CN103484649A - GH4700 alloy ingot homogenizing treatment method - Google Patents
GH4700 alloy ingot homogenizing treatment method Download PDFInfo
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- CN103484649A CN103484649A CN201310425385.1A CN201310425385A CN103484649A CN 103484649 A CN103484649 A CN 103484649A CN 201310425385 A CN201310425385 A CN 201310425385A CN 103484649 A CN103484649 A CN 103484649A
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Abstract
A GH4700 alloy ingot homogenizing treatment method is characterized in that cast-condition alloy is placed into a resistance heated furnace with the temperature lower than 400 DEG C, the temperature is raised to 1130-1150 DEG C at the speed of 100 DEG C/hour, the temperature of 1130-1150 DEG C is kept for 8-10 hours, then the temperature is raised to 1180-1210 DEG C in half an hour, the temperature of 1180-1210 DEG C is kept for 24-32 hours, then the temperature is lowered to 1000 DEG C in a furnace, and the cast-condition alloy is moved out of the furnace to be cooled to room temperature in air. According to the method, Nb and Ti elements of the alloy are made to undergo segregation, the alloy is made to undergo Laves phase elimination, and hot-working plasticity of the alloy is improved.
Description
Technical field
The invention belongs to field of metallurgy, relate to a kind of nickel-base alloy manufacturing process, especially a kind of GH4700 alloy cast ingot homogenising treatment method.
Background technology
The GH4700 alloy is a kind of precipitation strength type nickel base superalloy, and this alloy has excellent mechanical property, structure stability and corrosion and heat resistant ability.Contain the precipitation strength elements such as Al, Ti, Nb due to this alloy, its alloying level is high, in the process of setting of ingot casting, exist solute between solid phase and liquid phase and distribute phenomenon, finally cause solidifying rear dendrite and do and interdendritic uneven components, produce serious dendritic segregation, ingot casting must form Laves and equate harmful phase in cooled tissue, make the hot processing temperature narrow range, Plasticity Decreasing, hot workability variation.The domestic elimination for the element segregations such as Nb, Ti in other nickel-base alloys is studied, and has obtained certain achievement, and for example, for the GH742 alloy of Φ 280mm ingot shape, the homogenization process of eliminating Nb, Ti segregation is 1160 * 8 hours; For Φ 120mm ingot shape IN706 alloy, the homogenization process of eliminating Nb, Ti segregation is 1200 * 24 hours.But, for the GH4700 alloy, its homogenization process has no report.
The alloying level of GH4700 alloy is higher, and the radius difference of different solute atomss causes diffusibility widely different, wherein the large size such as Ti, Nb atom due to diffusibility a little less than, be present in all the time among liquid phase, cause local enrichment of element.When solidifying end, there is obvious composition difference in the dry zone of the dendrite first formed with the zone, interdendritic finally formed, and produces microsegregation.Have the alloy cast ingot of obvious microsegregation, working plasticity is poor, can't directly carry out cogging, must eliminate the harmful phase formed in process of setting through long-time homogenizing annealing, and alloying element is uniformly distributed.
Due to the segregation of Nb element, there is eutectic Laves phase in the GH4700 As-cast Microstructure.Laves phase primary structure is Nb
2ni, be a kind of TCP phase, and easily in interdendritic, the position of rich Nb forms, and is block more.Lave meets and obviously falls low-alloyed hot-workability.Therefore, homogenizing is processed and must be made Laves abundant back dissolving mutually, to guarantee follow-up hot workability.
For the GH4700 alloy, the temperature that homogenizing is processed must enough make Ni, Ti Elements Diffusion, thereby eliminates element segregation.But Lave is the low melting point phase mutually, if select one section equalizing temperature to process, if, more than homogenization temperature is chosen in Lave phase initial melting temperature, can make Laves melt mutually, subsurface defect appears; If homogenization temperature is chosen in below Laves phase initial melting temperature, can't make Nb, Ti element fully spread.
Summary of the invention
In order effectively to eliminate the segregation of the elements such as Nb, Ti in alloy cast ingot, eliminate the harmful phase Laves phase of low melting point, to improve the hot workability of ingot casting, the invention provides a kind of GH4700 alloy cast ingot homogenising treatment method.
Technical scheme of the present invention is: the mass percent chemical composition of GH4700 nickel-base alloy is: C 0.05, and Cr 25.00, and Co 20.00, and Nb 1.65, and Al 1.47, and Ti 1.69, the Ni surplus.
Homogenization process provided by the invention is two step annealings: the first stage annealing temperature is 1130 ~ 1150 ℃, and annealing time is 8 ~ 10 hours, make Laves mutually fully back dissolving in matrix; The secondary stage annealing temperature is 1180 ~ 1210 ℃, and annealing time is 24 ~ 32 hours, makes Nb, Ti Elements Diffusion to evenly, eliminates element segregation.Wherein charging temperature is less than 400 ℃, and heat-up rate is 100 ℃/hs, the air cooling of coming out of the stove after after annealing finishes, first stove is chilled to 1000 ℃.
The present invention can effectively eliminate the segregation of Nb in the GH4700 alloy, Ti element, make simultaneously Laves mutually fully back dissolving advance matrix, improve as much as possible the hot-workability of alloy.
Before homogenizing, there is chequered with black and white dendrite morphology clearly in alloy structure, is distributed with the Laves precipitated phase of Bai Liang in interdendritic, and primary dendritic spacing is about 240 μ m, and secondary dendrite arm spacing is 87.5 μ m.After adopting homogenization process of the present invention to process, dendritic structure is eliminated fully, and Laves phase back dissolving is advanced matrix, and the global tissue of ingot casting is more even.
Embodiment
Below in conjunction with embodiment, the invention will be further described:
The chemical composition of GH4700 nickel-base alloy (wt%) is: C 0.05, and Cr 25.00, and Co 20.00, and Nb 1.65, and Al 1.47, and Ti 1.69, the Ni surplus.
Embodiment 1: resistance furnace is warming up to 300 ℃, as cast condition GH4700 alloy is put into to resistance furnace, with the speed of 100 ℃/hs, be warming up to 1130 ℃, be incubated 10 hours, with being warming up to 1180 ℃ half an hour, be incubated 32 hours afterwards, after cooling to 1000 ℃ with the furnace, the air cooling of coming out of the stove is to room temperature.
Embodiment 2: resistance furnace is warming up to 400 ℃, as cast condition GH4700 alloy is put into to resistance furnace, with the speed of 100 ℃/hs, be warming up to 1150 ℃, be incubated 8 hours, with being warming up to 1210 ℃ half an hour, be incubated 24 hours afterwards, after cooling to 1000 ℃ with the furnace, the air cooling of coming out of the stove is to room temperature.
Embodiment 3: resistance furnace is warming up to 400 ℃, as cast condition GH4700 alloy is put into to resistance furnace, with the speed of 100 ℃/hs, be warming up to 1140 ℃, be incubated 9 hours, with being warming up to 1200 ℃ half an hour, be incubated 28 hours afterwards, after cooling to 1000 ℃ with the furnace, the air cooling of coming out of the stove is to room temperature.
GH4700 ingot casting after above embodiment homogenizing is processed has carried out scanning electron microscopic observation and energy spectrum analysis.Electron microscopic observation shows, the Laves in ingot casting all dissolves mutually, and dendrite morphology is eliminated.Characterize the degree of element segregation with segregation coefficient K, analytical results is as shown in table 1.
Segregation data sheet before and after the various embodiments of the present invention homogenizing:
。
Claims (2)
1. a GH4700 alloy cast ingot homogenising treatment method, the chemical composition of GH4700 nickel-base alloy is: C 0.05, and Cr 25.00, and Co 20.00, and Nb 1.65, and Al 1.47, and Ti 1.69, the Ni surplus; It is characterized in that: cast alloy is put into to the process furnace that temperature is less than 400 ℃, with the speed of 100 ℃/hs, be warming up to 1130 ~ 1150 ℃, be incubated 8 ~ 10 hours, afterwards with being warming up to 1180 ~ 1210 ℃ half an hour, be incubated 24 ~ 32 hours, after cooling to 1000 ℃ with the furnace, the air cooling of coming out of the stove is to room temperature; Nb, the Ti element segregation of alloy are eliminated mutually with Laves.
2. it is characterized in that in accordance with the method for claim 1: described process furnace is resistance furnace.
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Cited By (7)
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| JP2019504185A (en) * | 2015-12-07 | 2019-02-14 | エイティーアイ・プロパティーズ・エルエルシー | Nickel-based alloy processing method |
| CN111270105A (en) * | 2020-04-10 | 2020-06-12 | 北京钢研高纳科技股份有限公司 | Method for homogenizing GH4780 alloy cast ingot, GH4780 alloy casting and application thereof |
| CN111719039A (en) * | 2019-03-22 | 2020-09-29 | 上海电气电站设备有限公司 | FeCoNiAlNb high-temperature alloy homogenization treatment method |
| CN113319468A (en) * | 2021-06-16 | 2021-08-31 | 哈尔滨焊接研究院有限公司 | Component design method of nuclear power nickel-based alloy welding wire capable of preventing welding cracks and nuclear power nickel-based alloy welding wire |
| CN113699413A (en) * | 2021-08-27 | 2021-11-26 | 华能国际电力股份有限公司 | Homogenization heat treatment method for low-cost nickel-iron-based high-temperature alloy cast ingot |
| CN114038522A (en) * | 2021-11-18 | 2022-02-11 | 成都先进金属材料产业技术研究院股份有限公司 | Method for determining homogenizing heat treatment process of GH5188 alloy |
| CN114045436A (en) * | 2021-11-12 | 2022-02-15 | 成都先进金属材料产业技术研究院股份有限公司 | GH2909 alloy ingot and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019504185A (en) * | 2015-12-07 | 2019-02-14 | エイティーアイ・プロパティーズ・エルエルシー | Nickel-based alloy processing method |
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| CN111719039A (en) * | 2019-03-22 | 2020-09-29 | 上海电气电站设备有限公司 | FeCoNiAlNb high-temperature alloy homogenization treatment method |
| CN111270105A (en) * | 2020-04-10 | 2020-06-12 | 北京钢研高纳科技股份有限公司 | Method for homogenizing GH4780 alloy cast ingot, GH4780 alloy casting and application thereof |
| CN113319468A (en) * | 2021-06-16 | 2021-08-31 | 哈尔滨焊接研究院有限公司 | Component design method of nuclear power nickel-based alloy welding wire capable of preventing welding cracks and nuclear power nickel-based alloy welding wire |
| CN113699413A (en) * | 2021-08-27 | 2021-11-26 | 华能国际电力股份有限公司 | Homogenization heat treatment method for low-cost nickel-iron-based high-temperature alloy cast ingot |
| CN114045436A (en) * | 2021-11-12 | 2022-02-15 | 成都先进金属材料产业技术研究院股份有限公司 | GH2909 alloy ingot and preparation method thereof |
| CN114038522A (en) * | 2021-11-18 | 2022-02-11 | 成都先进金属材料产业技术研究院股份有限公司 | Method for determining homogenizing heat treatment process of GH5188 alloy |
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