CN105586564A - 一种渗氮钢氮化处理的冷却工艺 - Google Patents

一种渗氮钢氮化处理的冷却工艺 Download PDF

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Publication number
CN105586564A
CN105586564A CN201510996075.4A CN201510996075A CN105586564A CN 105586564 A CN105586564 A CN 105586564A CN 201510996075 A CN201510996075 A CN 201510996075A CN 105586564 A CN105586564 A CN 105586564A
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Prior art keywords
parts
cooling
stove
temperature
furnace
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CN201510996075.4A
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Inventor
张文朝
郭长建
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Sibote Bearing Technology R & D Co Ltd Shanghai
C&U Group Ltd
Shanghai C&U Group Co Ltd
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Sibote Bearing Technology R & D Co Ltd Shanghai
C&U Group Ltd
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Priority to CN201510996075.4A priority Critical patent/CN105586564A/zh
Publication of CN105586564A publication Critical patent/CN105586564A/zh
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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
    • 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
    • C23C8/80—After-treatment

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)

Abstract

本发明涉及一种渗氮钢氮化处理的冷却工艺，在零件渗氮热处理之后，零件随炉冷却至在不低于450℃温度下出炉，出炉后的零件快速放入油槽内进行油冷却。上述工艺下，零件在450℃以上温度出炉，避免产生高温氧化作用和有效控制脉状氮化物的析出，之后快速进入油槽内进行油冷却，油冷却有效避免脉状氮化物的析出，避免氮原子从a-Fe中析出，从而达到避免零件在随炉冷却后的表面和心部产生脉状分布的氮化物，有效的提高零件的性能和使用寿命，经试验失效件的比例由原来的30％下降为5％，而且具有工艺简单，易于实现，成本低廉的优点。

Description

一种渗氮钢氮化处理的冷却工艺
技术领域
本发明涉及钢合金的渗氮热处理工艺，确切的说是渗氮热处理中的冷却工艺。
背景技术
普通的渗氮钢（如轴承保持架）在氮化工艺结束后冷却过程是随炉冷却至180℃左右，在冷却过程中经常出现较多呈脉状分布的氮化物，如图1所示的零件显微组织图。由于心部存在较多的脉状分布的氮化物，易引起渗氮钢的疲劳强度下降，同时增加了脆性，严重者导致断裂等问题。
发明内容
本发明发明目的：为克服现有技术存在的缺陷，本发明提供一种可有效避免脉状氮化物析出的渗氮钢氮化处理的冷却工艺，有效提高渗氮钢的耐磨性，强度等机械性能，延长零件使用寿命。
为实现上述目的，本发明提供了如下技术方案：一种渗氮钢氮化处理的冷却工艺，在零件渗氮热处理之后，零件随炉冷却至在不低于450℃温度下出炉，出炉后的零件快速放入油槽内进行油冷却。
优选的，所述零件随炉冷却温度至450℃～500℃下出炉。该步骤下有效避免产品表面产生过度的氧化。
本发明的有益效果为：零件气体软氮化通常在NH3和CO2气氛下进行，在一定的温度下发生气相反应，产生的活性氮和碳原子吸附在钢的表面，并向内部扩散，随着碳、氮原子浓度分布的不同，在钢的表面形成不同结构的含氮化合物及扩散层，零件在450℃以上温度出炉，避免产生高温氧化作用和有效控制脉状氮化物的析出，之后快速进入油槽内进行油冷却，由于零件心部为含氮的过饱和a-Fe固溶体，油冷却有效避开了析出针状γ相氮化物的区域，避免脉状氮化物的析出，避免氮原子从a-Fe中析出。从而达到避免零件在随炉冷却后的表面和心部产生脉状分布的氮化物，有效的提高零件的性能和使用寿命，经试验失效件的比例由原来的30％下降为5％；而且其具有工艺简单，易于实现，成本低廉的优点。
下面结合附图对本发明作进一步描述。
附图说明
图1为现有渗氮钢氮化处理的冷却工艺下零件显微组织图；
图2为本发明渗氮钢氮化处理的冷却工艺在零件随炉冷却至500℃条件下零件显微组织图；
图3为本发明渗氮钢氮化处理的冷却工艺在零件随炉冷却至450℃条件下零件显微组织图；
图4为本发明渗氮钢氮化处理的冷却工艺在零件随炉冷却至430℃条件下零件显微组织图。
具体实施方式
下面通过实施例对本发明进行具体的描述，只用于对本发明进行进一步说明，不能理解为对本发明保护范围的限定，该领域的技术工程师可根据上述发明的内容对本发明作出一些非本质的改进和调整。
实施例1
将零件试样置于NH3和CO2气氛下在井式炉内进行常规的渗氮热处理，在零件渗氮热处理之后，零件随炉冷却至在500℃温度下出炉，出炉后的零件快速放入油槽内进行油冷却。
如图2所示，软氮化热处理后的试样在金相观察图，心部无脉状分布的氮化物组织。
实施例2
将零件试样置于NH3和CO2气氛下在井式炉内进行常规的渗氮热处理，在零件渗氮热处理之后，零件随炉冷却至在450℃温度下出炉，出炉后的零件快速放入油槽内进行油冷却。
如图3所示，软氮化热处理后的试样在金相观察图，心部无脉状分布的氮化物组织。
实施例3
将零件试样置于NH3和CO2气氛下在井式炉内进行常规的渗氮热处理，在零件渗氮热处理之后，零件随炉冷却至在430℃温度下出炉，出炉后的零件快速放入油槽内进行油冷却。
如图4所示，软氮化热处理后的试样在金相观察图，心部存在脉状分布的氮化物组织，但比传统工艺下氮化物组织有所减少。

Claims (2)

1.一种渗氮钢氮化处理的冷却工艺，在零件渗氮热处理之后，零件随炉冷却至在不低于450℃温度下出炉，出炉后的零件快速放入油槽内进行油冷却。
2.根据权利要求1所述渗氮钢氮化处理的冷却工艺，其特征在于：所述零件随炉冷却温度至450℃～500℃下出炉。
CN201510996075.4A 2015-12-25 2015-12-25 一种渗氮钢氮化处理的冷却工艺 Pending CN105586564A (zh)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107217226A (zh) * 2017-05-24 2017-09-29 昆山鑫昌泰模具科技有限公司 缝纫机压脚件的渗氮加工工艺

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101994118A (zh) * 2009-08-11 2011-03-30 顾安民 一种钢件的热处理方法
CN102410225A (zh) * 2011-10-17 2012-04-11 上海西工压缩机配件有限公司 一种压缩机叶片及其制备工艺
US20130042992A1 (en) * 2010-05-11 2013-02-21 Yasushi Hiraoka Method for surface treatment of a die-casting die
CN103320743A (zh) * 2013-05-10 2013-09-25 西安航空动力股份有限公司 1Cr11Ni2W2MoV钢制零件的渗氮方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101994118A (zh) * 2009-08-11 2011-03-30 顾安民 一种钢件的热处理方法
US20130042992A1 (en) * 2010-05-11 2013-02-21 Yasushi Hiraoka Method for surface treatment of a die-casting die
CN102410225A (zh) * 2011-10-17 2012-04-11 上海西工压缩机配件有限公司 一种压缩机叶片及其制备工艺
CN103320743A (zh) * 2013-05-10 2013-09-25 西安航空动力股份有限公司 1Cr11Ni2W2MoV钢制零件的渗氮方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107217226A (zh) * 2017-05-24 2017-09-29 昆山鑫昌泰模具科技有限公司 缝纫机压脚件的渗氮加工工艺

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