainless steel.
In above-mentioned steps (1), sample is extracted from mo(u)lded piece, turning removes sample epidermis black oxide, being processed into cross section is Φ 20mm pole, Wire EDM pole is several sections, and every segment length is 12mm, it should be noted that use carbide tool during turning, the little feeding of the slow-speed of revolution also cools down in time, it is prevented that viscous cutter and temperature raise and cause sample tissue to change.
In above-mentioned steps (2), abrasive machine is destroyed burr and the wedge angle of sample, sample sightingpiston is roughly ground.
In above-mentioned steps (2), on the sand paper of 240Cw, 500Cw, 1000Cw, 2000Cw, sightingpiston is carried out fine grinding in order.
In above-mentioned steps (2), machine glazed finish sightingpiston, until it reaches mirror effect, it is virtually free from obvious cut, buffing machine uses velveting, polishing agent uses aluminum oxide suspension.
In above-mentioned steps (2), use dropper to draw the spot of alcohol rinse sightingpiston, and dry up with hair-dryer.
In above-mentioned steps (3), metallographic etching agent component is: ferric sesquichloride 5g, hydrochloric acid 45ml, water 100ml.
In above-mentioned steps (3), use absorbent cotton to dip metallographic etching agent described in claim 7 and be paved with rustless steel sightingpiston, rinsing sightingpiston with clear water at once after corrosion 45s-60s, different corrosion locations are carried out observation and take pictures by be seen dried use computer-shape metallurgical microscope.
Being calculated as of austenitic phase fraction in above-mentioned steps (4): the area accumulation of the point of black, it is simply that the area of austenite phase, is austenite phase proportion divided by the sightingpiston gross area.
Beneficial effects of the present invention: compared with prior art, the present invention is processed by etching pit dyeing and image binaryzation, achieve the quick analytical calculation of 1.4460 two phase stainless steel as-cast structure two-phase proportions, analyze simple and convenient, analysis result is accurate, and experimentation cost is low, comparability and favorable reproducibility, test efficiency is high, efficiently solves the comparability, the repeatability that exist in prior art and accuracy is poor and inefficiency and the high problem of cost.
Accompanying drawing explanation
Fig. 1 is the 1.4460 rustless steel sample outward appearances of the present invention；
Fig. 2 is the metallograph of the computer-shape metallurgical microscope shooting of the present invention；
Fig. 3 is Fig. 2 metallograph after image procossing.
Detailed description of the invention
Below in conjunction with accompanying drawing and specific embodiment, invention is described further.
Embodiment 1: the simple analyzing method of a kind of 1.4460 biphase component ratios of two phase stainless steel, comprises the following steps:
Step 1: rustless steel sample is cut and processes, one piece is cut out as sample base from the foundry goods cross gate that material trademark is 1.4460, sample epidermis oxide is removed in turning, sample is cut into several sections by Wire EDM, every section of rustless steel sample apparent size is Φ 20mm × 12mm, as shown in Figure 1 three-dimensional structure diagram；
Step 2: the sightingpiston of the rustless steel sample described in step 1 is ground and machine glazed finish, then the spot observing surface is washed away with ethanol, use the sand paper of abrasive machine and 240Cw, 500Cw, 1000Cw, 2000Cw that sample sightingpiston is roughly ground and fine grinding respectively successively, and sightingpiston is carried out machine glazed finish as polishing agent by addition aluminum oxide suspension on buffing machine, polishing effect is advisable to reach minute surface, perusal is without obvious cut, finally draw the spot of alcohol rinse sightingpiston with dropper, and dry up with hair-dryer；
Step 3: preparation metallographic etching agent, rustless steel sample sightingpiston after polishing in step 2 is corroded, then use computer-shape metallurgical microscope that corrosion area is taken pictures, obtain metallograph, use dropper, graduated cylinder, measuring cup, electronic balance, spoon, according to ferric sesquichloride 5g, hydrochloric acid 45ml, the formula preparation metallographic etching agent of water 100ml, this metallographic etching agent appropriate is dipped in rustless steel sightingpiston with absorbent cotton, sightingpiston is rinsed with clear water at once after corrosion 45s-60s, different corrosion locations are carried out observation and take pictures by be seen dried use computer-shape metallurgical microscope, microscope magnification is 400 ×, such as the metallograph that Fig. 2 is the computer-shape metallurgical microscope shooting of sightingpiston position；
Step 4: by the image processing function of matlab software, metallograph carried out binary conversion treatment, and calculate austenite phase region area ratio γ, ratio of ferrite α=1-γ in photo, and obtain the value w1 of α/γ.Metallograph after process is as it is shown on figure 3, by calculating, draw w1=61:39；
Step 5: different corrosion location photos are calculated wn by step 4) method respectively, the present embodiment chooses total five group, other four groups of austenites and ferrite biphase carry out ratio result of calculation be: w2=60:40, w3=w4=57:43 and w5=55:45, taking its arithmetic mean number, obtaining ferritic-austenitic two-phase proportion in this sample is w=58:42.
The above; it is only the specific embodiment of the present invention; but protection scope of the present invention is not limited thereto; any those familiar with the art is in the technical scope that the invention discloses; change can be readily occurred in or replace; all should being encompassed within protection scope of the present invention, therefore, protection scope of the present invention should be as the criterion with described scope of the claims.
Claims (9)
1. the simple analyzing method of the biphase component ratio of two phase stainless steel, it is characterised in that: comprise the following steps:
(1) rustless steel cut and be processed into rustless steel sample；
(2) sightingpiston of step (1) rustless steel sample is ground and machine glazed finish, then washes away the spot of sightingpiston with ethanol；
(3) preparation metallographic etching agent, adopts metallographic etching agent that the rustless steel sample sightingpiston after grinding in step (2) and polishing is corroded, then uses computer-shape metallurgical microscope that corrosion area is taken pictures, obtain metallograph；
(4) ferrite and austenite phase in 1.4460 two phase stainless steel metallographs is found by metallurgical microscope, metallograph is carried out binary conversion treatment, and calculate austenite phase region area ratio γ, ratio of ferrite α=1-γ in metallograph, and obtain the value w1 of α/γ；
(5) different corrosion location photos are calculated by step 4) method respectively, and obtain the meansigma methods repeatedly calculated, i.e. w=(w1+w2+w3 ...+wn)/n is the biphase component ratio of ferritic-austenitic in two phase stainless steel.
2. the simple analyzing method of a kind of 1.4460 biphase component ratios of two phase stainless steel according to claim 1, it is characterized in that: in described step (1), sample is extracted from mo(u)lded piece, turning removes sample epidermis black oxide, being processed into cross section is Φ 20mm pole, and Wire EDM pole is several sections, and every segment length is 12mm, should using carbide tool during turning, the little feeding of the slow-speed of revolution also cools down in time.
3. the simple analyzing method of a kind of 1.4460 biphase component ratios of two phase stainless steel according to claim 1, it is characterised in that: in described step (2), abrasive machine is destroyed burr and the wedge angle of sample, sample sightingpiston is roughly ground.
4. the simple analyzing method of a kind of 1.4460 biphase component ratios of two phase stainless steel according to claim 1, it is characterised in that: in described step (2), on the sand paper of 240Cw, 500Cw, 1000Cw, 2000Cw, sightingpiston is carried out fine grinding in order.
5. the simple analyzing method of a kind of 1.4460 biphase component ratios of two phase stainless steel according to claim 1, it is characterized in that: in described step (2), machine glazed finish sightingpiston, until reaching mirror effect, it is virtually free from obvious cut, using velveting on buffing machine, polishing agent uses aluminum oxide suspension.
6. the simple analyzing method of a kind of 1.4460 biphase component ratios of two phase stainless steel according to claim 1, it is characterised in that: in described step (2), use dropper to draw the spot of alcohol rinse sightingpiston, and dry up with hair-dryer.
7. the simple analyzing method of a kind of 1.4460 biphase component ratios of two phase stainless steel according to claim 1, it is characterised in that: in described step (3), metallographic etching agent component is: ferric sesquichloride 5g, hydrochloric acid 45ml, water 100ml.
8. the simple analyzing method of a kind of 1.4460 biphase component ratios of two phase stainless steel according to claim 7, it is characterized in that: in described step (3), use absorbent cotton to dip metallographic etching agent described in claim 7 and be paved with rustless steel sightingpiston, rinsing sightingpiston with clear water at once after corrosion 45s-60s, different corrosion locations are carried out observation and take pictures by be seen dried use computer-shape metallurgical microscope.
9. the simple analyzing method of a kind of 1.4460 biphase component ratios of two phase stainless steel according to claim 1, it is characterized in that: being calculated as of austenitic phase fraction in described step (4): the area accumulation of the point of black, it is exactly the area of austenite phase, is austenite phase proportion divided by the sightingpiston gross area.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106248460A (en) * | 2016-10-09 | 2016-12-21 | 江苏科技大学 | A kind of assay method of two phase stainless steel phase content |
| CN106353321A (en) * | 2016-11-16 | 2017-01-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for characterizing average thickness of alpha polluted layer of cylindrical titanium-alloy sample |
| CN110987991A (en) * | 2019-11-18 | 2020-04-10 | 上海航天精密机械研究所 | Method for counting ultra-fine ferrite phase in austenitic stainless steel welding seam |
| CN113944058A (en) * | 2021-09-26 | 2022-01-18 | 江苏亚盛金属制品有限公司 | High-strength fatigue-resistant duplex stainless steel wire rope and research method thereof |
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| JPH0634624A (en) * | 1992-07-14 | 1994-02-10 | Hitachi Ltd | Sensitization detection of austenitic stainless steel |
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| CN103712988A (en) * | 2013-12-11 | 2014-04-09 | 攀钢集团攀枝花钢铁研究院有限公司 | Quantitative method for measuring massive martensite content in low carbon steel |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106248460A (en) * | 2016-10-09 | 2016-12-21 | 江苏科技大学 | A kind of assay method of two phase stainless steel phase content |
| CN106353321A (en) * | 2016-11-16 | 2017-01-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for characterizing average thickness of alpha polluted layer of cylindrical titanium-alloy sample |
| CN110987991A (en) * | 2019-11-18 | 2020-04-10 | 上海航天精密机械研究所 | Method for counting ultra-fine ferrite phase in austenitic stainless steel welding seam |
| CN113944058A (en) * | 2021-09-26 | 2022-01-18 | 江苏亚盛金属制品有限公司 | High-strength fatigue-resistant duplex stainless steel wire rope and research method thereof |
| CN113944058B (en) * | 2021-09-26 | 2023-06-16 | 江苏亚盛金属制品有限公司 | Research method based on high-strength fatigue-resistant duplex stainless steel wire rope and steel wire rope |
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Application publication date: 20160706 |