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Low-pressure vacuum carburizing heat treatment method for 16Cr3NiWMoVNbE

A heat treatment method and technology of the treatment method, applied in the field of low-pressure vacuum carburizing heat treatment of 16Cr3NiWMoVNbE materials, can solve the problems of carbide size, poor distribution uniformity, long carburizing time, and large energy consumption in the carburized layer, and achieve simple composition and high energy consumption. Fatigue performance, energy saving effect

Inactive Publication Date: 2019-05-10
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent focuses on the secondary carburizing process of different parts of the parts, and adopts the traditional atmosphere carburizing method, but how to solve the problem of long carburizing time, large energy consumption, serious oxidation in the carburized layer, and the size of the carbide in the carburized layer , The problem of poor distribution uniformity is not involved

Method used

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  • Low-pressure vacuum carburizing heat treatment method for 16Cr3NiWMoVNbE
  • Low-pressure vacuum carburizing heat treatment method for 16Cr3NiWMoVNbE
  • Low-pressure vacuum carburizing heat treatment method for 16Cr3NiWMoVNbE

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The steps of the vacuum carburizing heat treatment process example are as follows: the schematic diagram is as follows figure 1 As shown, the experimental steel composition is C 0.17%, Si 0.65%, Mn 0.58%, Cr 2.6%, Ni 1.1%, W 1.2%, Mo 0.45%, V 0.42%, Nb 0.16%, P≤0.010%, S≤ 0.010%, Cu 0.01%, and the balance is iron. In this embodiment, the preset depth of the seepage layer is 1.0mm.

[0052] (1) High-temperature pretreatment: high-temperature tempering process is adopted, that is, the 16Cr3NiWMoVNbE material is tempered at 650 °C for 2 hours.

[0053] (2) Carburizing: Carburizing is carried out in a double-chamber low-pressure vacuum carburizing furnace. The carburizing process includes three stages of feeding and vacuuming, stage heating, and pulse carburizing (strong carburizing and diffusion).

[0054] ① Vacuuming: Clean the surface of the 16Cr3NiWMoVNbE material to remove oil stains, and vacuumize the furnace after feeding, with an absolute pressure of 20Pa.

[005...

Embodiment 2

[0062] The composition of the experimental steel is the same as in Example 1, and the preset depth of the infiltrated layer is 0.8 mm. The steps of the vacuum carburizing heat treatment process example are as follows:

[0063] (1) High temperature pretreatment: adopt high temperature tempering process, temper 16Cr3NiWMoVNbE material at 680°C for 3h.

[0064] (2) Carburizing: Carburizing is carried out in a double-chamber low-pressure vacuum carburizing furnace, as follows:

[0065] ① Vacuuming: Clean the surface of the 16Cr3NiWMoVNbE material to remove oil stains, and vacuumize the furnace after feeding, with an absolute pressure of 25Pa.

[0066] ②Stage heating: the 16Cr3NiWMoVNbE material is austenitized in a low-pressure vacuum carburizing furnace, the carburizing temperature is 950°C, the heating process is a three-stage heating process, and the heating rate is 10°C / min, respectively at 600°C and 800°C and 950°C for 1 hour each.

[0067] ③Pulse carburizing: Fill the fur...

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Abstract

The invention relates to a low-pressure vacuum carburizing heat treatment method for 16Cr3NiWMoVNbE. The treatment method comprises the following steps of high-temperature pretreatment, low-pressure vacuum carburizing, quenching, cold quenching and medium-temperature tempering, specifically, the steps can be carried out repeatedly. The vacuum carburizing process is based on the multi-section pulseprinciple of a saturation value adjustment method, acetylene gas is adopted as a carburizing medium, and a carburizing and diffusion cycle is carried out three to thirty times according to the calculated carbon flux, diffusion coefficient and saturated carbon concentration, specifically, the carburizing temperature is 800-1050 DEG C, and the carburizing pressure is 100-2000 Pa. The method is clean and environmentally friendly, can achieve no intergranular oxidation as well as accurate control over the carburized layer depth; meets reproducibility within a low error range and optionality of the surface carbon concentration, and is suitable for complex structures such as slim holes and blind holes.

Description

technical field [0001] The invention relates to a low-pressure vacuum carburizing heat treatment method for 16Cr3NiWMoVNbE material, which belongs to the technical field of metal material heat treatment. Background technique [0002] 16Cr3NiWMoVNbE steel is a super high-quality steel with good hardenability, high toughness and plasticity and high tensile strength. After surface carburizing and subsequent heat treatment, the surface has high hardness and strength, the core has good toughness and plasticity, and has good forging and cutting performance at the same time. Its service temperature can reach 350 ° C and has good comprehensive performance. , has become a representative of a new generation of aviation gear materials. [0003] The composition of 16Cr3NiWMoVNbE alloy is complex. Carburizing treatment is carried out by using traditional well chamber carburizing furnace and atmosphere carburizing furnace. The size and uniformity of distribution are poor, and it is diff...

Claims

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Application Information

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IPC IPC(8): C23C8/22C21D1/18C21D1/773C21D6/04C22C38/02C22C38/04C22C38/44C22C38/46C22C38/48C22C38/42
Inventor 王斌王昊杰何燕萍田勇贾涛王丙兴王昭东
Owner NORTHEASTERN UNIV
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