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Hot Processing Method for Improving Microstructure Uniformity of gh720li Alloy Cake Forgings

A technology of uniform structure and hot working, applied in the field of nickel-based superalloys, can solve the problems of unevenness, unstable performance, coarse grains of turbine disc blank forgings, etc., to improve the uniformity of structure and achieve the effect of accuracy

Active Publication Date: 2021-02-09
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above deficiencies, the present invention proposes a thermal processing method for improving the uniformity of the structure of the GH720Li alloy cake blank forging. Uniformity of Microstructure of GH720Li Alloy Cake Blank Forging

Method used

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  • Hot Processing Method for Improving Microstructure Uniformity of gh720li Alloy Cake Forgings
  • Hot Processing Method for Improving Microstructure Uniformity of gh720li Alloy Cake Forgings

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Experimental program
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Effect test

Embodiment 1

[0029]The chemical composition and weight percentage of the GH720Li alloy are: C 0.01%~0.02%, Cr 15.5%~16.5%, Co 14%~15.5%, Ti 4.75%~5.25%, Al 2.25%~2.75%, Mo 2.75% %~3.25%, W 1%~1.5%, Zr 0.025%~0.05% and the balance nickel. The alloy ingot is made by vacuum induction + vacuum consumable double vacuum melting, and then homogenized and forged to open the billet to obtain ASTM 7.0 alloy bar.

[0030]The steps of the hot working method for improving the uniformity of the structure of the GH720Li alloy cake blank forging by adopting the present invention are:

[0031]Step 1: Cut and chamfer the GH720Li alloy bar;

[0032]Step 2: Use a heating furnace to pre-treat the alloy bar stock, heat the alloy billet to 1050°C, hold it for 2.5 hours, and then slowly cool it to 700°C at a cooling rate of 20°C / h, then cool it to room temperature and release it;

[0033]Step 3: After the pretreated alloy bar billet is surface-blasted and the glass lubricant is evenly applied, the alloy bar billet is heated to 109...

Embodiment 2

[0039]The chemical composition and weight percentage of the GH720Li alloy are: C 0.01%~0.02%, Cr 15.5%~16.5%, Co 14%~15.5%, Ti 4.75%~5.25%, Al 2.25%~2.75%, Mo 2.75% %~3.25%, W 1%~1.5%, Zr 0.025%~0.05% and the balance nickel. The alloy ingot is made by vacuum induction + vacuum consumable double vacuum melting, and then homogenized and forged to open the billet to obtain ASTM 8.0 alloy bar.

[0040]The steps of the hot working method for improving the uniformity of the structure of the GH720Li alloy cake blank forging by adopting the present invention are:

[0041]Step 1: Cut and chamfer the GH720Li alloy bar;

[0042]Step 2: Use a heating furnace to pre-treat the alloy bar billet, heat the alloy billet to 1020°C, keep it for 3 hours, then slowly cool it to 700°C at a cooling rate of 30°C / h, then cool it to room temperature and release it;

[0043]Step 3: After the pre-processed alloy bar billet is sand-blasted on the surface and the glass lubricant is evenly applied, the alloy bar billet is hea...

Embodiment 3

[0049]The chemical composition and weight percentage of the GH720Li alloy are: C 0.01%~0.02%, Cr 15.5%~16.5%, Co 14%~15.5%, Ti 4.75%~5.25%, Al 2.25%~2.75%, Mo 2.75% %~3.25%, W 1%~1.5%, Zr 0.025%~0.05% and the balance nickel. The alloy ingot is made by vacuum induction + vacuum consumable double vacuum smelting, and then homogenized and forged to open the billet to obtain ASTM 9.0 grade alloy bar.

[0050]The steps of the hot working method for improving the uniformity of the structure of the GH720Li alloy cake blank forging by adopting the present invention are:

[0051]Step 1: Cut and chamfer the GH720Li alloy bar;

[0052]Step 2: Use a heating furnace to pre-treat the alloy bar stock, heat the alloy billet to 1000°C, keep it for 3h, then slowly cool it to 700°C at a cooling rate of 40°C / h, then cool it to room temperature and discharge it;

[0053]Step 3: After the pretreated alloy bar billet is surface-blasted, and the glass lubricant is evenly coated, the alloy bar billet is heated to 1060°...

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Abstract

The invention relates to a hot processing method for improving structure uniformity of a GH720 Li alloy cake blank forging. The method comprises the steps of carrying out pretreatment of slowly cooling at a cooling speed of 10-50 DEG C per hour after carrying out heat preservation for 1-3.5 h on a GH720 Li alloy bar blank at 1000-1120 DEG C, then correspondingly carrying out isothermal forging processes under different hot processing parameters on alloy bar blanks with initial grain sizes of ASTM grade 6.5-8.0 and above ASTM grade 8.0, and finally carrying out slow cooling treatment on the cake blank forging. The method solves the problem of unstable performance of the GH720 Li forgings due to uneven structures with coarse local grains, and effectively improves the uniformity of GH720 Li alloy cake blank forging.

Description

Technical field[0001]The invention is a hot working method for improving the uniformity of the structure of a GH720Li alloy cake blank forging, and belongs to the field of nickel-based high-temperature alloys.Background technique[0002]GH720Li alloy is a high-strength, corrosion-resistant and age-strengthened high-temperature alloy. It is mainly used as a high-performance turbine disk material for long-term use at 650℃~750℃ or short-term use at 900℃[Yu Qiuying, Dong Jianxin, Zhang Maicang, Zheng Lei . Thermodynamic calculation of the equilibrium precipitation phase of the difficult-to-deform superalloy GH720Li. Rare Metal Materials and Engineering, 2010, 39(5): 857-861; Vaunois JR, Cormier J, Villechanise P, et al. Influence of bothγ'distribution and grain size on the tensile properties of Udimet 720Li at roomtemperature.In:Ott EA,Groh JR,Banik A,eds.7th International Symposium onSuperalloy 718 and Derivatives,Superalloy 718,625,706and various derivatives,TMS,Warrendale,PA,2010,199-2...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21J1/06B21J5/00
CPCB21J1/06B21J5/002
Inventor 于秋颖兰博方爽李凯林莺莺
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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