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Method for improving strength of work piece formed by reforming austenitic stainless steel

An austenitic stainless steel and workpiece technology, applied in the field of materials, can solve the problems of the lock tongue deformation of the cup-shaped lock ring and the reduction of the bearing capacity of the lock tongue, and achieve the effects of less oxidation deformation, elimination of sensitivity, and low temperature.

Inactive Publication Date: 2012-10-17
AECC AVIATION POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the washer is added under the cup-shaped lock ring, there will be an additional friction pair, which reduces the friction between the cup-shaped lock ring and the end face of the bearing, so that the end face of the cup-shaped lock ring is no longer worn, but the cup-shaped lock ring After the gasket is added below, the two bolt stress points of the cup-shaped lock ring move 1mm away from the root of the bolt R, resulting in a decrease in the load-bearing capacity of the lock tongue and deformation of the lock tongue of the cup-shaped lock ring

Method used

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  • Method for improving strength of work piece formed by reforming austenitic stainless steel
  • Method for improving strength of work piece formed by reforming austenitic stainless steel
  • Method for improving strength of work piece formed by reforming austenitic stainless steel

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Embodiment 1

[0026] This embodiment is a method for improving the hardness of a chromium and nickel austenitic stainless steel cup lock ring.

[0027] In the use of a certain engine, the cup-shaped lock ring and the bearing cage were rubbed against each other. In order to prevent this rubbing fault from occurring, the central gearbox assembly was assembled with the cup-shaped lock ring and the outer ring with a short centripetal rib. A washer is added between the cylindrical roller bearings, which causes the two lugs of the cup lock ring to be deformed during assembly and use. This embodiment is a method for preventing deformation of the austenitic stainless steel stamping cup-shaped lock ring lugs. The specific process is:

[0028] Step 1. Clean the surface of the cup-shaped lock ring. The surface of the cup-shaped lock ring obtained by stamping is cleaned with aviation washing gasoline.

[0029] Step 2. Install the furnace. Heat the air circulation resistance furnace to 100℃~300℃, put the cl...

Embodiment 2

[0033] This embodiment is a method for improving the tensile strength of chromium and nickel austenitic stainless steel elastic washers. The raw material of the elastic washer is in a cold drawn state and is formed by winding. Winding stress is generated during the forming process. In order to improve the hardness of the elastic washer, the specific process of this embodiment is:

[0034] Step 1. Clean the surface of the elastic gasket. Clean the surface of the wound elastic gasket with aviation washing gasoline.

[0035] Step 2. Install the furnace. The air circulation resistance furnace is heated to 100°C~300°C, and the cleaned elastic gaskets are loaded into the air circulation resistance furnace together with the furnace sample; the furnace temperature uniformity of the air circulation resistance furnace is ±5°C. In this embodiment, the heating temperature of the air circulation resistance furnace is 150°C. The furnace sample and the elastic washer have the same material a...

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Abstract

The invention provides a method for improving the strength of a work piece formed by reforming austenitic stainless steel. The punched austenitic stainless steel is subjected to stress relief heat treatment by a primary air furnace; and the stress relief temperature is lower than a solution treatment temperature. After the stress relief heat treatment, the elongation coefficient of materials is not obviously changed, and the yield strength and the fatigue strength are improved. With the adoption of the technical scheme, the temperature for eliminating the stress of chromium and nickel austenite steel work pieces is low, the oxidization deformation degree of the work piece is small, and grains of the materials do not grow big. Meanwhile, the sensitivity of the steel to the stress corrosion is eliminated and the hardness of the work piece is better controlled; and residual stress is guaranteed not to be released in a use process of the work piece and plastic deformation does not occur.

Description

Technical field [0001] The invention relates to the field of materials, in particular to a method for improving the hardness of a work piece after deformation and strengthening of austenitic stainless steel. Background technique [0002] The titanium element in chromium and nickel austenitic stainless steel is to prevent the tendency of intergranular corrosion after heat preservation in the range of 500~800℃. This material has good plasticity, toughness and stamping properties, but it cannot be strengthened by heat treatment. Cold working strengthening is the only means. In order to prevent parts from deforming during assembly and use, solution treatment is used to eliminate the residual stress of cold working after cold working, which usually results in a decrease in the strength of the part, but the part must have a certain strength during use. Through searching domestic and foreign patent documents and paper databases, martensitic steel can be quenched to increase the hardnes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/767C21D1/30C21D9/00
Inventor 寇录文郭子静王军杨鹏
Owner AECC AVIATION POWER CO LTD