渗碳轴承钢G20CrNi2MoA的硫氮碳共渗工艺
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摘要
以渗碳轴承钢G20Cr Ni2Mo A为研究对象,在570、580、600℃温度下对其退火态试样进行硫氮碳共渗,并进行淬火和低温回火处理,通过扫描电镜对其渗层及心部组织进行分析,并用显微硬度计对渗层进行了硬度分析。结果表明:580℃共渗后组织均匀细密、心部硬度较高;与一次淬火+低温回火相比,二次淬火+低温回火得到的晶粒尺寸更为细小,得到的渗层组织分布更为均匀且致密,表层为硫氮碳化合物,心部组织为回火马氏体。硫化物的存在可起到减小摩擦和具有一定自润滑的作用,增加轴承抗磨损能力,提高轴承寿命。
G20CrNi2MoA carburizing bearing steel annealed samples were sulphonitrocarburized at 570,580 and 600 ℃,respectively. And twice quenching and low temperature tempering were conducted. Microstructure of the modified layer and core in the G20CrNi2MoA steel are observed by means of scanning electron microscope. The hardness of the layer for the steel is measured by a microhardness tester. The results show that the steel can attain higher hardness in core with uniform microstructure after 580 ℃ sulphonitrocarburizing heat treatment. The grain size of the steel by twice quenching and low temperature tempering is finer than that of once quench and low temperature temper. After twice quenching and low temperature tempering treatment,sulfur nitrogen carbon compounds in the surface,and tempered martensite in the core is attained and the distribution of structures for the layer is uniform. The presence of sulfide can reduce friction and have a selflubrication effect,which can improve the wear resistance and prolong the life of bearing.
G20CrNi2MoA carburizing bearing steel annealed samples were sulphonitrocarburized at 570,580 and 600 ℃,respectively. And twice quenching and low temperature tempering were conducted. Microstructure of the modified layer and core in the G20CrNi2MoA steel are observed by means of scanning electron microscope. The hardness of the layer for the steel is measured by a microhardness tester. The results show that the steel can attain higher hardness in core with uniform microstructure after 580 ℃ sulphonitrocarburizing heat treatment. The grain size of the steel by twice quenching and low temperature tempering is finer than that of once quench and low temperature temper. After twice quenching and low temperature tempering treatment,sulfur nitrogen carbon compounds in the surface,and tempered martensite in the core is attained and the distribution of structures for the layer is uniform. The presence of sulfide can reduce friction and have a selflubrication effect,which can improve the wear resistance and prolong the life of bearing.
引文
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[3]米振莉,张小垒,李志超,等.热处理工艺对高碳铬轴承钢组织和性能的影响[J].材料热处理学报,2015,36(7):119-120.Mi Zhenli,Zhang Xiaolei,Li Zhichao,et al.Effect of heat treatment process on microstructure and properties of a high carbon chromium bearing steel[J].Transactions of Materials and Heat Treatment,2015,36(7):119-120.
[4]Bhattacharyya A,Subhash G,Arakere N.Evolution of subsurface plastic zone due to rolling contact fatigue of M-50 Ni L case hardened bearing steel[J].International Journal of Fatigue,2014,59:102-113.
[5]张增岐,刘耀中,樊志强.贝氏体等温淬火及其在轴承上的应用[J].金属热处理,2002,23(1):57-60.Zhang Zengqi,Liu Yaozhong,Fan Zhiqiang.Bainite isothermal quenching and its application in bearing[J].Heat Treatment of Metals,2002,23(1):57-60.
[6]Mehtedi M E,Gabrielli F,Spigarelli S.Hot workability in process modeling of a bearing steel by using combined constitutive equations and dynamic material model[J].Materials and Design,2014,53:398-404.
[7]祝溪明.滚动轴承材料热处理及其新技术应用研究[J].机械设计与制造,2012,12:220-221.Zhu Ximing.Study of rolling materials heat treatment and new technology's application[J].Machinery Design and Manufacture,2012,12:220-221.
[8]孔祥华,刘建尊,刘在龙,等.高温变形处理对GCr15轴承钢液析碳化物的影响[J].材料热处理学报,2014,35(7):173-176.Kong Xianghua,Liu Jianzun,Liu Zailong,et al.Effect of high temperature deformation on liquation carbide of GCr15 bearing steel[J].Transactions of Materials and Heat Treatment,2014,35(7):173-176.
[9]张翔,张俊.不锈钢加铁稀土离子硫氮碳共渗工艺的研究[J].表面技术,2004,33(2):40-43.Zhang Xiang,Zhang Jun.Study on technology of the rare-earth ionic carbon-sulfonitriding with iron for stainless steel[J].Surface Technology,2004,33(2):40-43.
[10]王之香.微合金化对大规格Q345E锻材组织及性能的影响[J].金属热处理,2012,37(12):97-99.Wang Zhixiang.Influence of microalloying on microstructure and mechanical properties of large size Q345E forging material[J].Heat Treatment of Metals,2012,37(12):97-99.
[11]王洪钢.GCr15轴承钢的接触疲劳寿命影响因素[J].黑龙江冶金,2009,29(4):1-3.Wang Honggang.Research on effect of bearing steel contact fatigue life[J].Heilongjiang Metallurgy,2009,29(4):1-3.
[12]李中友.G20Cr Ni2Mo A渗碳轴承钢生产工艺的探讨[J].特钢技术,2010,16(3):10-14.Li Zhongyou.A study on production process of G20Cr Ni2Mo A carburizing bearing steel[J].Special Steel Technology,2010,16(3):10-14.