Low-pressure vacuum carbonizing heat treatment method of high-temperature carburized stainless steel

A heat treatment method, high-temperature carburizing technology, applied in coating, metal material coating process, solid-state diffusion coating, etc., can solve the problem of carbide size, poor distribution uniformity, complex composition system and heat treatment process, and hardness in the carburized layer. Performance requires problems such as high service temperature to achieve precise control of penetration layer depth, solve environmental pollution and internal oxidation problems, and improve fatigue performance

Active Publication Date: 2019-05-10
NORTHEASTERN UNIV
View PDF8 Cites 24 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The carburizing treatment is carried out by using the traditional well chamber carburizing furnace and atmosphere carburizing furnace, the carburizing process is difficult to control accurately, the carburizing temperature is low, the carburizing time is long, the energy consumption is large, the oxidation in the carburized layer is serious, and the carbides in the carburized layer The size and uniformity of distribution are poor, and it is difficult to uniformly carburize components with complex shapes, and network carbides are produced during long-term carburization, which reduces the performance of steel
[0003] The Chinese patent application whose publication number is CN103556106A "a kind of preparation method of high-temperature vacuum carburizing layer of 1Cr17Ni2 alloy material", the Chinese patent application whose publication number is CN107829064A "a kind of vacuum carburizing heat treatment process of 12CrNi3A material", and the Chinese patent application whose publication number is CN102899603A Many patents such as the Chinese patent application "M50NiL material low-pressure vacuum carburizing method" involve a low-pressure vacuum carburizing process control method, but the above-mentioned methods are all aimed at different carburizing materials, and the high-temperature carburizing stainless steel material proposed by the present invention and the above-mentioned The materials are different alloy composition systems, containing high content of Cr, Co, Mo, V, W and other elements, the composition system and heat treatment process are more complicated, and the control accuracy of the infiltration layer is difficult, the hardness performance requirements and the service temperature of the material are higher. Therefore, the content of the above-mentioned patent application does not apply to the content of the present invention

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Low-pressure vacuum carbonizing heat treatment method of high-temperature carburized stainless steel
  • Low-pressure vacuum carbonizing heat treatment method of high-temperature carburized stainless steel
  • Low-pressure vacuum carbonizing heat treatment method of high-temperature carburized stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1 is carburized in a double-chamber low-pressure vacuum carburizing furnace, and its heat treatment process steps are as follows: figure 1 As shown, the preset infiltration layer depth is 0.8mm. First, prepare a high-temperature carburized stainless steel sample, the sample composition is C 0.14%, Si 0.2%, Mn0.3%, Cr 13.8%, Co 12.8%, Ni 1.8%, W0.5%, Mo 4.7%, V 0.6%, the balance is Fe and unavoidable impurities. Secondly, a) Clean the surface of the sample to remove oil stains, dry it and put it into the furnace and vacuumize it with an absolute pressure of 20Pa. b) Put the sample into a low-pressure vacuum carburizing furnace and heat it. The heating process is a three-stage heating process. The heating rate is 10°C / min, and it is kept at 650°C, 850°C and 980°C for 1 hour respectively. The carburizing temperature is 980°C. c) Fill the furnace with high-purity acetylene gas, adjust to a stable pressure of 800Pa, and enter the strong infiltration stage. At t...

Embodiment 2

[0049] Carburizing in a double-chamber low-pressure vacuum carburizing furnace, the heat treatment process steps are as follows Figure 5 As shown, the preset infiltration layer depth is 1.0mm. Prepare high-temperature carburized stainless steel material samples, the sample composition is C0.14%, Si 0.25%, Mn 0.4%, Cr13.8%, Co 13%, Ni 1.8%, Mo 4.6%, V0.6%, Nb 0.03 %. Clean the surface of the sample to remove oily dirt, dry it and put it into the furnace and vacuumize it. Put the sample into a low-pressure vacuum carburizing furnace for heating. The heating process is a three-stage heating process. The heating rate is 10°C / min, and the heat preservation is at 650°C, 850°C and 960°C for 1 hour respectively, and the carburizing temperature is 960°C. . Fill the furnace with high-purity acetylene gas, adjust to a stable pressure of 800Pa, and enter the strong infiltration stage. At this time, the decomposition, adsorption and infiltration of acetylene in the furnace will increas...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
depthaaaaaaaaaa
hardnessaaaaaaaaaa
hardnessaaaaaaaaaa
Login to view more

Abstract

The invention relates to a low-pressure vacuum carbonizing heat treatment method of high-temperature carburized stainless steel. The method comprises the treatment steps of low-pressure vacuum carbonizing, quenching, deep cooling and high-temperature tempering; and the steps can be repeatedly performed. The low-pressure vacuum carbonizing process uses a saturated value adjusting method for multi-section pulse carbonizing; a carbonizing agent adopts acetylene gas; the carbonizing temperature is 850-1050 DEG C; the carbonizing pressure is 100-2000 Pa; and the powerful seepage and dispersion circulating period is 20-70 times. The treatment method is safe, energy-saved and environment-friendly, can eliminate intergranular oxidation, realizes precise control of the seepage layer depth, and canguarantee excellent service performances of prepared materials above 400 DEG C.

Description

technical field [0001] The invention relates to a high-temperature carburizing stainless steel low-pressure vacuum carburizing heat treatment method, belonging to the technical field of metal material heat treatment. Background technique [0002] The carburizing treatment is carried out by using the traditional well chamber carburizing furnace and atmosphere carburizing furnace, the carburizing process is difficult to control accurately, the carburizing temperature is low, the carburizing time is long, the energy consumption is large, the oxidation in the carburized layer is serious, and the carbides in the carburized layer The size and uniformity of distribution are poor, and it is difficult to uniformly carburize components with complex shapes, and network carbides are produced during long-term carburization, which reduces the performance of steel. [0003] The Chinese patent application whose publication number is CN103556106A "a kind of preparation method of high-tempera...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/22C21D1/18C21D1/773C21D6/04C22C38/02C22C38/04C22C38/44C22C38/52C22C38/46C22C38/48C22C38/42C22C38/54
Inventor 王昭东田勇王昊杰王斌贾涛王丙兴
Owner NORTHEASTERN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap