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Forging method of powder high-temperature alloy rod

A technology for high-temperature alloys and bars, which is applied in metal processing equipment and other directions, and can solve the problems of large size of parent alloy ingots, difficult wire cutting operations, and coarse and concentrated inclusions.

Inactive Publication Date: 2019-04-16
FUSHUN SPECIAL STEEL SHARES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Domestic powder superalloys are generally made of electrodes poured after smelting in a vacuum induction furnace as the master alloy, and the powder is directly prepared. The master alloy does not undergo remelting and smelting, and there is no thermal processing operation. The production process is relatively easy, the gas content is high, and the inclusions are relatively coarse. Concentrated, the internal structure of the alloy is not uniform and dense
It is smelted by the triple process, the gas content is lower after multiple smelting, and the inclusions are finer and more dispersed. However, the size of the master alloy steel ingot smelted by the triple process is relatively large, and it is not easy to prepare for wire cutting before powder making; powder high temperature Alloys generally have a very high alloy ratio. A large amount of tungsten and molybdenum elements are added to the alloy for solid solution strengthening. At the same time, a large amount of aluminum, titanium, and niobium elements are added for aging strengthening. The degree of alloying is extremely high. Extremely poor, narrow thermal deformation temperature range, prone to cracks during thermal deformation

Method used

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  • Forging method of powder high-temperature alloy rod
  • Forging method of powder high-temperature alloy rod
  • Forging method of powder high-temperature alloy rod

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Finished bar specifications: Φ150mm

[0034] The single-fire deformation of forging is controlled at about 10%, and the final forging temperature is controlled at about 980°C. After the deformation, the bar is polished and inspected to observe the inclusions of the alloy.

[0035] The flaw detection reaches level 2.0, there is no crack in the flaw detection, and the grain size is level 5.0 (see figure 1 ), inclusions (see figure 2 ), the levels are shown in Table 2.

[0036] Table 2 Inclusion Levels

[0037] Inclusions

Embodiment 2

[0039] Finished bar specifications: Φ150mm

[0040] The single-fire deformation of the forging is controlled at about 22%, and the final forging temperature is controlled at 990°C. After the deformation, the bar is polished and inspected to observe the inclusions of the alloy.

[0041] The flaw detection reaches level 2.2, there is no crack in the flaw detection, and the grain size is level 4.0 (see image 3 ), inclusions (see Figure 4 ), the levels are shown in Table 3.

[0042] Table 3 Inclusion Levels

[0043] Inclusions

Embodiment 3

[0045] Finished bar specifications: Φ150mm

[0046] The single-fire deformation of the forging is controlled at about 22%, and the final forging temperature is controlled at 990°C. After the deformation, the bar is polished and inspected to observe the inclusions of the alloy.

[0047] The flaw detection reaches level 2.5, there is no crack in the flaw detection, and the grain size is 3.0 (see Figure 5 ) level, inclusions (see Figure 6 ), the levels are shown in Table 4.

[0048] Table 4 Inclusion Levels

[0049] Inclusions

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Abstract

The invention discloses a forging method of a powder high-temperature alloy rod. The forging method aims to forge a steel ingot smelted through a triple process into the small-specification rod through high-temperature diffusion, an alloy structure is crushed well, and inner inclusions are obviously improved compared with that of a cast ingot. The forging method adopts the following technical scheme: smelting is carried out through the triple process of a vacuum induction furnace, a protective atmosphere electric slag furnace and a consumable electrode vacuum furnace, a diffusion heating curveis made according to alloy component characteristics, and uniformity of components in the alloy steel ingot is improved through high-temperature diffusion; and then forging production is carried out,a forging process of an alloy adopts means of controlling the heating temperature and the deformation and appropriate soft cladding, the quality of the forged rod is ensured, and no crack exists in the surface of the forged rod. The forging method has the advantages that the alloy steel ingot is subjected to high-temperature diffusion treatment to be forged, the forging process adopts the means of controlling the heating temperature and the deformation and appropriate soft cladding, the quality of the forged rod is ensured, the master alloy structure is crushed well, crystal grains are refined, the inner inclusions are obviously improved compared with that of a cast ingot, and no crack exists in the surface of the forged rod.

Description

technical field [0001] The invention belongs to a metal material forging process, in particular to a method for forging a powder superalloy rod. Background technique [0002] Before the powder superalloy is prepared, it is necessary to smelt the master alloy steel ingot, and then prepare the powder alloy steel ingot through a series of processes, and prepare the master alloy required for the powder. It is required that the internal inclusions of the alloy are sufficiently uniform and fine, and the gas content is low. Domestic powder superalloys are generally made of electrodes poured after smelting in a vacuum induction furnace as the master alloy, and the powder is directly prepared. The master alloy does not undergo remelting and smelting, and there is no thermal processing operation. The production process is relatively easy, the gas content is high, and the inclusions are relatively coarse. Concentration, the internal structure of the alloy is not uniform and dense enoug...

Claims

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Application Information

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IPC IPC(8): B21J5/00
CPCB21J5/002
Inventor 王艾竹王志刚张鹏李宁王树财侯智鹏李飞扬李成龙韩魁刘猛于杰王洋洋
Owner FUSHUN SPECIAL STEEL SHARES