Afterheat heat treatment method for guaranteeing grain size of GH738 supporting plate self-locking nut

A technology of GH738 and heat treatment method, which is applied in the field of residual temperature heat treatment to ensure the grain size of GH738 pallet self-locking nuts, can solve the problems affecting grain refinement and grain growth, and achieve the effect of improving strength and plasticity

Pending Publication Date: 2021-07-23
GUIZHOU AEROSPACE PRECISION PRODS
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, high-temperature short-time annealing will cause grain growth

Method used

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  • Afterheat heat treatment method for guaranteeing grain size of GH738 supporting plate self-locking nut
  • Afterheat heat treatment method for guaranteeing grain size of GH738 supporting plate self-locking nut
  • Afterheat heat treatment method for guaranteeing grain size of GH738 supporting plate self-locking nut

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Experimental program
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Effect test

Embodiment 1

[0028] A residual temperature heat treatment method to ensure the grain size of the GH738 pallet self-locking nut, specifically including the following process:

[0029] (1) Hot heading forming: The initial forging temperature of the billet is controlled at 1020-1150°C, and the induction heater is used for heating. The heater setting parameter is 180-200A, and the heating time is 10-11 seconds. The overall heating is completed after heating. Hot heading forming.

[0030] (2) Remaining temperature annealing treatment: After hot heading forming, use the remaining temperature of hot heading forming (residual temperature is above 600°C), quickly put it into the heating furnace and keep it at 1070°C for 5-7 minutes, and then air cool or quickly heat it out of the furnace Cool to room temperature; during the heating process, the heating furnace adopts a mesh belt furnace, the furnace temperature uniformity is ±10°C, and the temperature control accuracy is ±1°C;

[0031] (3) Machini...

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Abstract

The invention belongs to the technical field of aero-engine part heat treatment, and particularly relates to an afterheat heat treatment method for guaranteeing the grain size of a GH738 supporting plate self-locking nut. After a nut blank is subjected to hot upsetting forming, furnace returning with afterheat is conducted for heating treatment; and then machining is carried out, and stabilizing treatment and aging treatment are carried out after closing. According to the afterheat heat treatment method, hot upsetting is carried out at the temperature higher than the phase transition temperature of a material, a tissue structure of the material is changed in the deformation process, and then an expected tissue and a deformation tissue are obtained through proper afterheat heat treatment; and the technical problems that after an existing GH738 supporting plate self-locking nut product is subjected to hot upsetting forming, a conventional heat treatment technology is adopted, consequently, the grain size is unqualified, the locking performance dispersion degree is large, and the product performance requirement cannot be met are solved.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of aircraft engine parts, and in particular relates to a residual temperature heat treatment method for ensuring the grain size of a GH738 pallet self-locking nut. Background technique [0002] GH738 is a γ'-phase precipitation-hardening nickel-based superalloy with a melting point of 1330-1360°C. It has good thermal corrosion resistance, high yield strength and fatigue performance, good process plasticity and stable structure. In China, this alloy has been used more and more widely in the aviation field, and is suitable for manufacturing aero-engine rotating parts that work for a long time below 815°C, such as turbine discs, compressor discs, rotor blades and high-temperature fasteners. The commonly used use temperature is ≤730℃, and the aero-engine pallet self-locking nut products made of GH738 are mainly used to connect and fasten various related parts. [0003] GH738 pallet self-lockin...

Claims

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Application Information

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IPC IPC(8): C22F1/10C22F1/02
CPCC22F1/10C22F1/02
Inventor 王运兰赵才红胡隆伟刘文成樊开伦裴烈勇刘勇德
Owner GUIZHOU AEROSPACE PRECISION PRODS
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