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Heat treatment method for improving tensile plasticity of GH3690 alloy

A technology of GH3690 and heat treatment method, which is applied in the field of heat treatment process of GH3690 alloy, can solve the problems of no further improvement and less research on alloy tensile properties

Inactive Publication Date: 2019-05-31
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the preparation and processing of the pipe are closely related to the plastic properties of the alloy itself, there are few studies on adjusting the heat treatment process to improve the tensile properties of the alloy, and no further improvement methods have been proposed.

Method used

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  • Heat treatment method for improving tensile plasticity of GH3690 alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Commercial GH3690 alloy pipes are used, and the composition is shown in Table 1.

[0025] Ni

Cr

Fe

C

Si

mn

S

Cu

≥58

27～31

7～11

≤0.05

≤0.5

≤0.5

≤0.015

≤0.5

[0026] (2) A commercial heat treatment furnace is used.

[0027] (3) Raise the furnace temperature to 1065°C-1075°C for 270-330 seconds.

[0028] (4) After the heat treatment is completed, the sample is air-cooled.

[0029] (5) The sample after heat treatment is carried out tensile test test under different temperatures, and the obtained result is as follows figure 1 shown. It can be seen that after heat treatment, the tensile plasticity of the alloy can reach more than 47.6% in the low plasticity zone, and the highest can reach 62.1%.

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Abstract

The invention belongs to the field of nickel-based alloys, and relates to a heat treatment method for improving the tensile plasticity of GH3690 alloy. Commercial GH3690 alloy is adopted as an objectto be subjected to heat treatment through a commercial heat treatment furnace, and the alloy is subjected to solid solution heat treatment at the temperature of 1065-1075 DEG C for 270-330 seconds tofinally obtain the high-tensile-plasticity alloy. Compared with aged alloy, the alloy disclosed by the invention has the advantages that the tensile plasticity is remarkably improved, the preparationand processing capability of the alloy is improved. According to the GH3690 alloy prepared by the method, a low plastic zone can reach 47.6% or more and can be up to 62.1%, and the alloy has a good application prospect.

Description

technical field [0001] The invention belongs to the field of nickel-based alloys, and relates to a method for preparing and improving the tensile plasticity of a GH3690 alloy in a medium-temperature zone, in particular to a heat treatment process of the GH3690 alloy. Background technique [0002] GH3690 (Inconel 690) alloy is an austenitic nickel-based corrosion-resistant alloy with a 30% chromium content. It not only has better corrosion resistance than Inconel 600, Incoloy 800, 304 stainless steel, etc. Excellent resistance to stress corrosion cracking, high strength, good metallurgical stability and excellent processing characteristics, so it becomes an ideal tube for nuclear power steam generators. The GH3690 alloy pipes for steam generators used by nuclear power plants in various countries in the world today are listed as "Nuclear Class I" components for their importance. Under the background of my country's active development of nuclear power, the construction of 2 mi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/10
Inventor 郑磊
Owner UNIV OF SCI & TECH BEIJING
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