CN110964995A - Increase sigma 3 IN IN718 nickel-base superalloynMethod for proportion of type crystal boundary - Google Patents
Increase sigma 3 IN IN718 nickel-base superalloynMethod for proportion of type crystal boundary Download PDFInfo
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Abstract
The invention relates to the field of nickel-based high-temperature alloys, IN particular to a method for improving sigma 3 IN IN718 nickel-based high-temperature alloyn(n is more than or equal to 1 and less than or equal to 3) type crystal boundary proportion. The sigma 3 is improved by adopting a method of combining small-deformation cold working with high-temperature annealingnThe proportion of the type grain boundary is specifically as follows: solution treatment → cold rolling deformation → high temperature annealing, without repeated rolling, simple process and cost saving. IN718 alloy, Sigma 3, processed according to the inventionnThe proportion of the type crystal boundary is 65-85%, wherein the proportion of sigma 3 crystal boundary is not less than 60%. The IN718 alloy treated by the method introduces a large amount of sigma 3 on the premise of not changing the chemical composition of the alloynThe lattice grain boundary at the overlapped position breaks the network connectivity of the original random grain boundary, so that the originally mutually connected random grain boundaries are sigma 3nThe interruption of the type crystal boundary and the special triple points is expected to remarkably improve the corrosion resistance and the hydrogen embrittlement resistance of the IN718 alloy.
Description
Technical Field
The invention relates to the field of nickel-based high-temperature alloys, IN particular to a method for improving sigma 3 IN IN718 nickel-based high-temperature alloyn(n is more than or equal to 1 and less than or equal to 3) type crystal boundary proportion.
Background
IN718 (national brand GH4169) is a precipitation strengthening type nickel-based wrought superalloy, has excellent high-temperature strength and high-temperature corrosion resistance, and is a key material used IN the fields of aviation, aerospace, nuclear industry and the like IN a large quantity. Meanwhile, as a promising structural material, the IN718 alloy is also rapidly popularized and applied IN oil and gas exploitation, storage and transportation. It should be pointed out that the alloy has higher hydrogen brittleness sensitivity in a hydrogen environment, is easy to generate hydrogen induced crystal-following cracking and the like, and has higher hydrogen induced failure risk.
The properties of polycrystalline materials are closely related to the type of grain boundaries and their characteristic distribution. It was found that an increase of sigma 3nThe proportion of the type grain boundary forms a grain boundary network structure with more coincident position lattice interfaces, breaks the connectivity of a random grain boundary network, and can obviously improve the performance of the material related to the grain boundary. Such as: the grain boundary structure and the network distribution are regulated and controlled in the 304 stainless steel material to ensure that sigma 3nThe grain boundary is increased to 75%, the propagation of intergranular cracks is inhibited, and the creep resistance and intergranular corrosion resistance of the material can be obviously improved. When hydrogen is segregated on large-angle random grain boundaries IN the IN718 nickel-base superalloy, the grain boundary bonding strength is significantly reduced, resulting IN the occurrence of hydrogen induced grain-boundary cracking. Therefore, by regulating and controlling the grain boundary characteristics and distribution of the IN718 alloy, the corrosion resistance and the hydrogen-induced peritectic cracking resistance of the alloy are expected to be remarkably improved, and the alloy has wide application prospect.
Disclosure of Invention
The invention aims to provide a method for improving sigma 3 IN IN718 nickel-base superalloyn(n is more than or equal to 1 and less than or equal to 3) type grain boundary proportion method, adopts simple small deformation cold working combined high temperature annealing method, obviously improves sigma 3 IN IN718 nickel-based high temperature alloyn(n is more than or equal to 1 and less than or equal to 3) type crystal boundary.
The technical scheme of the invention is as follows:
increase sigma 3 IN IN718 nickel-base superalloynThe method for proportioning the type grain boundary adopts a method combining small deformation cold working and high temperature annealing, and comprises the following steps:
(1) carrying out solution treatment on the IN718 nickel-based high-temperature alloy plate, wherein the treatment method is to keep the temperature at 1000-1030 ℃ for 0.5-1 h;
(2) performing water quenching treatment on the nickel-based high-temperature alloy plate subjected to heat preservation treatment in the step (1);
(3) performing cold rolling deformation on the nickel-based high-temperature alloy plate subjected to water quenching treatment in the step (2), wherein the deformation amount is 4-10%;
(4) and (4) preserving the heat of the nickel-based high-temperature alloy plate subjected to the cold rolling deformation treatment in the step (3) for 0.5-1 h at 980-1030 ℃, and then taking out and air-cooling to room temperature.
Sigma 3 IN the enhanced IN718 nickel-base superalloynThe method for the proportion of the type crystal boundary comprises the step of enabling the thickness of the nickel-based high-temperature alloy plate to be 2-4 mm.
Sigma 3 IN the enhanced IN718 nickel-base superalloynThe method of the proportion of the type grain boundary adopts the method of the small deformation cold working combined with the high temperature annealing to lead sigma 3 in the alloynThe proportion of the type crystal boundary is 65-85%, wherein the proportion of sigma 3 crystal boundary is not less than 60%.
Sigma 3 IN the enhanced IN718 nickel-base superalloynMethod for forming grain boundary ratio by introducing high ratio sigma 3 into alloynAfter the grain boundary is formed, the connectivity of the original random grain boundary network is broken, so that the original mutually connected random grain boundaries are sigma 3nThe grain boundary and the special triple junction are interrupted.
The design idea of the invention is as follows:
the method improves sigma 3 IN the IN718 nickel-based high-temperature alloy by combining small-deformation cold working with high-temperature annealingn(n is more than or equal to 1 and less than or equal to 3) type crystal boundary, the sigma 3 crystal boundary proportion in the alloy is increased to more than 60 percent, sigma 3nThe proportion of the type crystal boundary is increased to 65-85%; meanwhile, a plurality of grain boundary networks with coincident position lattice interfaces are formed, and the connectivity of random grain boundaries is broken, specifically: solution treatment → cold rolling deformation → high temperature annealing. Wherein, the solid solution treatment: keeping the temperature at 1000-1030 ℃ for 0.5-1 h to ensure that the strengthening phase, the carbide and the like are dissolved in the matrix as much as possible to obtain a uniform solid solution strengthening matrix; pre-deformation: 4-10% of cold rolling deformation generates larger strain energy in the crystal, and provides a driving force for the migration of a crystal boundary in the subsequent heat treatment process; high-temperature annealing: keeping the temperature at 980-1030 ℃ for 0.5-1 h, and enabling grain boundaries to migrate to form high proportion sigma 3nThe grain boundary breaks the connectivity of a random grain boundary network.
The invention has the advantages and beneficial effects that:
1. the invention can obviously improve the quality of the alloy by combining simple small-deformation cold working with high-temperature annealing on the premise of not changing the chemical components of the alloySigma 3 in the alloyn(n is more than or equal to 1 and less than or equal to 3), repeated rolling is not needed, the process is simple, and the cost is saved.
2. IN718 Ni-based superalloy treated by the method of the present invention, sigma 3 IN the alloyn(n is more than or equal to 1 and less than or equal to 3) the proportion of the type grain boundary is 65-85%, and the proportion of sigma 3 grain boundary is not less than 60%.
3. The IN718 nickel-base high-temperature alloy treated by the method of the invention is prepared by introducing high proportion sigma 3n(n is more than or equal to 1 and less than or equal to 3) type coincident position lattice grain boundaries can break the connectivity of the original random grain boundaries, so that the original mutually connected random grain boundary network is sigma 3nThe interruption of the type crystal boundary and the special triple junction is expected to remarkably improve the corrosion resistance and the hydrogen embrittlement resistance of the IN718 alloy.
Drawings
FIG. 1 shows the grain boundary characteristic distribution of the IN718 alloy after solution treatment and high temperature annealing; wherein (a) solution treatment (Sigma 3)nThe proportion of type grain boundary is 35.3 percent and (b) high-temperature annealing treatment (sigma 3)nThe proportion of type grain boundaries was 71.4%).
Detailed Description
IN the specific implementation process, the invention provides a method for improving sigma 3 IN IN718 nickel-base superalloyn(n is more than or equal to 1 and less than or equal to 3) type crystal boundary proportion. The small deformation cold working combined with high temperature annealing method is adopted to promote the sigma 3 grain boundary proportion to be increased to more than 60 percent (length proportion), sigma 3nThe proportion of the type crystal boundary is increased to 65-85%; using a high ratio sigma 3nThe model crystal boundary breaks the connectivity of the large-angle random crystal boundary to form more crystal boundary networks with coincident position lattice interfaces, and the process flow is as follows: solution treatment → cold rolling deformation → high temperature annealing. Wherein: the thickness range of the IN718 nickel-based high-temperature alloy plate is 2-4 mm, and the mass percentages of chemical components are as follows: ni: 51.20, Cr: 18.86, Mo: 3.03, Al: 0.55, Nb: 4.99, Ti: 1.03, Si: 0.06, B: 0.005, C: 0.03, Mg: 0.003, Co: 0.01, P: 0.004, S: 0.001, Cu: 0.02, Fe: and (4) the balance.
The present invention will be described in further detail below by way of examples and figures.
Example 1:
this example improves Sigma 3 IN IN718 Ni-based superalloynThe specific implementation process of the method for the proportion of the type grain boundary is as follows:
1. putting the IN718 alloy hot rolled plate into a heat treatment furnace, preserving heat for 0.5-1 h (1 h IN the embodiment) at 1000-1030 ℃ (1020 ℃) and taking out for water quenching treatment;
2. and (3) performing cold rolling deformation of 4-10% (5% IN the embodiment) on the IN718 alloy sheet subjected to the solution treatment IN the step (1) by using a four-roll cold rolling mill.
3. And (3) carrying out high-temperature annealing treatment on the IN718 alloy plate subjected to cold rolling deformation IN the step (2), wherein the temperature is kept at 980-1020 ℃ (1020 ℃ IN the embodiment) for 0.5-1 h (1 h IN the embodiment), and then air cooling is carried out to room temperature.
4. And (3) cutting a sample from the alloy plate treated in the step (3) and carrying out Electron Back Scattering Diffraction (EBSD) analysis. TABLE 1 shows the differences ∑ 3nProportion of type grain boundaries. Sigma 3 in the alloy after small-deformation cold working and high-temperature annealingnThe proportion of the type grain boundary is increased to 65 to 80% (71.4% in the present example), and the proportion of the sigma 3 grain boundary is increased to 60% or more (60.5% in the present example).
5. And (4) cutting a sample from the alloy plate treated in the step (3) and performing EBSD analysis. As shown in fig. 1, where gray represents sigma 3nType grain boundaries, black representing high angle random grain boundaries. As can be seen from the grain boundary characteristic distribution, sigma 3 is present in the alloy after the low-strain cold working in combination with the high-temperature annealing treatment, as compared with the solution treatment (FIG. 1(a))nThe proportion of the type grain boundary is obviously improved, more grain boundary networks with overlapped position lattice interfaces are formed, and the connectivity of the large-angle random grain boundary is broken (figure 1 (b)).
TABLE 1 different types ∑ 3nRatio of grain boundaries
IN this example, the thickness of the IN718 Ni-based superalloy sheet was 3.0mm, and a large amount of sigma 3 appeared IN the alloy after the sheet was subjected to small deformation cold working and high temperature annealing (5% deformation +1020 ℃ heat preservation for 1 hour)nThe proportion of the type grain boundary is as high as 71.4 percent, wherein the proportion of sigma 3 grain boundary is 60.5 percent, the connectivity of random grain boundaries is broken, and the originally interconnected random grain boundary network is enabled to be sigma 3n(n is more than or equal to 1 and less than or equal to 3) type crystal boundary and special three-node interruption.
Example 2:
an IN718 alloy hot rolled plate having the same chemical composition as IN example 1 and a plate thickness of 3.0mm was subjected to small deformation cold working and high temperature annealing treatment, specifically: keeping the temperature at 1020 ℃ for 1h, and then performing water quenching treatment; after cold rolling deformation of 5%, high-temperature heat preservation treatment at 1000 ℃ for 1h is carried out, and then the steel plate is taken out and air-cooled to room temperature. The EBSD is adopted to carry out grain boundary structure analysis, and the result shows that the sigma 3 grain boundary proportion in the alloy is 66.6 percent and sigma 3nThe proportion of the grain boundary is 81.4 percent, the connectivity of the large-angle random grain boundary is interrupted, and the grain boundaries with different types sigma 3nThe grain boundary ratio is shown in Table 2.
TABLE 2 different types ∑ 3nRatio of grain boundaries
IN this example, the thickness of the IN718 Ni-based superalloy hot-rolled sheet was 3.0mm, and a large amount of sigma 3 was observed IN the alloy after the alloy was subjected to a combination of small-deformation cold working and high-temperature annealing (5% deformation +1000 ℃ C. for 1 hour)nThe proportion of the type grain boundary is as high as 81.4 percent, the proportion of sigma 3 grain boundary is as high as 66.6 percent, the connectivity of large-angle random grain boundaries is broken, and the sigma 3 grain boundary network originally connected with each other is enabled to be formed byn(n is more than or equal to 1 and less than or equal to 3) type crystal boundary and special three-node interruption.
Example 3:
a hot-rolled IN718 alloy sheet having the same chemical composition as IN example 1 and a thickness of 3.0mm was subjected to cold working with small deformation and high-temperature annealing. The method specifically comprises the following steps: keeping the temperature at 1020 ℃ for 1h, and then performing water quenching treatment; performing 10% cold rolling deformation and heat preservation treatment at 980 ℃ for 1h, and then taking out and air-cooling to room temperature. The EBSD is adopted to carry out grain boundary structure analysis, and the result shows that the proportion of sigma 3 grain boundary in the alloy is 65.6 percent and sigma 3 grain boundarynThe proportion of the grain boundary is as high as 74.3 percent, the connectivity of the random grain boundary with large angle is broken, and the grain boundary with different types sigma 3nThe grain boundary ratio is shown in Table 3.
TABLE 3 different types ∑ 3nRatio of grain boundaries
IN this example, the thickness of the IN718 hot rolled Ni-based superalloy is 3.0mm, and a large amount of sigma 3 is generated IN the alloy after the alloy is subjected to small-deformation cold working and high-temperature annealing (10% deformation +980 ℃ for 1 hour)nThe proportion of the type grain boundary is 74.3 percent, the proportion of sigma 3 grain boundary reaches 65.6 percent, the connectivity of large-angle random grain boundaries is broken, and the sigma 3 network of the originally interconnected random grain boundary is formed byn(n is more than or equal to 1 and less than or equal to 3) type crystal boundary and special three-node interruption.
The results of the examples show that the technical scheme of the invention can achieve the aim of the invention within the process parameter range, and effectively improve sigma 3n(n is more than or equal to 1 and less than or equal to 3) type grain boundary proportion, breaks the connectivity of large-angle random grain boundaries, and ensures that the originally interconnected random grain boundary network is sigma 3n(n is more than or equal to 1 and less than or equal to 3) type crystal boundary and special three-node interruption.
Claims (4)
1. Increase sigma 3 IN IN718 nickel-base superalloynThe method for proportioning the type grain boundaries is characterized in that a method combining small-deformation cold working and high-temperature annealing is adopted, and the method comprises the following steps:
(1) carrying out solution treatment on the IN718 nickel-based high-temperature alloy plate, wherein the treatment method is to keep the temperature at 1000-1030 ℃ for 0.5-1 h;
(2) performing water quenching treatment on the nickel-based high-temperature alloy plate subjected to heat preservation treatment in the step (1);
(3) performing cold rolling deformation on the nickel-based high-temperature alloy plate subjected to water quenching treatment in the step (2), wherein the deformation amount is 4-10%;
(4) and (4) preserving the heat of the nickel-based high-temperature alloy plate subjected to the cold rolling deformation treatment in the step (3) for 0.5-1 h at 980-1030 ℃, and then taking out and air-cooling to room temperature.
2. Increasing sigma 3 IN IN718 nickel-base superalloys according to claim 1nCrystal formThe method is characterized in that the thickness range of the nickel-based high-temperature alloy plate is 2-4 mm.
3. Increasing sigma 3 IN IN718 nickel-base superalloys according to claim 1nThe method for controlling the proportion of the type grain boundary is characterized in that the sigma 3 in the alloy is realized by adopting a method of low-deformation cold working combined with high-temperature annealingnThe proportion of the type crystal boundary is 65-85%, wherein the proportion of sigma 3 crystal boundary is not less than 60%.
4. Increasing sigma 3 IN IN718 nickel-base superalloys according to claim 1nMethod for forming grain boundary ratios, characterized in that a high ratio sigma 3 is introduced into the alloynAfter the grain boundary is formed, the connectivity of the original random grain boundary network is broken, so that the original mutually connected random grain boundaries are sigma 3nThe grain boundary and the special triple junction are interrupted.
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| CN115679230A (en) * | 2022-10-25 | 2023-02-03 | 重庆理工大学 | Surface treatment process for improving hydrogen embrittlement resistance of nickel-based corrosion-resistant alloy |
| CN115852276A (en) * | 2022-12-23 | 2023-03-28 | 中国科学院金属研究所 | Grain boundary regulation and control process for inhibiting precipitation of harmful grain boundary precipitated phase in face-centered cubic high-entropy alloy |
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