CN102965479A - Method for quickly preparing high-corrosion-resistance austenitic stainless steel surface layer - Google Patents
Method for quickly preparing high-corrosion-resistance austenitic stainless steel surface layer Download PDFInfo
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- CN102965479A CN102965479A CN2012105275764A CN201210527576A CN102965479A CN 102965479 A CN102965479 A CN 102965479A CN 2012105275764 A CN2012105275764 A CN 2012105275764A CN 201210527576 A CN201210527576 A CN 201210527576A CN 102965479 A CN102965479 A CN 102965479A
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Abstract
The invention relates to a method for quickly preparing a high-corrosion-resistance austenitic stainless steel surface layer. The method comprises the following steps in sequence: processing a stainless steel plate by a double-roller mill in a cold rolling way, and controlling the rolling reduction to 5 to 30%; transferring a sample in a high-frequency induction coil; adjusting the high-frequency induction output current, frequency and heating time to heat the surface of the material in a high-frequency induction way; and quickly transferring the sample into an ice-water mixture to implement water quench after the heating. By adopting the method, the control on the characteristic distribution of the grain boundary on the surface of the austenitic stainless steel can be realized, so that the inter-grain corrosion resistance of the surface of the austenitic stainless steel can be improved.
Description
Technical field
The invention belongs to the technology, particularly a kind of quick method for preparing the high corrosion-resisting austenite stainless steel top layer of control austenitic stainless steel surface performance.
Context analyzer
Crystal boundary has important impact as one of polycrystalline material important constitutional features to the performance of material.Research finds that many phenomenons (crystal boundary spreads, separates out, corrodes) are closely related with the structure of crystal boundary.The intergranular carbide phenomenon that selectivity is separated out on crystal boundary mainly is because cause different with structure of energy that different crystal boundaries has.Aust and Rutter utilize first laboratory facilities to observe low energy CSL (coincident site lattice) crystal boundary to have unique performance.A large amount of low energy CSL (1≤Σ≤29) crystal boundaries that studies show that have following features: 1) lower energy; 2) impurity atoms and solute segregation had lower susceptibility; 3) low diffusivity; 4) low specific resistance.Just because of having above-mentioned characteristic, low energy CSL crystal boundary (particularly Σ 3) has manifested the strong restraining effect of slippage, fracture, corrosion and stress corrosion cracking, sensitization and solute segregation (equilibrium and non-equilibrium), that have or even fully immune.Low energy CSL crystal boundary is at polycrystalline material ubiquity in polycrystalline material, and its frequency of occurrences and material preparation process are closely related.And free crystal boundary often becomes the passage of core and the crack propagation of crack growth, thereby causes the appearance of intergranular corrosion cracks and intergranular stress corrosion crack owing to have high energy and high movability.Based on the understanding to the crystal boundary performance, the Bian Zhongxiong professor has proposed " Grain boundary design and control " in 1984 concept is crossed by material system of northeastern Japan university.Come performance to material by the control to the design of crystal boundary type and distribution, for example intensity, toughness and corrosion resistance nature are optimized and improve.Canadian material supply section scholar is " crystal boundary engineering " with this deduction of conception subsequently.So-called crystal boundary engineering (Grain Boundary Engineering) is exactly by certain heat engine tool working method, control the crystal boundary distribution characteristics of material, particularly improve the ratio of special grain boundary, and make continuous free crystal boundary dispersion, thereby reach the purpose of control and optimization material property.20 years in the past, the crystal boundary engineering was widely used in the exploitation of material and structure property control.
What can find now nearly all investigator's employing all is the heat engine tool working method of prestress-annealing or prestress-recrystallize, its thermal treatment all is to realize by traditional chamber type electric resistance furnace heating, namely under higher temperature, carry out for a long time anneal, increased greatly energy consumption.Prestress can be realized the control that Grain Boundary Character distributes to block materials integral body in conjunction with the method for tradition annealing, thereby improves the intergranular corrosion drag of material.Yet the corrosion failure of material is normally from material surface, gradually to material internal infiltration and diffusion, therefore obtain one deck by the heat treated means of deformation mating surface and have the anti-corrosion top layer of optimizing grain boundary structure, the corrosion-resistant drag that improves material is had great importance.
High-frequency induction heating is a kind of surface heat processing mode, its ultimate principle is: heating material (being workpiece) is placed in the coil that is connected with alternating current, because the effect inside workpiece of alternating magnetic field can produce induced potential, under the effect of induced potential, can produce eddy current in the workpiece, rely on the energy of these eddy current to reach the heating purpose.Because the eddy current that produces in the workpiece is inhomogeneous in the cross-sectional area of conductor distribution, and very strong on the surface, inside is very weak, heart section is close to zero again.Using this surface action can heat rapidly material surface, and rate of heating can reach 100-1000 ℃/s, and depth of interaction can reach 1-2mm.Compare the high energy consumption of traditional chamber type electric resistance furnace tens hours even twenties hours, high-frequency quenching has the advantages that processing speed is fast, energy consumption is low, can improve significantly processing efficiency, reduces production costs.In fact, high-frequency quenching has been widely used in the surface treatment of ferrous materials, difference is that it mainly is the hardness that improves steel material surface by martensitic transformation that traditional surface high frequency is quenched, thereby its wear resistance is improved, it is cold rolling in conjunction with high-frequency quenching processing controls austenitic stainless steel top layer grain boundary structure feature to there is no employing, and then improves the report of corrosion resistance of austenitic stainless steels.
Summary of the invention
The object of the present invention is to provide the fast preparation method on a kind of high corrosion-resisting austenite stainless steel top layer, thereby under short time and less energy-consumption, realize the raising to austenitic stainless steel intergranular corrosion resistance performance.
The technical solution that realizes the object of the invention is, the fast preparation method on a kind of high corrosion-resisting austenite stainless steel top layer, and concrete steps are as follows:
1. will test used stainless steel materials solution treatment shrend.
2. on two cold mills, stainless steel materials is carried out cold-rolling treatment.
3. the sheet material after cold roller and deformed is placed radio-frequency induction coil, adjust high-frequency induction outward current, frequency and heat-up time, material surface is carried out high-frequency induction heating.
4. sample is carried out Water Quenching.
5. shrend after the sample sensitization after will processing.
The present invention compared with prior art, its remarkable advantage is: the high-frequency induction rapid heating is the shortening heat treatment time greatly, prepare fast the top layer that one deck possesses excellent corrosion resistance, reduce energy consumption, reduce discharging, the lightening material surface oxidation degree, and HF induction heating apparatus is simple, is easy to realize streamlined scale operation.
Below in conjunction with accompanying drawing the present invention is described in further detail.
Description of drawings
Accompanying drawing is austenitic stainless steel Grain Boundary Character distribution plan, and wherein (a) is starting material, (b) for after processing.
Embodiment
The present invention is based on the concept of crystal boundary engineering, introduces strain by cold rolling, controls the grain boundary structure feature of material surface by follow-up high-frequency induction hardening, thereby the corrosion resistance nature of austenitic stainless steel is improved.Concrete steps are as follows:
1. will test the shrend behind solution treatment 30min under 1050 ℃ of temperature of used stainless steel materials.
2. on two cold mills stainless steel materials is carried out cold-rolling treatment, the draught of cold rolling thickness direction is being controlled between the 5%-30%.
3. then the sheet material after cold roller and deformed is placed radio-frequency induction coil, adjust high-frequency induction outward current, frequency and heat-up time, material surface is carried out high-frequency induction heating.
4. sample is carried out shrend.
5. will process sample shrend behind 650 ℃ of lower sensitization 2h later.
Wherein high-frequency induction outward current, frequency and heat-up time see Table 1.
Table 1 high-frequency induction hardening treating processes processing parameter
| Output frequency/KHz | Outward current/A | Heat-up time/s |
| 50 | 400-600 | 15-45 |
In the following Examples and Comparative Examples, represent the effect of optimization of material grain boundary structure feature with special grain boundary length percentage ratio (%), it is better to be worth higher explanation crystal boundary effect of optimization; The corrosion resistance nature that represents respectively material with reactivate current ratio (%) and corrosion potential (V).The reactivate current ratio is lower, and corrosion potential just more is being tending towards, and the erosion resistance of illustrative material is better.
Embodiment 1
It is cold rolling to utilize 180 pairs of roller cold rolling experiment machines of Ф that austenite stainless steel plate is carried out, and the thickness direction draught is 5%.Subsequently, in HF induction heating apparatus sample is carried out high-frequency induction heating, the high-frequency induction heating output frequency is 50KHz, and outward current is respectively 400A, 500A, 600A, and be 15s heat-up time, heats and carries out immediately Water Quenching after complete.The low energy CSL(coincidence site lattice of processing sample inside) ratio of special grain boundary changes with the ratio-frequency heating electric current, and concrete test result sees Table 2.
The sample of processing is inlayed with Resins, epoxy and solidifying agent, be prepared into the galvanic corrosion sample of standard.Under room temperature at 0.5M H
2SO
4In+0.01M KSCN the solution sample is carried out reactivation (EPR) experiment and polarization curve measurement, reactivate current ratio and corrosion potential change with the ratio-frequency heating electric current.Sample is listed in table 2 at reactivate current ratio and corrosion potential that 650 ℃ of sensitization 2h record.
The test result of the different ratio-frequency heating electric currents of table 2
Embodiment 2
It is cold rolling to utilize 180 pairs of roller cold rolling experiment machines of Ф that austenite stainless steel plate is carried out, and the thickness direction draught is 5%.Subsequently, in HF induction heating apparatus sample is carried out high-frequency induction heating, the high-frequency induction heating output frequency is 50KHz, and outward current is 600A, is respectively 25s, 35s, 45s heat-up time, heats and carries out immediately Water Quenching after complete.The low energy CSL(coincidence site lattice of processing sample inside) ratio of special grain boundary changed with the ratio-frequency heating time, and concrete test result sees Table 3.
The sample of processing is inlayed with Resins, epoxy and solidifying agent, be prepared into the galvanic corrosion sample of standard.Under room temperature at 0.5M H
2SO
4In+0.01M KSCN the solution sample is carried out reactivation (EPR) experiment and polarization curve measurement, reactivate current ratio and corrosion potential changed with the ratio-frequency heating time.Sample is listed in table 3 at reactivate current ratio and corrosion potential that 650 ℃ of sensitization 2h record.
The test result of different ratio-frequency heating times of table 3
Embodiment 3
It is cold rolling to utilize 180 pairs of roller cold rolling experiment machines of Ф that austenite stainless steel plate is carried out, and the thickness direction draught is respectively 5%, 10%, 20%, 30%.Subsequently, in HF induction heating apparatus sample is carried out high-frequency induction heating, the high-frequency induction heating output frequency is 50KHz, and outward current is 600A, and be 45s heat-up time, heats and carries out immediately Water Quenching after complete.The low energy CSL(coincidence site lattice of processing sample inside) ratio of special grain boundary changes with cold rolling variable, and concrete test result sees Table 4.
The sample of processing is inlayed with Resins, epoxy and solidifying agent, be prepared into the galvanic corrosion sample of standard.Under room temperature at 0.5M H
2SO
4In+0.01M KSCN the solution sample is carried out reactivation (EPR) experiment and polarization curve measurement, reactivate current ratio and corrosion potential change with cold rolling reduction.Sample is listed in table 4 at reactivate current ratio and corrosion potential that 650 ℃ of sensitization 2h record.
The test result of the different cold rolling reductions of table 4
Comparative Examples 1
For the difference on comparison process material and starting materials tissue and the performance, get one of starting materials at 1050 ℃ of solution treatment 30min, subsequently at 650 ℃ of sensitization 2h, 0.5M H at normal temperatures then
2SO
4Carry out electrochemical corrosion experimental in the+0.01M KSCN solution, test result is positioned at table 2-4.Can find that under identical sensitization condition, the more raw-material corrosion resistance nature of corrosion resistance nature that grain boundary structure is optimized sample is greatly improved.
To make the standard metallographic specimen through the material that the present invention processes, and utilize the Grain Boundary Character of EBSD technical testing material to distribute after polishing, polishing, the electrolytic corrosion, the ratio of special grain boundary can be up to 80% in the tissue; Under identical sensitization condition, the reactivate electric current has descended 63.7% than mother metal, and the corrosion resistance nature of material is greatly improved.Grain Boundary Character distribution situation in the prepared high corrosion-resisting austenite stainless steel material structure of the present invention, wherein the ratio of special grain boundary (Σ≤29) is 80.41%(Fig. 1 (b)), and Grain Boundary Character distribution situation in the starting material tissue, wherein the ratio of special grain boundary (Σ≤29) is 30.08%(Fig. 1 (a)).
Claims (5)
1. the preparation method on a high corrosion-resisting austenite stainless steel top layer is characterized in that concrete steps are as follows:
Step 1, the stainless steel materials solution treatment shrend that experiment is used;
Step 2 is carried out cold-rolling treatment to stainless steel materials on two cold mills;
Step 3 places radio-frequency induction coil with the sheet material after cold roller and deformed, and material surface is carried out high-frequency induction heating;
Step 4 is carried out Water Quenching with sample;
Step 5 is with shrend after the sample sensitization after processing.
2. the preparation method on high corrosion-resisting austenite stainless steel according to claim 1 top layer is characterized in that: in the step 1 with stainless steel materials shrend behind solution treatment 30min under 1050 ℃ of temperature.
3. the preparation method on high corrosion-resisting austenite stainless steel according to claim 1 top layer, it is characterized in that: cold roling reduction is 5%-30% in the step 2.
4. the preparation method on high corrosion-resisting austenite stainless steel according to claim 1 top layer, it is characterized in that: step 3 medium-high frequency induction outward current is 400-600A; The high-frequency induction output frequency is 50KHz; Be 15-45s heat-up time.
5. the preparation method on high corrosion-resisting austenite stainless steel according to claim 1 top layer is characterized in that: will process sample shrend behind 650 ℃ of lower sensitization 2h later in the step 5.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103215415A (en) * | 2013-05-03 | 2013-07-24 | 南京理工大学 | Method for quickly improving corrosion resistance of material surface in situ |
| CN107385166A (en) * | 2017-06-27 | 2017-11-24 | 湖南大学 | A kind of strong plasticity for improving austenitic stainless steel cold-rolled plate and corrosion proof method |
| CN107937689A (en) * | 2017-11-29 | 2018-04-20 | 上海航天精密机械研究所 | Improve the method for the resistance to spot corrosion performance of stainless steel and intensity |
| CN108359780A (en) * | 2018-04-09 | 2018-08-03 | 西南交通大学 | The method for improving metastable state austenite stainless hardness of steel and anti-stress corrosion performance |
| CN109971925A (en) * | 2019-05-17 | 2019-07-05 | 淮海工学院 | Improve the thermomechanical treatment process method of austenitic stainless steel anti intercrystalline corrosion performance |
| CN110564918A (en) * | 2019-09-29 | 2019-12-13 | 无锡市锡西化机配件有限公司 | Solution heat treatment process for stainless steel |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107937689A (en) * | 2017-11-29 | 2018-04-20 | 上海航天精密机械研究所 | Improve the method for the resistance to spot corrosion performance of stainless steel and intensity |
| CN108359780A (en) * | 2018-04-09 | 2018-08-03 | 西南交通大学 | The method for improving metastable state austenite stainless hardness of steel and anti-stress corrosion performance |
| CN109971925A (en) * | 2019-05-17 | 2019-07-05 | 淮海工学院 | Improve the thermomechanical treatment process method of austenitic stainless steel anti intercrystalline corrosion performance |
| CN110564918A (en) * | 2019-09-29 | 2019-12-13 | 无锡市锡西化机配件有限公司 | Solution heat treatment process for stainless steel |
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Inventor after: Yang Sen Inventor after: Gu Zhenyu Inventor after: Xu Xiao Inventor after: Wang Xiaoyan Inventor after: Feng Wen Inventor after: Zhong Yiping Inventor before: Yang Sen Inventor before: Gu Zhenyu Inventor before: Xu Xiao Inventor before: Wang Xiaoyan Inventor before: Feng Wen |
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Effective date of registration: 20160531 Address after: 215000 No. 89, blue and white road, Suzhou hi tech Zone, Jiangsu Patentee after: SUZHOU VICO MATERIAL TECHNOLOGY CO., LTD. Address before: 210094 Xiaolingwei, Jiangsu, No. 200, Patentee before: Nanjing University of Science and Technology |
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