摘要
针对常规渗碳过程中存在周期长、变形大、渗层组织不理想的问题,采用稀土高浓度渗碳法对20Cr2Ni4A齿轮钢进行渗碳处理,并对其渗碳后的显微组织、硬度梯度、碳浓度梯度及变形情况等进行了研究。结果表明:与常规渗碳相比,当渗碳层深为2.0 mm±0.2 mm时,稀土渗碳可提升效率20%以上;稀土渗碳可细化组织,也可使渗层获得较为平缓的硬度梯度和碳浓度梯度分布;热后变形满足齿轮加工技术要求。稀土渗碳可用于承受复杂应力服役条件下的重载齿轮表面强化工艺。
To solve the problems of long production cycle, large deformation, and unsatisfied microstructure in the conventional carburized process, 20Cr2Ni4A gear steel was treated by the carburized process with high concentration of rare earth. The microstructure, hardness gradient, carbon concentration gradient and deformation of the carburized parts were studied in this paper. The results show that when the case-hardened depth is 2.0 mm±0.2 mm, the efficiency of the carburized process with high concentration of rare earth can be increased by more than 20%, compared with the conventional carburized process; the rare earth can facilitate to refine the microstructure of the carburized case, and a gentle distribution of hardness gradient and carbon concentration gradient can be achieved in the carburized case. The deformation of the gears after the carburized process meets the technological requirements of their subsequent machining. The rare earth carburized process can be used as the surface strengthening process of the heavy-duty gears which work under the condition of complex stress.
作者
赵文军
刘国强
蔡红
刘锐
陈诚
郭毅
武玉平
于庆峰
ZHAO Wen-jun;LIU Guo-qiang;CAI Hong;LIU Rui;CHEN Cheng;GUO Yi;WU Yu-pingl;YU Qing-feng(Inner Mongolia First Machinery Group Co.,Ltd.,Norinco Group,Baotou 014030,Inner Mongolia,China;School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China;Test and Measuring Academy,Norinco Group,Huayin 714200,Shaanxi,China)
出处
《铸造》
CAS
CSCD
北大核心
2018年第9期831-835,共5页
Foundry
关键词
20Cr2Ni4A齿轮钢
稀土渗碳
显微组织
硬度梯度
碳浓度梯度
20Cr2Ni4A gear steel
rare earth carburized process
microstructure
micro-hardness gradient
carbon concentration gradient
