Fine-grain forging method for large-size GH690 nickel-based alloy bar billet

A GH690, nickel-based alloy technology, applied in the field of forging, can solve problems such as hindering the application of alloys, coarse grain structure, and poor control of fire deformation, so as to improve the yield and stability of the structure, and the grains are uniform and fine Effect

Active Publication Date: 2014-04-02
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing forging process is generally to directly forge the steel ingot without homogenization treatment, without repeated upsetting and drawing process, and the heating temperature in the forging process is too high, and the deformation of the fire is not strictly controlled, so that the produced T

Method used

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  • Fine-grain forging method for large-size GH690 nickel-based alloy bar billet
  • Fine-grain forging method for large-size GH690 nickel-based alloy bar billet
  • Fine-grain forging method for large-size GH690 nickel-based alloy bar billet

Examples

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Example Embodiment

[0026] Example 1:

[0027] A method for fine-grain forging of large-size GH690 nickel-based alloy bar stock is as follows:

[0028] Step 1: Homogenization treatment. The GH690 nickel-based alloy steel ingot was heated to 1180°C in a heat treatment furnace and kept for 36 hours.

[0029] Step 2: Upsetting. The homogenized GH690 nickel-based alloy steel ingot is heated to 1180°C in a heating furnace, and then the steel ingot is upset on a forging press to a height of 1 / 2 times the height of the original steel ingot to obtain a primary cake. The said primary cake blank is drawn on a forging press and changed back to the height of the original steel ingot to obtain a secondary bar.

[0030] Step 3: Heat the secondary bar described in step 2 to 1180°C in a heating furnace, and then upset the secondary bar on a forging press to a height of 1 / 2 times the height of the ingot to obtain a secondary cake Billet. The said secondary cake blank is drawn on a forging press and changed back to th...

Example Embodiment

[0036] Example 2

[0037] A method for fine-grain forging of large-size GH690 nickel-based alloy bar stock is as follows:

[0038] Step 1: Heat the GH690 nickel-based alloy steel ingot in a heat treatment furnace to 1180°C and keep it for 36 hours.

[0039] Step 2: Heat the homogenized GH690 nickel-based alloy steel ingot in a heating furnace to 1160°C, and then upset the steel ingot on a forging press to a height of 2 / 5 times the height of the original steel ingot to obtain a primary cake. Then, the primary cake blank is drawn on a forging press and changed back to 9 / 10 times the height of the original steel ingot to obtain a secondary bar.

[0040] Step 3: Heat the secondary bar material to 1160°C in a heating furnace, and then upset the secondary bar material on a forging press to a height of 2 / 5 times the height of the steel ingot to obtain a secondary cake blank. The secondary cake blank is drawn on a forging press and changed back to 9 / 10 times the height of the original steel ...

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Abstract

The invention discloses a fine-grain forging method for a large-size GH690 nickel-based alloy bar billet, and belongs to the technical field of forging. By using the composite technology of ingot billet homogenization and classified forging for preparing the GH690 nickel-based alloy bar billet, the grains of the bar billet for forging can be uniform and fine, thus meeting fine-grain structure homogeneity control requirements on final large-size alloy forgings; classified repeated upsetting-stretching cogging is performed on the basis of controlling a deformation temperature and the deformation amount of each heating number, the forgings are formed by hot upsetting by virtue of end part lubrication and horizontal restrain technologies, and rapidly cooled to eliminate grain coarsening caused by deformation heat effect, and finally, the forging structures with uniform carbides and fine grains are obtained.

Description

technical field [0001] The invention belongs to the technical field of forging, and in particular relates to a fine-grain forging method for a large-size GH690 nickel-based alloy billet. Background technique [0002] GH690 alloy (foreign corresponding brand Inconel690) is a Ni-Cr-Fe base corrosion-resistant deformation superalloy, and its nominal composition is (wt%) Ni-30Cr-10Fe. The high content of Cr makes it have excellent corrosion resistance under various working conditions. Its different product forms, especially large-size alloy forgings, have been widely used in nuclear power, aerospace, ships, petrochemicals and building materials. With the development of nuclear power and other industrial technologies and the increasingly harsh service environment, it is required that the alloy forging should not only have high corrosion resistance, but also have higher tensile strength and fatigue performance. The GH690 alloy only contains a trace amount of C (0.01-0.04wt%) and ...

Claims

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Application Information

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IPC IPC(8): C22F1/10
Inventor 赵明汉颜晓峰马章林张继段春华黄彦奕韩光炜
Owner CENT IRON & STEEL RES INST
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