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A heat treatment method for high-temperature carburizing stainless steel and low-pressure vacuum carburizing

A heat treatment method and high temperature carburizing technology, applied in solid diffusion coating, coating, metal material coating process, etc., can solve the problem of carbide size, poor distribution uniformity, complex composition system and heat treatment process, hardness The performance requires high service temperature to achieve the effect of accurately controlling the depth of the seepage layer, solving environmental pollution and internal oxidation, and achieving good comprehensive performance.

Active Publication Date: 2020-01-17
NORTHEASTERN UNIV LIAONING
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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

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  • A heat treatment method for high-temperature carburizing stainless steel and low-pressure vacuum carburizing
  • A heat treatment method for high-temperature carburizing stainless steel and low-pressure vacuum carburizing
  • A heat treatment method for high-temperature carburizing stainless steel and low-pressure vacuum carburizing

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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...

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Abstract

The invention relates to a low-pressure vacuum carburizing heat treatment method for high-temperature carburized stainless steel. The process steps include low-pressure vacuum carburizing, quenching, cryogenic treatment, and high-temperature tempering, and the above steps can be repeated. Among them, the low-pressure vacuum carburizing process uses the saturated value adjustment method for multi-stage pulse carburizing. The carburizing agent uses acetylene gas. The carburizing temperature is 850~1050℃, the carburizing pressure is 100~2000Pa, and the strong carburizing and diffusion cycle is 20~70 times. . The treatment method of the present invention is safe, energy-saving and environmentally friendly, can eliminate intergranular oxidation, and achieve precise control of the penetration layer depth. The prepared material can ensure good service performance above 400°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

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Application Information

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Patent Type & Authority Patents(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 LIAONING
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