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Forging method of large-sized die forging part of fine-grain AF1410 steel

A die forging and fine-grain technology, which is used in the field of forging large-scale die forgings of AF1410 ultra-high strength steel with fine-grained structure, can solve the problems of insufficient impact forming characteristics and forming ability, large projected area of ​​large forgings, and many times of die forging. problems, to achieve the effect of improving comprehensive performance, improving the quality of forgings, and improving productivity

Inactive Publication Date: 2017-09-19
中国第二重型机械集团德阳万航模锻有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large deformation resistance of AF1410 alloy, in order to reduce the deformation resistance and ensure the forming of die forgings, the heating temperature of AF1410 steel die forgings formed on the hammer is relatively high, generally around 1120 ° C ~ 1150 ° C, but the projection area of ​​large forgings is large, and the impact of forging hammer equipment Insufficient forming characteristics and forming ability lead to many times of die forging, and the deformation amount of a single fire is small. During the process of multiple high-temperature heating and small deformation, the grain structure is often coarsened, and the grain size is about 4 to 7 grades, or even Mixed crystals appear, the grain structure is coarse and uniform, which has a great influence on the strength, plasticity and fatigue life of forgings

Method used

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  • Forging method of large-sized die forging part of fine-grain AF1410 steel
  • Forging method of large-sized die forging part of fine-grain AF1410 steel
  • Forging method of large-sized die forging part of fine-grain AF1410 steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Forging cross forgings, the structure of the cross forgings is as follows figure 2 shown.

[0043] (1) Raw material: AF1410 alloy bar stock with a diameter of φ250mm, see Table 1 for the chemical composition.

[0044] element

[0045] Table 1 Chemical composition of AF1410 alloy bars

[0046] (2) Heating equipment and heating system: large-scale industrial resistance furnace, the precision of resistance furnace is ±10°C. See the specific heating system figure 1 , The heating temperature control is based on the display of the resistance furnace instrument. The maximum heating temperature of the billet is 1110°C, and the holding time is 300min. The maximum heating temperature of forging is 1090°C, and the holding time is 130min.

[0047] (3) Billet making: the billet making equipment is a 5-ton forging hammer and a 50MN hydraulic press, and the billet is made for 4 fires. The cumulative deformation of each area of ​​the billet during the billet making proces...

Embodiment 2

[0054] It is also a cross forging, and the structure of the forging is the same as that of Embodiment 1.

[0055] (1) Raw materials: adopt the same raw materials as in the examples.

[0056] (2) Heating equipment and heating system: large-scale industrial resistance furnace, the precision of resistance furnace is ±10°C. See the specific heating system figure 1 , The heating temperature control is based on the display of the resistance furnace instrument. The maximum heating temperature of the billet is 1110°C, and the holding time is 350min. The maximum heating temperature of the forging is 1090°C, and the holding time is 170min.

[0057] (3) Billet making: the billet making equipment is a 5-ton forging hammer and a 50MN hydraulic press, and the billet is made for 4 fires. The cumulative deformation of each area of ​​the billet during the billet making process is ≥50%, the forging stop temperature is ≥850°C, and the forging is pit-cooled.

[0058] (4) Die forging: Die forgin...

Embodiment 3

[0064] Forging long arm forgings, forging structure such as Figure 5 shown.

[0065] (1) Raw material: AF1410 alloy bar stock with a diameter of φ250mm, the chemical composition is shown in Table 4.

[0066] element

[0067] Table 4 Chemical composition of AF1410 alloy bars

[0068] (2) Heating equipment and heating system: large-scale industrial resistance furnace, the precision of resistance furnace is ±10°C. See the specific heating system figure 1 , The heating temperature control is based on the display of the resistance furnace instrument. The maximum heating temperature of the billet is 1110°C, and the holding time is 280min. The maximum heating temperature of the forging is 1090°C, and the holding time is 120min.

[0069] (3) Billet making: The billet making equipment is a 5-ton forging hammer, and the billet is made for 2 fires. The cumulative deformation of each area of ​​the billet during the billet making process is ≥ 45%, the forging stop temperature...

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Abstract

The invention relates to the technical field of forging, and discloses a method for forging fine-grained AF1410 steel large die forgings. The heating temperature of the forging method is 1060°C-1110°C, the maximum heating time is ≤1.4 times of the effective thickness of the billet, the deformation speed of the press is 5-15mm / s, and the deformation amount is ≥30%. The method adopts new forging process parameters, reasonably reduces the heating temperature, reduces the heating time, increases the deformation amount of the die forging fire, can refine the grain size of the forging, and increases the grain size grade of the forging to 10-11. The comprehensive properties such as tensile strength, plasticity, impact toughness and fatigue life have been significantly improved. While improving the quality of forgings, it can effectively reduce production costs and increase productivity.

Description

technical field [0001] The invention relates to the technical field of forging, in particular to a method for forging a large die forging of AF1410 ultra-high strength steel with a fine grain structure on a large die forging press. Background technique [0002] AF1410 is a low-carbon, high-alloy, high-toughness, secondary-hardening ultra-high-strength steel with good fatigue resistance, fracture toughness and corrosion resistance. It is often used in key load-bearing structures of aircraft. The grain size of AF1410 alloy forgings has a great influence on the fatigue life. [0003] At present, the domestic production of large die forgings of AF1410 ultra-high strength steel mainly relies on large steam hammers or counter hammers. Due to the large deformation resistance of AF1410 alloy, in order to reduce the deformation resistance and ensure the forming of die forgings, the heating temperature of AF1410 steel die forgings formed on the hammer is relatively high, generally ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/02B21J1/06B21J1/02
CPCB21J5/02B21J1/02B21J1/06
Inventor 张睿张鹏刘松良余胜峰程立维
Owner 中国第二重型机械集团德阳万航模锻有限责任公司
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