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Heat treatment method for improving locking performance of GH738 self-locking nut

A heat treatment method, the technology of GH738, which is applied in the field of heat treatment of standard parts, can solve problems such as unqualified locking performance, and achieve the effects of improved grain size, improved strength, and excellent mechanical properties at room temperature

Inactive Publication Date: 2019-03-01
GUIZHOU AEROSPACE PRECISION PRODS
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a heat treatment method for improving the locking performance of GH738 self-locking nuts. This method can effectively adjust the grain size of self-locking nuts to meet product requirements, and at the same time retain the work hardening effect of the product to the greatest extent, thereby improving the product quality. Strength, which solves the problem of unqualified locking performance of products through conventional heat treatment methods

Method used

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Embodiment Construction

[0011] Embodiments of the present invention: improve the heat treatment method of GH738 self-locking nut locking performance, comprise the following steps:

[0012] (1) High-temperature short-time annealing: Put the upset self-locking nut blank into the furnace at a furnace temperature of 850°C, and rapidly raise the temperature to the annealing heating temperature for annealing treatment. After oil cooling; the annealing heat treatment adopts a vacuum oil quenching furnace, the furnace temperature uniformity is ±10°C, and the temperature control accuracy is ±1°C;

[0013] (2) Stabilization treatment: put the blank into the furnace and keep it warm for 4 hours at a temperature of 840°C;

[0014] (3) Aging treatment: put the blank into a furnace, and keep it warm for 16 hours at a temperature of 760°C.

[0015] In the present invention, the high-temperature short-time annealing treatment is carried out after the solid-solution state raw materials are used to make the blank, an...

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Abstract

The invention discloses a heat treatment method for improving the locking performance of a GH738 self-locking nut. The method comprises the steps that after solid and solution state raw materials areforged into a blank, high-temperature short-time annealing treatment is conducted, crystalline grains refined by forging of the surface layer of the blank are adjusted to the 2-6 level range of standard requirements, the deformation strengthening effect produced by forging is kept to the greatest extent at the same time, and after stabilization and aging treatment, the strength of the product is improved by one level compared with a conventional heat treatment method. In addition, the relatively fine crystalline grain size can be obtained through short-time heat treatment, and the coarse crystalline grain phenomenon caused by long-time heat preservation is avoided.

Description

technical field [0001] The invention relates to a heat treatment method for improving the locking performance of a GH738 self-locking nut, which belongs to the technical field of heat treatment of standard parts. Background technique [0002] GH738 is a nickel-based superalloy that is precipitation-hardened by the γ′ phase. It has good combustion and corrosion resistance, high yield strength and fatigue performance. The alloy is widely used in aero-engine gas turbines, as turbine blades, rotating parts of turbine discs, fasteners, etc., and the service temperature can reach 815°C. Although its high cobalt content limits the large-scale use of this alloy, it is still difficult to be replaced by other alloys in some specific parts. This alloy is still widely used in aero-engine self-locking nut fasteners. The technical requirements of the current GH738 self-locking nut are: 1) hardness 34-44HRC; 2) grain size 2-6; 3) locking performance (including room temperature durability ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/26C21D9/00C21D1/773
CPCC21D1/26C21D1/773C21D9/0068
Inventor 刘勇德樊开伦裴烈勇王运兰戴爱丽徐韬
Owner GUIZHOU AEROSPACE PRECISION PRODS
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