CN101525733B - Heat treatment technology for improving intercrystalline corrosion resistant performance of austenitic nickel-based corrosion resistant alloy - Google Patents
Heat treatment technology for improving intercrystalline corrosion resistant performance of austenitic nickel-based corrosion resistant alloy Download PDFInfo
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- CN101525733B CN101525733B CN 200910077092 CN200910077092A CN101525733B CN 101525733 B CN101525733 B CN 101525733B CN 200910077092 CN200910077092 CN 200910077092 CN 200910077092 A CN200910077092 A CN 200910077092A CN 101525733 B CN101525733 B CN 101525733B
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Abstract
The invention belongs to the technical field of metal material heat treatment technology and in particular relates to a heat treatment technology for improving the intercrystalline corrosion resistant performance of an austenitic nickel-based corrosion resistant alloy. The main chemical components of corrosion resistant 690 alloy according to weight percentage are as follows: 0.01-0.03 percent of C, 28.00-31.00 percent of Cr, 8.00-11.00 percent of Fe, 58.00-63.00 percent of Ni, less than or equal to 0.05 percent of N, less than or equal to 0.50 percent of Ti, less than or equal to 0.50 percent of Al and less than or equal to 0.01 percent of S. The technology comprises the concrete steps as follows: firstly 690 alloy material is heated up to 1,050 DEG C to 1,100 DEG C to keep the temperature for 10-30 minutes and is cooled to room temperature fast; the material is heated up to 850 DEG C to 900 DEG C and treated by stabilization treatment for 2 hours and then is cooled to the room temperature fast; the material is heated up to 715 DEG C to keep the temperature for 2 to 5 hours and is cooled to the room temperature fast. The fasting cooling manner is air cooling or water cooling. Compared with the prior art, the invention has the advantages of simple operation, shortened total heat-treatable time and being capable of improving the intercrystalline corrosion resistant performance of 690 alloy obviously.
Description
Technical field
The invention belongs to metallic substance thermal treatment process technology field, particularly a kind of thermal treatment process that improves austenitic nickel-based anti-corrosion 690 alloy intergranular corrosion resistance performances.
Background technology
690 alloys are a kind of austenitic nickel-based non-corrosive metals, and are main at present as pressurized water reactor nuclear power station steam generator heat transfer tubing.The intergranular corrosion of 690 alloys is one of topmost corrosion forms of vapour generator, and its intergranular corrosion resistance performance directly influences the security and the reliability of Nuclear power plants.
Because the solid solubility of elemental carbon is very little in the nickel-base alloy, make that carbon back originally is dissolved into matrix in the tissue even if alloy is carried out abundant solution treatment, but along with the reduction of temperature, the solid solubility of carbon descends, oversaturated carbon electrode is easily with Cr
23C
6Form separate out, and then cause and occur poor chromium district near the crystal boundary, significantly reduce the intergranular corrosion resistance performance of alloy.In order to address this problem, the traditional thermal treatment process of present 690 alloys is that 1050 ℃-1100 ℃ solution treatment adds 700 ℃-750 ℃ desensitizations and handles 10-15h, and purpose is to handle by overaging, makes Cr in the alloy structure
23C
6Fully separate out and have the sufficiently long time to finish the diffusion of chromium, improve alloy intergranular corrosion resistance performance thereby fill and lead up poor chromium district.But apparent, Cr is as a kind of element that improves the alloy corrosion resistance energy, with Cr on the one hand
23C
6Form fully separate out and the Cr that causes to consume be a kind of waste; On the other hand, the treatment time of desensitizing has for a long time also been reduced the production efficiency of factory, has increased production cost.
Corrosion is used " reactivate rate R in learning usually
a" represent the severity of alloy intergranular corrosion.And " electrochemistry potentiokinetic reactivation (EPR) method " is a kind of quick, harmless, quantitative electrochemistry inspection testing method, can measure reactivate rate R
aValue is come the criterion of quantitative evaluation material intergranular corrosion and is widely used.R
aBe worth lowly more, it is low more to characterize alloy intergranular corrosion tendency, and the intergranular corrosion resistance performance is excellent more.
Summary of the invention
The object of the present invention is to provide a kind of simple to operate, can shorten total heat treatment time, and can significantly improve the thermal treatment process of austenitic nickel-based anti-corrosion 690 alloy intergranular corrosion resistance performances.
According to above-mentioned purpose, technical solution of the present invention and principle of work are:
Utilize the existing alloying constituent of 690 alloys, only can improve the utilization ratio of Cr element by rational heat treatment technology, improving corrosion resistance of alloy promptly is the starting point that the present invention considers.
In 690 alloy structures, because the avidity of element ti and C is greater than Cr, the type that carbide is separated out is except Cr
23C
6Outward, Ti also can be preferentially as stabilizing element and C form TiC type carbide.TiC type carbide belongs to the high temperature precipitated phase, and Cr
23C
6The type carbide belongs to the low temperature precipitated phase; TiC is distributed in crystal grain inside with the small and dispersed shape, and Cr
23C
6Mainly concentrating on crystal boundary separates out.At Cr
23C
6A large amount of dissolvings of type carbide and keep the sufficiently long time in the temperature range that TiC type carbide is separated out, promptly stabilization treatment makes C fully combine with Ti, gives full play to the effect of Ti element in 690 alloys, helps the carbide type by Cr
23C
6Type transforms to the TiC type, can reduce Cr
23C
6The amount of separating out, thereby improve 690 alloy intergranular corrosion resistance performances.
According to above-mentioned purpose and principle of work, the concrete technical scheme of the present invention is:
The chemical component weight % of austenitic nickel-based anti-corrosion 690 alloy materials is: C:0.01-0.03, Cr:28.00-31.00, Fe:8.00-11.00, Ni:58.00-63.00, N≤0.05, Ti≤0.50, Al≤0.50, S≤0.01.
This technology comprises following concrete steps:
A. 690 alloy materials are heated to 1050 ℃-1100 ℃ and be incubated 10min-30min, are as cold as room temperature soon;
B. again above-mentioned materials is heated to 850 ℃-900 ℃ and stabilization treatment 2h, is as cold as room temperature soon;
C. be heated to 715 ℃ of insulation 2h-5h again, be as cold as room temperature soon.
Above-mentioned fast cold mode is air cooling or water-cooled.
That the present invention compared with prior art has is simple to operate, can shorten total heat treatment time, and can significantly improve the advantage of austenitic nickel-based anti-corrosion 690 alloy intergranular corrosion resistance performances.Above-mentioned advantage is specific as follows: do not need to change alloying constituent, promptly can significantly improve the intergranular corrosion resistance performance of 690 alloys.Heat treatment process is based on factory's existing weaponry and equipment, and simple easy handling is realized.Can shorten total heat treatment time, save production cost, have tangible economic benefit.
Description of drawings
Fig. 1 is the intergranular corrosion tendency figure of 690 alloys after employing the present invention and the prior heat treatment process.
Sample A is traditional technology thermal treatment in the above-mentioned accompanying drawing, Sample A (1080 ℃ of insulations are incubated 2h, 5h, 10h, 15h respectively for 30min+715 ℃); Sample B, sample C, sample D handle for process heat of the present invention, sample B (1080 ℃ of insulations are incubated 2h, 5h respectively for 30min+850 ℃ stabilization treatment 2h+715 ℃), sample C (1080 ℃ of insulations are incubated 2h, 5h respectively for 30min+875 ℃ stabilization treatment 2h+715 ℃), sample D (1080 ℃ of insulations are incubated 2h, 5h respectively for 30min+900 ℃ stabilization treatment 2h+715 ℃).
Fig. 2 (a) is the i.e. intergranular corrosion shape appearance figure of 690 alloys behind 30min+715 ℃ of insulation of 1080 ℃ of insulations 5h of traditional technology.
Fig. 2 (b) is the intergranular corrosion shape appearance figure of the present invention's 690 alloys behind 30min+875 ℃ stabilization treatment 2h+715 ℃ insulation of 1080 ℃ of insulations 2h.
Embodiment
With 690 alloys (chemical ingredients mass percent: 0.019C, 0.0083N, 0.12Ti, 29.62Cr, 9.88Fe, 59.78Ni, 0.002S, 0.18Al) sheet material 1080 ℃ the insulation 30min, air cooling is divided into four groups with sample to room temperature.With first group of sample (A) 715 ℃ be incubated 2h, 5h, 10h, 15h respectively after water-cooled to room temperature.At 850 ℃ of stabilization treatment 2h, water-cooled is to room temperature with second group of sample (B); And then 715 ℃ be incubated 2h, 5h respectively after water-cooled to room temperature.At 875 ℃ of stabilization treatment 2h, water-cooled is to room temperature with the 3rd group of sample (C); And then 715 ℃ the insulation 2h, 5h after water-cooled to room temperature.At 900 ℃ of stabilization treatment 2h, water-cooled is to room temperature with the 4th group of sample (D); And then 715 ℃ the insulation 2h, 5h after water-cooled to room temperature.All samples are carried out EPR test, testing liquid composition: 0.5MH
2SO
4+ 0.001M KSCN removes oxygen condition, 50 ℃ of test temperatures.Sample after soaking 5min under the corrosion potential, is polarised to+0.200V SCE with the scanning speed forward of 100mV/min, after keeping 2min to treat the sample passivation under this current potential, to the region of activation, finally obtains the reactivate rate R of sample with same speed reverse scanning
aValue.Said sample (A) is handled for traditional technology, and sample (B), (C), (D) are art breading of the present invention.
As can be seen from Figure 1: 690 alloys are carried out traditional technology handle (A), behind 715 ℃ of insulation 2h, R
a=27.75%; Behind the insulation 5h, R
a=21.45%; Behind the insulation 10h, R
a=13.79%; After soaking time extends to 15h, R
aStill reach 5.85%.
And when carrying out this art breading: behind 850 ℃ of stabilization 2h during again at 715 ℃ of insulation 2h, R
aBe reduced to 0.02%; Behind the insulation 5h, R
aBe about 0.02% (B).Behind 875 ℃ of stabilization 2h again 715 ℃ of insulations during 2h, R
aApproximate 0%; Behind the insulation 5h, R
aApproximate 0% (C).Behind 900 ℃ of stabilization 2h again 715 ℃ of insulations during 2h, R
aBe reduced to 0.39%, behind the insulation 5h, R
aApproximate 0% (D).Than traditional technology, 690 alloy intergranular corrosion tendency obviously reduces.
From Fig. 2, also can see, after the EPR test, netted poor chromium district occur in alloy sample (A) tissue that adopts traditional technology to handle, intergranular corrosion serious (Fig. 2 (a)).And intergranular corrosion does not take place in the alloy sample (C) that adopts this art breading, and material intergranular corrosion resistance performance significantly improves (Fig. 2 (b)).
Claims (2)
1. thermal treatment process that improves intercrystalline corrosion resistant performance of austenitic nickel-based corrosion resistant alloy, the chemical component weight % of this is anti-corrosion 690 alloys is: C:0.01-0.03, Cr:28.00-31.00, Fe:8.00-11.00, Ni:58.00-63.00, N≤0.05, Ti≤0.50, Al≤0.50, S≤0.01 is characterized in that this technology comprises following concrete steps:
A. 690 alloy materials are heated to 1050 ℃-1100 ℃ and be incubated 10min-30min, are as cold as room temperature soon;
B. again above-mentioned materials is heated to 850 ℃-900 ℃ and stabilization treatment 2h, is as cold as room temperature soon;
C. be heated to 715 ℃ and be incubated 2h-5h again, be as cold as room temperature soon.
2. the thermal treatment process of raising intercrystalline corrosion resistant performance of austenitic nickel-based corrosion resistant alloy according to claim 1 is characterized in that above-mentioned fast cold mode is air cooling or water-cooled.
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|---|---|---|---|
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| CN112410698B (en) * | 2020-11-03 | 2021-11-02 | 中国航发北京航空材料研究院 | Three-phase Ti2AlNb alloy multilayer structure uniformity control method |
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