Preparation method of GH4169 alloy bars

A GH4169 alloy technology, applied in metal processing equipment, metal extrusion dies, etc., can solve problems such as instability between batches of production, uneven grain size, etc., and achieve consistent deformation conditions at the head and tail of bars and material utilization. High, simple and convenient process

Active Publication Date: 2020-05-05
TIANJIN HEAVY EQUIP ENG RES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned analysis, the embodiment of the present invention aims to provide a preparation method of GH4169 alloy bar stock to solve the problems of uneven grain size and batch-to-batch instability of GH4169 alloy bar stock in the prior art

Method used

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  • Preparation method of GH4169 alloy bars
  • Preparation method of GH4169 alloy bars

Examples

Experimental program
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Effect test

Embodiment 1

[0029] This embodiment provides a method for preparing a GH4169 alloy fine-grained bar stock, comprising the following steps:

[0030] Step 1. Utilize the free forging press to upset the ingot by means of closed upsetting or open forging upsetting. The upsetting deformation temperature is 1110±20°C, and the upsetting deformation is 30-60%;

[0031] In the above step 1, controlling the initial forging temperature at 1110±20°C can ensure that the as-cast structure of the ingot is fully broken, which is conducive to the formation of a uniform structure inside the bar.

[0032] In the above step 1, the upsetting deformation is controlled at 30-60%. On the one hand, it is necessary to ensure that the as-cast structure of the bar is broken. On the other hand, in order to ensure that the extrusion ratio in step 3 is between 3 and 6 , so as to ensure that recrystallization fully occurs inside the bar during the hot extrusion process.

[0033] By controlling the upsetting and the defo...

Embodiment 2

[0048] This embodiment is used to prepare a fine-grained rod with a diameter of φ300mm.

[0049] Step 1: Use the free forging press to use closed upsetting or free forging upsetting The ingot is upset, and the deformation temperature is 1110±10°C. After the homogenized ingot is heated evenly, it is released from the furnace for upsetting, and the upsetting deformation is 43%.

[0050] In the above step 1, controlling the initial forging temperature at 1110±10°C can ensure that the as-cast structure of the ingot is fully broken, which is conducive to the formation of a uniform structure inside the bar.

[0051] In the above step 1, the amount of upsetting deformation is controlled at 43%. On the one hand, it is necessary to ensure that the as-cast structure of the bar is broken; Ensure that recrystallization fully occurs inside the bar during hot extrusion. Step 2: Perform surface machining on the forged blank obtained by upsetting, remove black skin and defects, and select ...

Embodiment 3

[0059] The present embodiment is used for preparing diameter and is φ 300mm fine-grained bar stock, comprises the following steps:

[0060] Step 1: Use the free forging press to perform upsetting by means of closed upsetting or open forging upsetting. The deformation temperature is 1110°C. After the ingot is heated to a uniform temperature, it is out of the furnace for upsetting. The upsetting deformation is 45%.

[0061] In the above step 1, controlling the initial forging temperature at 1110°C can ensure that the as-cast structure of the ingot is fully broken, which is conducive to the formation of a uniform structure inside the bar.

[0062] In the above step 1, the amount of upsetting deformation is controlled at 45%. On the one hand, it is necessary to ensure that the as-cast structure of the bar is broken. On the other hand, in order to ensure that the extrusion ratio is between 4.5 and Fully recrystallized inside the bar during extrusion.

[0063] Step 2: Perform surfa...

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Abstract

The invention relates to a preparation method of GH4169 alloy bars, and belongs to the technical field of high-temperature alloy hot machining. The problems that the grain sizes of GH4169 alloy bars in the prior art are not uniform, and batch-to-batch production is not stable are solved. The preparation method includes the following steps that 1, a free forging press is used for upsetting cast ingots in a closed upsetting or free forging upsetting manner, wherein the upsetting deformation temperature is 1,110+ / -20 DEG C; 2, forging blanks obtained after upsetting are subjected to surface machining, black skin and defects are removed, and cylindrical forging blanks are obtained; and 3, the machined blanks are heated, the heating temperature is 980 DEG C-1,060 DEG C, the forging blanks continue to be subjected to heat preservation for 60 min-480 min after being fully heated, then the forging blanks are discharged out of a furnace to be subjected to hot extrusion, the time between furnacedischarging and extrusion starting is controlled within 5 min, the surfaces of the forging blanks are coated with a lubricant before the forging blanks are extruded, and a glass cushion is arranged between an extrusion die and the forging blanks. High-stability manufacturing that the structures of the sections, the heads and the tails of the GH4169 alloy bars with the diameters larger than or equal to 250 mm are uniform and fine, and the grain sizes are smaller than the level 4 or even the level 6 is achieved.

Description

technical field [0001] The invention relates to the technical field of metal materials, in particular to a method for preparing a GH4169 alloy rod. Background technique [0002] The GH4169 alloy is a nickel-based superalloy that is precipitated and strengthened by the γ″ phase with a body-centered cubic structure and the γ′ phase with a face-centered cubic structure. It has excellent oxidation resistance, high strength, and good With excellent ductility and toughness, good welding performance and good machining performance, it has a very wide range of applications in aero-engines, gas turbines, deep-sea oil wells and other fields. [0003] The GH4169 alloy bar for aviation and aerospace has very high requirements on the uniformity of structure, grain size, grain level difference, and stability between batches. However, large-scale fine-grained bars are generally produced by rapid forging. It is more difficult, and edge black crystals, mixed crystals, necklace crystals, etc....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/04B21J5/00B21J5/08B21C23/08B21C23/32B21C25/02B21C29/00
CPCB21C37/04B21J5/002B21J5/08B21C23/08B21C23/32B21C25/02B21C29/003
Inventor 白亚冠张鑫聂义宏曹志远寇金凤郭伟李红梅王宝忠
Owner TIANJIN HEAVY EQUIP ENG RES
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