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Forging method of high-temperature alloy fine-grained bars

A high-temperature alloy and fine-grained technology, which is applied in the field of forging, can solve problems such as insufficient carbide crushing, single deformation direction, and bar grain growth, so as to save strategic alloy resources, refine grain size, and grain size. The effect of uniform and fine tissue

Active Publication Date: 2012-06-13
CENT IRON & STEEL RES INST
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Problems solved by technology

[0004] At present, the GH4169 alloy bar produced by the one-way drawing process of the rapid forging machine in China has a single deformation direction, and the carbides are not sufficiently broken and distributed in series along the flow line, which is easy to become the source of fatigue cracks.
In addition, due to the multi-fire forging and returning to the furnace for empty firing, the grain size of the rod grows, and it is difficult to obtain a uniform fine-grained structure.
The above reasons have become the bottleneck restricting the improvement of the quality of high-temperature alloy rods in my country

Method used

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  • Forging method of high-temperature alloy fine-grained bars
  • Forging method of high-temperature alloy fine-grained bars
  • Forging method of high-temperature alloy fine-grained bars

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Embodiment Construction

[0026] In the present invention, GH4169 alloy fine-grained rods are prepared by means of combined forming by upsetting, drawing and diameter forging. figure 1 shown. The Φ508mm GH4169 alloy ingot is vacuum induction melted (VIM)+vacuum consumable remelted (VAR) unidirectionally elongated bar, the surface is polished to Φ480mm, and the bar is drawn to Φ240mm in the fast forging machine; The bar blanked by upsetting and drawing process is Φ508mm GH4169 alloy ingot of VIM+VAR, the surface is polished to Φ480mm, and it is drawn to the original length after one-time upsetting with 30% deformation. After a second upsetting with 30% deformation, it is pulled out to the original length. Then continue unidirectional drawing to Φ240mm bar. figure 2 It is the finite element numerical calculation result of the relationship between multiple upsetting and drawing and deformation, which shows that the nominal value of the three billet opening methods is one-way drawing, one-time upsetting...

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Abstract

The invention belongs to the technical field of forging, and relates to a forging method of high-temperature alloy fine-grained bars. According to the invention, a combined breakdown production method of upsetting and stretching, and radial forging is adopted. A deflection is large, deflection directions are changed alternately, carbide is sufficiently crushed, and carbide is distributed in a dispersed state, such that the fatigue property of the alloy is improved. The bar is finally subject to one-heating molding through radial forging, such that grain growing caused by the direct fired bar which is delivered back to a furance is avoided. Also, the method is beneficial for excircle deflection of the bar. Therefore, fine-grained bars with a grain grade difference smaller than 2 grades areobtained. The method is a novel method with a good prospect. The method is suitable for high-temperature alloy fine-grained bar productions. If the method is popularized, good social and economical benefits can be brought in.

Description

technical field [0001] The invention belongs to the technical field of forging, and in particular relates to a forging method for fine-grained superalloy rods, which is suitable for hot forging of GH4169 alloys in the metallurgical industry, and is used for superalloys with narrow deformation temperature ranges and sensitive thermal processing parameters of billet. technical background [0002] Due to their excellent comprehensive mechanical properties, oxidation resistance and corrosion resistance, superalloys have become indispensable materials for key components in petrochemical, nuclear energy, aviation, aerospace and other industrial fields that withstand harsh environments such as high temperature, corrosion, and load. Superalloys generally have higher content of alloying elements, such as Ni, Cr, Mo, W, Co, etc. Most of these alloy elements are strategic alloy resources in my country, and the raw material prices are relatively high. The addition of such elements bri...

Claims

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Application Information

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IPC IPC(8): C22F1/10C22C19/05
Inventor 吕旭东杜金辉邓群曲敬龙王民庆毕中南陈国胜王庆增
Owner CENT IRON & STEEL RES INST
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