CN101914662B - Thermal treatment method for obtaining nanometer strengthening phase by HR3C austenitic heat-resistance steel - Google Patents
Thermal treatment method for obtaining nanometer strengthening phase by HR3C austenitic heat-resistance steel Download PDFInfo
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- CN101914662B CN101914662B CN2010102741467A CN201010274146A CN101914662B CN 101914662 B CN101914662 B CN 101914662B CN 2010102741467 A CN2010102741467 A CN 2010102741467A CN 201010274146 A CN201010274146 A CN 201010274146A CN 101914662 B CN101914662 B CN 101914662B
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Abstract
The invention discloses a thermal treatment method for obtaining a nanometer strengthening phase by HR3C austenitic heat-resistance steel. The thermal treatment method comprises two steps as follows: firstly, solution treatment: heating a steel member to 1170-1250 DEG C for 30-60min, and then cooling water to the room temperature; and secondly, annealing treatment: heating the steel member after solution treatment to 800-950 DEG C for 30-240min, and then cooling air to the room temperature. In the HR3C austenitic heat-resistance steel treated by using the thermal treatment method, high-density NbCrN-type nanometer strengthening phases with the size ranging from 20 nm to 60 nm are evenly distributed in the austenite grain, wherein 5-30 strengthening phase grains are distributed in per square micro. The invention obviously improves the high-temperature duration intensity and ensures good high temperature corrosion resistance.
Description
Technical field
The heat treating method, especially the ultra supercritical fired power generating unit that the present invention relates to a kind of HR3C austenitic heat-resistance steel acquisition nano-strengthening phase belong to the heat treatment technics field with the heat treating method of austenitic heat-resistance steel.
Background technology
Improve generating efficiency, reduce CO
2And other discharge of harmful gases, to economize on resources be the developing direction of fired power generating unit from now on.Improve steam parameter, development large vol unit is the main means that improve thermo-efficiency.Countries in the world fired power generating unit parameter develops into supercritical parameter by subcritical parameter at present, even ultra supercritical (ultra-super critical, USC) parameter.The gordian technique of development USC unit is that the exploitation hot strength is high, high temperature resistance flue gas oxidation corrosion and high temperature carbonated drink dielectric corrosion, weldability and manufacturability are good, the material of relative low price.
HR3C is the trade mark of SUMITOMO CHEMICAL metal name, and the material mark in the ASME standard is SA312-TP310NbN (UNS S31042).The HR3C steel is widely used in overcritical and suphtr and reheater ultra-supercritical boiler; Be on the basis of TP310 austenitic heat-resistance steel; Through the restriction carbon content; And compound interpolation massfraction is that 0.20%～0.60% strong carbonitride forming element niobium and massfraction are 0.15%～0.35% nitrogen, utilize that diffusion-precipitation distributes, tiny NbCrN mutually and carbonitride and the M of rich Nb
23C
6(M is the metallic element of Cr and replaceable Cr, like Fe) type carbide is strengthened.At present, the technological process of production of HR3C high temperature steel product is: and bar-blank processing-hot extrusion-cold rolling-solution treatment-finished product [research of Jiang Huaihai .TP310HNbN seamless steel tube for boiler ME, advanced power station is with high temperature steel and alloy symposial; Shanghai: 2009], its final thermal treatment process is solution treatment, microstructure be on austenitic matrix, be distributed with NbCrN mutually and MX (M is meant strong carbonitride forming element V, Nb etc.; X is meant C and/or N) type carbonitride phase; The size of these strengthening phases is bigger, and is about about 1 μ m, little also more than 100nm; And quantity seldom, and the strengthening phase number deficiency is 0.1 in every square micron area.As everyone knows, the effect of dispersion-strengthened is relevant with size with disperse phase particulate quantity, and the disperse phase particle is more little, and quantity is many more, and its strengthening effect is good more.Chinese patent 200710113974.0 discloses the method that a kind of Ascalloy obtains the high-density nano-strengthening phase; At first obtain to contain the lath martensite of dislocation substructure through normalizing treatment; And then through high tempering processing acquisition high-density and equally distributed MX type nano-strengthening phase in martensite lath, highdensity dislocation substructure is that separating out of nano-strengthening phase provides the nucleation site.But concerning austenitic heat-resistance steel, owing in process of cooling, do not undergo phase transition and form the high density dislocation substructure, thereby be difficult for obtaining the high-density nano-strengthening phase.At present, also there is not bibliographical information in austenitic heat-resistance steel, to obtain the method for high-density and equally distributed nano-strengthening phase.
Summary of the invention
The purpose of this invention is to provide the heat treating method that a kind of HR3C austenitic heat-resistance steel obtains nano-strengthening phase, its technical scheme is:
A kind of HR3C austenitic heat-resistance steel obtains the heat treating method of nano-strengthening phase, it is characterized in that thermal treatment is in two steps: the first step, and solution treatment is heated to 1170-1250 ℃ with steel part, keeps 30-60min, is cooled to room temperature then; Second step, anneal, the steel part that will pass through after the solution treatment is heated to 800-950 ℃, keeps 30-240min, and air cooling is to room temperature then.
Its principle of work is:
The microstructure of HR3C austenitic heat-resistance steel under the forming process state is by austenitic matrix and the thick complicated nitride phase composite of NbCrN facies pattern; The purpose of solution treatment is exactly with these thick phases being dissolved in the matrix as much as possible, in annealing process, separates out more nano-strengthening phase for next step and prepares.With the rising and the holding time prolonging of solid solution temperature, thick NbCrN phased soln just many more, the nano reinforcement phase density of separating out after the annealing is just high more.But temperature is too high or the time is oversize, can cause austenite crystal too thick, is unfavorable for the performance of HR3C austenitic heat-resistance steel.The solid solution temperature that the present invention confirms is between 1170-1250 ℃, and the time, preferred solid solution treatment process parameter was between 30-60min: 1200-1220 ℃ keeps 45-50min, be cooled to room temperature then.
Anneal after the solution treatment is in the inner key that obtains equally distributed high-density NbCrN type nano-strengthening phase of the austenite crystal of steel.Temperature is lower than 800 ℃, not only NbCrN type nano-strengthening phase separate out time lengthening, simultaneously because crystal boundary M
23C
6Separating out of type carbide causes the poor Cr of crystal boundary district serious, reduced the anti-grain boundary corrosion ability of high temperature of HR3C steel.Along with the rising of annealing temperature, the time of separating out of NbCrN type nano-strengthening phase shortens, simultaneously because the velocity of diffusion of Cr increases crystal boundary M
23C
6Separating out of type carbide can not cause the poor Cr of crystal boundary district yet.But temperature is higher than 950 ℃, and NbCrN type nano-strengthening phase forming core density reduces, and particle size increases, and separates out density and reduces, and reduces dispersion-strengthened effect.The annealing treating process that the present invention recommends is: 800-950 ℃, keep 30-240min, and air cooling is to room temperature then.The annealing treating process parameter of optimizing is: 850-880 ℃, keep 50-80min, and air cooling is to room temperature then.
The present invention compared with prior art; Its advantage is: at the equally distributed highdensity NbCrN type nano-strengthening phase of the inner acquisition of austenite crystal; Its thermostability is high; High-Temperature Strengthening is effective, obviously improves through the creep rupture strength of the HR3C of technical finesse of the present invention austenitic heat-resistance steel, and the resistance to high temperature corrosion performance might as well.
Description of drawings
Fig. 1 is the nano-strengthening phase pattern that the HR3C austenitic heat-resistance steel obtains after thermal treatment of the present invention (embodiment 3);
Fig. 2 is HR3C austenitic heat-resistance steel microstructure of (prior art) under the solution treatment state.
Embodiment
Test is seen table 1 with the chemical ingredients of HR3C austenitic heat-resistance steel.Make the HR3C steel part through melting, hot-work and cold working, heat-treat by heat treating method of the present invention then, heat treatment process parameter is seen table 2.A HR3C steel part part after heat treatment is processed into metallographic specimen is observed strengthening phase under FEI Sirion sem pattern; Measure the granule number of the nano-strengthening phase that comprises in every square micron area; A part is processed into the lasting sample of standard and on CSS-3905 electronics creep and stress rupture test machine, carries out rupture test; According to the rupture test result, adopt the Larson-Miller parameter method to estimate 700 ℃, the 100000 hours creep rupture strengths under the condition.Creep rupture strength test result under the granule number of the nano-strengthening phase that comprises in every square micron area and 700 ℃, the 100000 hours conditions is listed in table 2.From table 2, can find out; The HR3C austenitic heat-resistance steel of handling through heat treating method of the present invention has obtained high-density and equally distributed nano-strengthening phase in austenite crystal inside; Compared with prior art, the creep rupture strength under 700 ℃, 100,000 hours conditions obviously improves.Fig. 1 is the nano-strengthening phase pattern that the HR3C austenitic heat-resistance steel obtains after heat treating method of the present invention (embodiment 3 in the table 2) thermal treatment; Fig. 2 is HR3C austenitic heat-resistance steel strengthening phase pattern without anneal (comparative example 7 in the table 2, prior art) after solution treatment.Also can find out from Fig. 1, Fig. 2: the HR3C austenitic heat-resistance steel that adopts the present invention to handle has high-density and equally distributed CrNbN type nano-strengthening phase, the CrNbN type nano-strengthening phase that the HR3C austenitic heat-resistance steel that prior art is handled does not have high-density to distribute.
Table 1 test is with the chemical ingredients of HR3C austenitic heat-resistance steel
Table 2 heat treatment process parameter
Claims (1)
1. a HR3C austenitic heat-resistance steel obtains the heat treating method of nano-strengthening phase, it is characterized in that thermal treatment is in two steps: the first step, and solution treatment is heated to 1170-1250 ℃ with steel part, keeps 30-60min, is cooled to room temperature then; Second step, anneal, the steel part that will pass through after the solution treatment is heated to 800-950 ℃, keeps 30-240min, and air cooling is to room temperature then.
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| CN2010102741467A CN101914662B (en) | 2010-09-07 | 2010-09-07 | Thermal treatment method for obtaining nanometer strengthening phase by HR3C austenitic heat-resistance steel |
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| CN101914662B true CN101914662B (en) | 2012-02-01 |
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| CN107475640B (en) * | 2017-08-08 | 2018-05-22 | 永兴特种不锈钢股份有限公司 | A kind of preparation method of the austenitic heat-resistance steel of the anti-steam corrosion of high-lasting strength |
| CN107586931B (en) * | 2017-09-14 | 2019-02-01 | 西安热工研究院有限公司 | A kind of heat treatment process improving the effective austenitic heat-resistance steel Aging impact toughness of boiler |
| CN109706293A (en) * | 2019-01-07 | 2019-05-03 | 太原理工大学 | It is a kind of that the corrosion proof method of heat resisting steel is improved by working hardening |
| CN114875346B (en) * | 2021-12-10 | 2023-05-30 | 中国科学院金属研究所 | Heat treatment method for inhibiting precipitation of coarse grain boundary carbide of austenitic alloy |
| CN115044754B (en) * | 2022-04-26 | 2023-12-15 | 安徽工业大学 | Method for improving intergranular corrosion resistance of C-HRA-5 austenitic heat-resistant steel |
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| US4455352A (en) * | 1982-11-08 | 1984-06-19 | The Babcock & Wilcox Company | Materials system for high strength corrosion resistant bimetallic products |
| JPS59110767A (en) * | 1982-12-14 | 1984-06-26 | Sumitomo Metal Ind Ltd | Austenite stainless steel |
| DE3407307A1 (en) * | 1984-02-24 | 1985-08-29 | Mannesmann AG, 4000 Düsseldorf | USE OF A CORROSION-RESISTANT AUSTENITIC IRON-CHROME-NICKEL-NITROGEN ALLOY FOR MECHANICALLY HIGH-QUALITY COMPONENTS |
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