渗碳齿轮内氧化控制技术研究
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摘要
针对齿轮在渗碳过程中容易产生较深的内氧化这一现象,提出通过调节碳势的手段抑制内氧化的产生,探讨了18CrNiMo7-6材料的渗碳齿轮内氧化控制技术。采用控制变量法改变扩散区的碳势,调节试样在渗碳过程中碳势的变化,分析试样的金相显微组织,比较内氧化层深度。试验结果表明:扩散期碳势从0.7%C上升到0.8%C时,内氧化深度从22μm下降到15μm。由此可见碳势是影响内氧化深度的一个重要因素,可适当提高扩散期碳势,抑制内氧化产生。随着碳势的增加,硬化层层深有所提高,碳化物也随之增加。
In order to relief the phenomenon that gear is easy to produce deep internal oxidation in the carburizing process,we adjusted the carbon potential to control the internal oxidation,and discussed the internal oxidation technology about 18CrNiMo7-6 carburized gear.In actual production process,by changing the carbon potential at diffusion zone of three groups of carburized specimens,the carburizing trend of specimens in the furnace was controlled,the microstructures of samples were analyzed,and the depths of internal oxidation layers of samples were compared.The test results show the carbon potential increases from 0.7%C to 0.8%C,and the depth of internal oxidation will decrease from 22μm to 15μm.Thus the carbon potential is one of the important factors which influence the oxidation depth.It is appropriate to increase the carbon potential at diffusion zone to reduce the internal oxidation.
In order to relief the phenomenon that gear is easy to produce deep internal oxidation in the carburizing process,we adjusted the carbon potential to control the internal oxidation,and discussed the internal oxidation technology about 18CrNiMo7-6 carburized gear.In actual production process,by changing the carbon potential at diffusion zone of three groups of carburized specimens,the carburizing trend of specimens in the furnace was controlled,the microstructures of samples were analyzed,and the depths of internal oxidation layers of samples were compared.The test results show the carbon potential increases from 0.7%C to 0.8%C,and the depth of internal oxidation will decrease from 22μm to 15μm.Thus the carbon potential is one of the important factors which influence the oxidation depth.It is appropriate to increase the carbon potential at diffusion zone to reduce the internal oxidation.
引文
[1]An X,Cawley J,Rainforth W M,et al.A study of internal oxidation in carburized steels by glow discharge optical emission spectroscopy and scanning electron microscopy[J].Spectrochimica Acta Part B:Atomic Spectroscopy,2003,58(4):689-698.
[2]杨志.渗碳部件内氧化行为及其失效分析[D].大连:大连海事大学,2012:1-24.
[3]王有铭,王海凤,王永杰.17Cr2Ni2MoA大齿轮渗碳中发生内氧化原因和预防[J].机械工程师,2010(4):124-125.
[4]潘一凡,赵茂程.碳氯共渗渗层黑色组织的形成机理和预防[J].机械制造与研究,2002(5):7-8.
[5]张根元,蔡益新,李春兴.渗碳或碳氮共渗时内氧化的热力学分析[J].金属热处理,2001(5):27-29,39.
[6]赵振东.低压真空渗碳气淬技术的应用[J].国外金属热处理,2005,26(3):33-34.
[2]杨志.渗碳部件内氧化行为及其失效分析[D].大连:大连海事大学,2012:1-24.
[3]王有铭,王海凤,王永杰.17Cr2Ni2MoA大齿轮渗碳中发生内氧化原因和预防[J].机械工程师,2010(4):124-125.
[4]潘一凡,赵茂程.碳氯共渗渗层黑色组织的形成机理和预防[J].机械制造与研究,2002(5):7-8.
[5]张根元,蔡益新,李春兴.渗碳或碳氮共渗时内氧化的热力学分析[J].金属热处理,2001(5):27-29,39.
[6]赵振东.低压真空渗碳气淬技术的应用[J].国外金属热处理,2005,26(3):33-34.