WO2019223078A1 - Medium-temperature gas nitrocarburizing quenching process - Google Patents

Medium-temperature gas nitrocarburizing quenching process Download PDF

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WO2019223078A1
WO2019223078A1 PCT/CN2018/095301 CN2018095301W WO2019223078A1 WO 2019223078 A1 WO2019223078 A1 WO 2019223078A1 CN 2018095301 W CN2018095301 W CN 2018095301W WO 2019223078 A1 WO2019223078 A1 WO 2019223078A1
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nitriding
carburizing
argon
layer
furnace
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PCT/CN2018/095301
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French (fr)
Chinese (zh)
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殷文元
钱祥鑫
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江苏万力机械股份有限公司
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Publication of WO2019223078A1 publication Critical patent/WO2019223078A1/en

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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/28—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in one step
    • C23C8/30—Carbo-nitriding
    • C23C8/32—Carbo-nitriding of ferrous surfaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/30—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for crankshafts; for camshafts

Definitions

  • the invention relates to the technical field of metal surface treatment, in particular to a medium temperature gas nitrocarburizing quenching process.
  • Austempered Ductile Iron also referred to as Austempered Ductile Iron (ADI), also known as Austempered Ductile Iron
  • ADI Austempered Ductile Iron
  • austenite isothermal quenching technology a high-strength, high-toughness isothermally quenched ductile iron with a tensile strength greater than 1000 MPa and an elongation greater than 15% was developed.
  • Isothermally quenched ductile iron also has the characteristics of high strength and high toughness. Its comprehensive mechanical properties are significantly better than ferritic ductile iron and pearlite ductile iron.
  • Isothermally quenched ductile iron is an important progress in strengthening and toughening ductile iron. It is hailed as one of the major achievements in the metallurgy of cast iron in the past 30 years and is expected to replace expensive cast steel and forged workpieces.
  • the infiltration layer has high impact toughness and good wear resistance, and the maximum hardness of the infiltration layer is 800HV.
  • the main problems with this document technology are: (1) the use of NH3 + methanol, NH3 and methanol interaction results in the formation of hydrocyanic acid (HCN), which will pollute the environment; (2) no isogroup or aging treatment is performed after the infiltration.
  • the purpose of the present invention is to provide a middle temperature gas nitrocarburizing quenching process in view of the shortcomings of the prior art.
  • a medium-temperature gas nitrocarburizing quenching process the formed crankshaft is put into a fluidized bed particle furnace and heated to 600-800 ° C to perform austenitization; argon gas is passed into the furnace, and argon gas is passed through the furnace.
  • carburizing treatment is performed to form a carburizing layer, and the carburizing time is 20 to 160 minutes; argon is continued, and under the protection of argon, austenitic stainless steel workpieces are subjected to nitriding treatment to form Nitriding layer, the nitriding time is 40 ⁇ 160min; and then quenched at 250-360 °C in a fluidized bed particle furnace.
  • the thickness of the carburizing layer is 4 to 16 ⁇ m, and the carburizing time is 70 minutes.
  • the thickness of the carburized layer is 5 ⁇ m.
  • the thickness of the nitriding layer is 4-12 ⁇ m, and the nitriding time is 80 minutes.
  • the surface hardness of the infiltration layer is greater than 1200 HV.
  • the argon gas flow rate is 12 to 16 L / min.
  • the method of the invention can eradicate the source of hydrocyanic acid by alternating carburizing and nitriding under the condition of continuous introduction of argon gas, and can be used instead of ferrite nitrocarburizing, which not only eliminates the pollution of hydrocyanic acid, but also Increase the depth of the effective hardened layer.
  • the infiltrated layers that are compounded alternately improve the hardness and corrosion resistance of the workpiece, and the process of the invention has the characteristics of fast processing speed and simple process, and is suitable for large-scale popularization.
  • the medium temperature gas nitrocarburizing quenching process of the present invention is characterized in that the formed crankshaft is put into a fluidized bed particle furnace and heated to 600-800 ° C for austenitizing; argon gas is passed into the furnace. Under the protection of argon, carburizing the austenitic stainless steel workpiece to form a carburizing layer, the carburizing time is 20 ⁇ 160min; continue to pass argon, and protect the austenitic stainless steel workpiece under the protection of argon. Nitriding treatment forms a nitriding layer, the nitriding time is 40-160min; and then is quenched isothermally at 250-360 ° C in a fluidized bed particle furnace.
  • the formed crankshaft is heated to 600 ° C by a fluidized bed particle furnace heating device for austenitization; argon gas is introduced into the furnace, and the flow rate of argon gas is 12 L / min.
  • Carburizing treatment of the stainless steel workpiece to form a carburizing layer the thickness of the carburizing layer is 4 ⁇ m, and the carburizing time is 70min; continue to pass argon, under the protection of argon, nitriding the austenitic stainless steel workpiece to form a nitriding layer, The thickness of the nitriding layer is 4 ⁇ m, and the nitriding time is 80 minutes; then, the temperature is quenched at 250 ° C. in a fluidized bed particle furnace.
  • the formed crankshaft is heated to 600 ° C by a fluidized bed particle furnace heating device to perform austenitization; argon gas is introduced into the furnace, and the flow rate of argon gas is 16L / min.
  • Carburizing treatment of the stainless steel workpiece to form a carburizing layer the thickness of the carburizing layer is 6 ⁇ m, and the carburizing time is 90min; continue to pass argon, under the protection of argon, nitriding the austenitic stainless steel workpiece to form a nitriding layer, The thickness of the nitriding layer is 8 ⁇ m, and the nitriding time is 100 minutes. Then, the nitriding layer is quenched at 250 ° C. in a fluidized bed particle furnace.
  • the formed crankshaft was heated to 800 ° C by a fluidized bed particle furnace heating device to perform austenitization; argon gas was introduced into the furnace, and the flow rate of argon gas was 16 L / min.
  • Carburizing treatment of the stainless steel workpiece to form a carburizing layer the thickness of the carburizing layer is 8 ⁇ m, and the carburizing time is 90 minutes; continue to pass argon, under the protection of argon, nitriding the austenitic stainless steel workpiece to form a nitriding layer, The thickness of the nitriding layer is 8 ⁇ m, and the nitriding time is 100 minutes.
  • the nitriding layer is quenched isothermally in a fluidized bed particle furnace at 280 ° C.
  • the method of the invention can eradicate the source of hydrocyanic acid by alternating carburizing and nitriding under the condition of continuous introduction of argon gas, and can be used instead of ferrite nitrocarburizing, which not only eliminates the pollution of hydrocyanic acid, but also Increase the depth of the effective hardened layer.
  • the infiltrated layers that are compounded alternately improve the hardness and corrosion resistance of the workpiece, and the process of the invention has the characteristics of fast processing speed and simple process, and is suitable for large-scale popularization.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)

Abstract

The present invention provides a medium-temperature gas nitrocarburizing quenching process, comprising: placing a formed crankshaft in a fluidized bed particle furnace to be heated to 600-800°C, and performing austenitizing; introducing argon into the furnace, and performing a carburizing treatment on an austenitic stainless steel workpiece to form a carburized layer under the protection of argon, a carburizing time duration being 20-160 min; continuing introducing argon, and performing a nitriding treatment on the austenitic stainless steel workpiece to form a nitrided layer under the protection of argon, a nitriding time duration being 40-160 min; and then performing isothermal quenching in the fluidized bed particle furnace at 250-360°C. According to the method, the carburizing treatment and the nitriding treatment are performed alternately under the condition of introducing argon continuously, the causes for producing hydrocyanic acid can be eliminated, and the hardness and the corrosion resistance of the workpiece are improved by means of a nitrocarburized layer formed by compounding alternately. Moreover, the process is fast in treatment speed and simple in process, and is suitable for large-scale popularization and use.

Description

一种中温气体氮碳共渗淬火工艺Medium temperature gas nitrocarburizing quenching process 技术领域Technical field
本发明涉及金属表面处理技术领域，尤其涉及一种中温气体氮碳共渗淬火工艺。The invention relates to the technical field of metal surface treatment, in particular to a medium temperature gas nitrocarburizing quenching process.
背景技术Background technique
奥氏体等温淬火球墨铸铁(Austempered Ductile Iron)，简称等温淬火球铁(ADI)，也称奥贝球铁，具有比普通球铁更优良的综合力学性能，尤其是突出的弯曲疲劳性能和高的耐磨性，引起了材料科学工作者及工程技术人员的广泛关注。利用奥氏体等温淬火技术开发出抗拉强度大于1000MPa、伸长率超过15％的高强度、高韧性的等温淬火球铁。等温淬火球铁同时具有高强度、高韧性的特点，其综合力学性能明显优于铁素体球铁及珠光体球铁，其铸造性能、耐热性、耐蚀性、耐磨性、减振性、切削性、经济性等特性优于铸钢，被认为是“真正的廉价新材料”。等温淬火球铁是球铁强韧化方面的一个重要进展，被誉为近30年来铸铁冶金学方面的重大成就之一，被期望用来替代价格昂贵的铸钢及锻造工件。Austempered Ductile Iron (Austempered Ductile Iron), also referred to as Austempered Ductile Iron (ADI), also known as Austempered Ductile Iron, has better comprehensive mechanical properties than ordinary ductile iron, especially outstanding bending fatigue performance and high The abrasion resistance has attracted widespread attention from materials scientists and engineering technicians. Using austenite isothermal quenching technology, a high-strength, high-toughness isothermally quenched ductile iron with a tensile strength greater than 1000 MPa and an elongation greater than 15% was developed. Isothermally quenched ductile iron also has the characteristics of high strength and high toughness. Its comprehensive mechanical properties are significantly better than ferritic ductile iron and pearlite ductile iron. Its casting properties, heat resistance, corrosion resistance, wear resistance, vibration reduction Its properties such as flexibility, machinability and economy are superior to those of cast steel, and are considered to be "really cheap new materials." Isothermally quenched ductile iron is an important progress in strengthening and toughening ductile iron. It is hailed as one of the major achievements in the metallurgy of cast iron in the past 30 years and is expected to replace expensive cast steel and forged workpieces.
经文献检索发现，程晓敏等人在《武汉工学院学报》，VOL.14，NO.3，1992.9，P.64-70上发表“奥氏体氮碳共渗渗层组织与性能的研究”，该文介绍了实验用材料为15钢，采用NH3+甲醇在650℃×2小时进行奥氏体氮碳共渗，渗层由化合物层、奥氏体层和扩散层组成，化合物主要由ε和γ′组成。此文采用正交实验法找出最佳共渗工艺参数，做了组织分析和性能实验，得出渗层有较高的冲击韧性和良好的耐磨性，渗层最高硬度为800HV。该文献技术存在的主要问题是：(1)采用NH3+甲醇，NH3和甲醇相互作用结果必然会生成氢氰酸(HCN)，污染环境；(2)共渗后没有进行等组或时效处理。Through literature search, it was found that Cheng Xiaomin et al. Published "Research on Microstructure and Properties of Austenitic Nitrogen and Carbonitriding Layer" in Journal of Wuhan Institute of Technology, VOL.14, NO.3, 1992.9, P.64-70, This article introduces that the experimental material is 15 steel. Austenitic nitrocarburizing is performed at 650 ° C for 2 hours with NH3 + methanol. The infiltrated layer consists of a compound layer, an austenite layer, and a diffusion layer. The compounds are mainly composed of ε and γ. 'composition. In this paper, orthogonal test method is used to find the best infiltration process parameters. Microstructure analysis and performance experiments are performed. It is concluded that the infiltration layer has high impact toughness and good wear resistance, and the maximum hardness of the infiltration layer is 800HV. The main problems with this document technology are: (1) the use of NH3 + methanol, NH3 and methanol interaction results in the formation of hydrocyanic acid (HCN), which will pollute the environment; (2) no isogroup or aging treatment is performed after the infiltration.
发明内容：Summary of the invention:
技术问题：本发明的目的是针对现有技术的不足，提供一种中温气体氮碳共渗淬火工艺。Technical problem: The purpose of the present invention is to provide a middle temperature gas nitrocarburizing quenching process in view of the shortcomings of the prior art.
技术方案：为了达到上述的目的，本发明是通过以下技术方案来实现的：Technical solution: In order to achieve the above-mentioned object, the present invention is achieved by the following technical solutions:
本发明的一种中温气体氮碳共渗淬火工艺，将成型后的曲轴投入流态床粒子炉中升温到600-800℃，进行奥氏体化；向炉中通入氩气，在氩气的保护下,对 奥氏体不锈钢工件进行渗碳处理形成渗碳层，渗碳时间20～160min；继续通入氩气，在氩气的保护下,对奥氏体不锈钢工件进行渗氮处理形成渗氮层，渗氮时间40～160min；然后在流态床粒子炉中250-360℃等温淬火。In the invention, a medium-temperature gas nitrocarburizing quenching process, the formed crankshaft is put into a fluidized bed particle furnace and heated to 600-800 ° C to perform austenitization; argon gas is passed into the furnace, and argon gas is passed through the furnace. Under the protection of austenitic stainless steel workpieces, carburizing treatment is performed to form a carburizing layer, and the carburizing time is 20 to 160 minutes; argon is continued, and under the protection of argon, austenitic stainless steel workpieces are subjected to nitriding treatment to form Nitriding layer, the nitriding time is 40 ~ 160min; and then quenched at 250-360 ℃ in a fluidized bed particle furnace.
优选地，渗碳层厚度4～16μm，述渗碳时间70min。Preferably, the thickness of the carburizing layer is 4 to 16 μm, and the carburizing time is 70 minutes.
优选地，所所述渗碳层厚度5μm。Preferably, the thickness of the carburized layer is 5 μm.
优选地，渗氮层厚度4～12μm，渗氮时间80min。Preferably, the thickness of the nitriding layer is 4-12 μm, and the nitriding time is 80 minutes.
优选地，所述渗层的表面硬度大于1200HV。Preferably, the surface hardness of the infiltration layer is greater than 1200 HV.
优选地，氩气流量为12～16L/min。Preferably, the argon gas flow rate is 12 to 16 L / min.
有益效果：与现有技术相比，本发明的有益效果是：Beneficial effects: Compared with the prior art, the beneficial effects of the present invention are:
本发明方法通过在持续通入氩气的条件下交替渗碳、渗氮、可以根除产生氢氰酸的根源，用来代替铁素体氮碳共渗，不仅根除氢氰酸地污染，还能提高有效硬化层的深度。交替复合而成的渗层提高了工件的硬度和耐蚀性，并且本发明的工艺具有处理速度快，工艺简单的特点，适合于大规模推广使用。The method of the invention can eradicate the source of hydrocyanic acid by alternating carburizing and nitriding under the condition of continuous introduction of argon gas, and can be used instead of ferrite nitrocarburizing, which not only eliminates the pollution of hydrocyanic acid, but also Increase the depth of the effective hardened layer. The infiltrated layers that are compounded alternately improve the hardness and corrosion resistance of the workpiece, and the process of the invention has the characteristics of fast processing speed and simple process, and is suitable for large-scale popularization.
具体实施方式Detailed ways
下面来说明本发明的实施例。在本发明的一种实施方式中描述的元素和特征可以与一个或更多个其它实施方式中示出的元素和特征相结合。应当注意，为了清楚的目的，说明中省略了与本发明无关的、本领域普通技术人员已知的部件和处理的表示和描述。Examples of the present invention will be described below. Elements and features described in one embodiment of the present invention may be combined with elements and features shown in one or more other embodiments. It should be noted that, for the sake of clarity, representations and descriptions of components and processes not related to the present invention and known to those of ordinary skill in the art are omitted in the description.
本发明的一种中温气体氮碳共渗淬火工艺，其特征在于，将成型后的曲轴投入流态床粒子炉中升温到600-800℃，进行奥氏体化；向炉中通入氩气，在氩气的保护下,对奥氏体不锈钢工件进行渗碳处理形成渗碳层，渗碳时间20～160min；继续通入氩气，在氩气的保护下,对奥氏体不锈钢工件进行渗氮处理形成渗氮层，渗氮时间40～160min；然后在流态床粒子炉中250-360℃等温淬火。The medium temperature gas nitrocarburizing quenching process of the present invention is characterized in that the formed crankshaft is put into a fluidized bed particle furnace and heated to 600-800 ° C for austenitizing; argon gas is passed into the furnace. Under the protection of argon, carburizing the austenitic stainless steel workpiece to form a carburizing layer, the carburizing time is 20 ~ 160min; continue to pass argon, and protect the austenitic stainless steel workpiece under the protection of argon. Nitriding treatment forms a nitriding layer, the nitriding time is 40-160min; and then is quenched isothermally at 250-360 ° C in a fluidized bed particle furnace.
实施例1Example 1
将成型的曲轴经流态床粒子炉加热设备加热至600℃，进行奥氏体化；向炉中通入氩气，氩气流量为12L/min，在氩气的保护下,对奥氏体不锈钢工件进行渗碳处理形成渗碳层，渗碳层厚度4μm，渗碳时间70min；继续通入氩气，在氩气的保护下,对奥氏体不锈钢工件进行渗氮处理形成渗氮层，渗氮层厚度4μm，渗氮时间80min；然后在流态床粒子炉中250℃等温淬火。The formed crankshaft is heated to 600 ° C by a fluidized bed particle furnace heating device for austenitization; argon gas is introduced into the furnace, and the flow rate of argon gas is 12 L / min. Carburizing treatment of the stainless steel workpiece to form a carburizing layer, the thickness of the carburizing layer is 4μm, and the carburizing time is 70min; continue to pass argon, under the protection of argon, nitriding the austenitic stainless steel workpiece to form a nitriding layer, The thickness of the nitriding layer is 4 μm, and the nitriding time is 80 minutes; then, the temperature is quenched at 250 ° C. in a fluidized bed particle furnace.
实施例2Example 2
将成型的曲轴经流态床粒子炉加热设备加热至600℃，进行奥氏体化；向炉中通入氩气，氩气流量为16L/min，在氩气的保护下,对奥氏体不锈钢工件进行渗碳处理形成渗碳层，渗碳层厚度6μm，渗碳时间90min；继续通入氩气，在氩气的保护下,对奥氏体不锈钢工件进行渗氮处理形成渗氮层，渗氮层厚度8μm，渗氮时间100min；然后在流态床粒子炉中250℃等温淬火。The formed crankshaft is heated to 600 ° C by a fluidized bed particle furnace heating device to perform austenitization; argon gas is introduced into the furnace, and the flow rate of argon gas is 16L / min. Carburizing treatment of the stainless steel workpiece to form a carburizing layer, the thickness of the carburizing layer is 6μm, and the carburizing time is 90min; continue to pass argon, under the protection of argon, nitriding the austenitic stainless steel workpiece to form a nitriding layer, The thickness of the nitriding layer is 8 μm, and the nitriding time is 100 minutes. Then, the nitriding layer is quenched at 250 ° C. in a fluidized bed particle furnace.
实施例3Example 3
将成型的曲轴经流态床粒子炉加热设备加热至800℃，进行奥氏体化；向炉中通入氩气，氩气流量为16L/min，在氩气的保护下,对奥氏体不锈钢工件进行渗碳处理形成渗碳层，渗碳层厚度8μm，渗碳时间90min；继续通入氩气，在氩气的保护下,对奥氏体不锈钢工件进行渗氮处理形成渗氮层，渗氮层厚度8μm，渗氮时间100min；然后在流态床粒子炉中280℃等温淬火。The formed crankshaft was heated to 800 ° C by a fluidized bed particle furnace heating device to perform austenitization; argon gas was introduced into the furnace, and the flow rate of argon gas was 16 L / min. Carburizing treatment of the stainless steel workpiece to form a carburizing layer, the thickness of the carburizing layer is 8 μm, and the carburizing time is 90 minutes; continue to pass argon, under the protection of argon, nitriding the austenitic stainless steel workpiece to form a nitriding layer, The thickness of the nitriding layer is 8 μm, and the nitriding time is 100 minutes. Then, the nitriding layer is quenched isothermally in a fluidized bed particle furnace at 280 ° C.
本发明方法通过在持续通入氩气的条件下交替渗碳、渗氮、可以根除产生氢氰酸的根源，用来代替铁素体氮碳共渗，不仅根除氢氰酸地污染，还能提高有效硬化层的深度。交替复合而成的渗层提高了工件的硬度和耐蚀性，并且本发明的工艺具有处理速度快，工艺简单的特点，适合于大规模推广使用。The method of the invention can eradicate the source of hydrocyanic acid by alternating carburizing and nitriding under the condition of continuous introduction of argon gas, and can be used instead of ferrite nitrocarburizing, which not only eliminates the pollution of hydrocyanic acid, but also Increase the depth of the effective hardened layer. The infiltrated layers that are compounded alternately improve the hardness and corrosion resistance of the workpiece, and the process of the invention has the characteristics of fast processing speed and simple process, and is suitable for large-scale popularization.
最后应说明的是：显然，上述实施例仅仅是为清楚地说明本发明所作的举例，而并非对实施方式的限定。对于所属领域的普通技术人员来说，在上述说明的基础上还可以做出其它不同形式的变化或变动。这里无需也无法对所有的实施方式予以穷举。而由此所引申出的显而易见的变化或变动仍处于本发明的保护范围之中。Finally, it should be explained that, obviously, the above-mentioned embodiments are merely examples for clearly explaining the present invention, and are not intended to limit the embodiments. For those of ordinary skill in the art, other different forms of changes or modifications can be made on the basis of the above description. There is no need and cannot be exhaustive for all implementations. The obvious changes or variations derived from this are still within the protection scope of the present invention.

Claims (6)

  1. 一种中温气体氮碳共渗淬火工艺，其特征在于，将成型后的曲轴投入流态床粒子炉中升温到600-800℃，进行奥氏体化；向炉中通入氩气，在氩气的保护下,对奥氏体不锈钢工件进行渗碳处理形成渗碳层，渗碳时间20～160min；继续通入氩气，在氩气的保护下,对奥氏体不锈钢工件进行渗氮处理形成渗氮层，渗氮时间40～160min；然后在流态床粒子炉中250-360℃等温淬火。A medium temperature gas nitrocarburizing quenching process, characterized in that the crankshaft after forming is put into a fluidized bed particle furnace to be heated to 600-800 ° C for austenitization; argon gas is passed into the furnace, and Carburizing treatment of austenitic stainless steel workpieces under the protection of gas to form a carburized layer, carburizing time of 20 to 160min; continue to argon, under the protection of argon, nitriding the austenitic stainless steel workpieces A nitriding layer is formed, and the nitriding time is 40 to 160 minutes; then, it is quenched isothermally in a fluidized bed particle furnace at 250-360 ° C.
  2. 根据根据权利要求1所述的一种高强度曲轴的生产方法，其特征在于，渗碳层厚度4～16μm，述渗碳时间70min。The method for producing a high-strength crankshaft according to claim 1, wherein the thickness of the carburizing layer is 4 to 16 μm, and the carburizing time is 70 minutes.
  3. 根据根据权利要求1所述的一种高强度曲轴的生产方法，其特征在于，所所述渗碳层厚度5μm。The method for producing a high-strength crankshaft according to claim 1, wherein the thickness of the carburized layer is 5 μm.
  4. 根据根据权利要求1所述的一种高强度曲轴的生产方法，其特征在于，渗氮层厚度4～12μm，渗氮时间80min。The method for producing a high-strength crankshaft according to claim 1, wherein the thickness of the nitriding layer is 4-12 μm, and the nitriding time is 80 minutes.
  5. 根据根据权利要求1所述的一种高强度曲轴的生产方法，其特征在于，所述渗层的表面硬度大于1200HV。The method for producing a high-strength crankshaft according to claim 1, wherein a surface hardness of the infiltration layer is greater than 1200 HV.
  6. 根据根据权利要求1所述的一种高强度曲轴的生产方法，其特征在于，氩气流量为12～16L/min。The method for producing a high-strength crankshaft according to claim 1, wherein the flow rate of argon gas is 12 to 16 L / min.
PCT/CN2018/095301 2018-05-21 2018-07-11 Medium-temperature gas nitrocarburizing quenching process WO2019223078A1 (en)

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