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Local ion nitriding method for inner cavity of precipitation-hardening stainless steel annular part

A precipitation hardening, ring-shaped part technology, applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve problems such as inability to meet the requirements of use

Pending Publication Date: 2022-03-01
SHANGHAI AEROSPACE EQUIP MFG GENERAL FACTORY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, after the 05Cr17Ni4Cu4Nb precipitation hardening stainless steel has undergone solid solution and aging treatment, the maximum hardness can only reach about 41-44HRC, which cannot meet the use requirements.

Method used

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  • Local ion nitriding method for inner cavity of precipitation-hardening stainless steel annular part
  • Local ion nitriding method for inner cavity of precipitation-hardening stainless steel annular part
  • Local ion nitriding method for inner cavity of precipitation-hardening stainless steel annular part

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Experimental program
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Effect test

Embodiment 1

[0037] see Figure 1-4 , including the following steps:

[0038] Step S1, the detailed description is as follows:

[0039] The anti-seepage frock (2) is manufactured according to the size and shape of the precipitation-hardened stainless steel ring part (1). The shape of the part is a ring structure; the inner cavity has a ring-shaped protruding step, and the surface to be nitrided is an inner circular surface (11) on the protruding step. The anti-seepage tooling (2) is composed of a component (21) and a component (22). The component (21) covers the upper surface of the part, and the middle through hole exposes a part of the surface of the inner cavity that needs nitriding, and covers the parts of the inner cavity that do not need to be nitrided; the component (22) It is placed under the inner cavity of the part, with a through hole in the middle, exposing the partial surface of the inner cavity that needs nitriding, and covering the inner cavity that does not need nitriding...

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Abstract

The invention relates to a local ion nitriding method for an inner cavity of a 05Cr17Ni4Cu4Nb precipitation hardening stainless steel annular part. The method comprises the following steps: designing an anti-seepage tool, protecting the outer surface of a part and the part, which does not need to be nitrided, of an inner cavity, putting the part into an ion nitriding furnace, introducing nitriding gas, controlling the gas flow, adjusting electrical parameters in the nitriding process, raising the temperature in the furnace to the required nitriding temperature, keeping the temperature at the nitriding temperature, and slowly cooling. By means of the method, the hardness and depth of a nitriding layer of the part, needing nitriding, in the 05Cr17Ni4Cu4Nb precipitation hardening stainless steel annular part meet the technical requirements, and no nitriding layer exists on the other parts under protection of a tool; and the matrix hardness is not changed.

Description

technical field [0001] The invention relates to the technical field of chemical heat treatment, in particular to a portable automatic online verification device for feeler gauges. Background technique [0002] 05Cr17Ni4Cu4Nb is a typical martensitic precipitation hardening stainless steel. After solid solution and aging, the precipitation hardening phase is precipitated and dispersed in the low carbon martensite matrix, thereby improving the strength of the material. At the same time, the material has excellent corrosion resistance and is widely used in aerospace products. [0003] The ring part uses 05Cr17Ni4Cu4Nb as the raw material, which is used in the spherical unlocking device and is a part that acts as a limit for the locking sleeve. After the unlocking device is unlocked, the locking sleeve strikes against the spring cover part. In order to prevent damage to the contact surface, the contact surface is required to have a high hardness ≥ 50HRC. However, after 05Cr17...

Claims

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Application Information

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IPC IPC(8): C23C8/38C23C8/04
CPCC23C8/38C23C8/04
Inventor 吕超君王健波张天德唐丽娜肖金涛鞠鹏飞吴杏萍王正波
Owner SHANGHAI AEROSPACE EQUIP MFG GENERAL FACTORY
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