Nb对20CrMo齿轮钢渗碳层深度和硬度的影响  

Effect of Nb on carburizing depth and hardness of 20CrMo gear steel

作　　者：张伟[1,2] 谌康 李慧超 王毛球 Zhang Wei;Shen Kang;Li Huichao;Wang Maoqiu(Ceneral Iron&Steel Research Institute,Beijing 100081,China;CITIC Metal Co.,Ltd.,Beijing 100004,China;Institute of Thermal Power Technology,China Datang Corparation Science and Technology Institute,Beijing 100040,China)

机构地区：[1]钢铁研究总院,北京100081 [2]中信金属股份有限公司,北京100004 [3]中国大唐集团科学技术研究院有限公司火力发电技术研究院,北京100040

出　　处：《金属热处理》2021年第10期31-34,共4页Heat Treatment of Metals

摘　　要：通过对比分析含Nb和不含Nb的20CrMo钢在不同渗碳温度(950、1000、1050和1100℃)和时间(2、4和8 h)下的渗碳层深度和显微硬度,分析Nb微合金元素对渗碳过程中碳扩散速度和最终渗碳质量的影响。结果表明:在渗碳温度≤1000℃时,相同渗碳时间条件下,添加0.032%Nb的20CrMoNb钢渗碳件的渗碳层深度与20CrMo钢基本接近,有效渗碳层的最大硬度差值在10~50 HV0.2,Nb的添加对渗碳层深度和硬度影响较小;当渗碳温度>1000℃时,添加Nb会降低有效渗碳层深度和硬度。According to comparative analysis of the depth and microhardness of the carburizing layer of 20CrMo steel containing Nb and without Nb carburized at different temperatures and carburizing time,the effect of Nb on carbon diffusion rate and final carburized layer quality was determined.The results show that the depth of carburized layer of 20CrMoNb steel with 0.032%Nb is close to that of 20CrMo steel at the same carburizing condition when the carburizing temperature is lower than 1000℃.And the maximum hardness difference of effective carburized layer is between 10 and 20 HV0.2,thus the addition of Nb has little effect on depth and hardness of the carburized layer.When the carburizing temperature is higher than 1000℃,the addition of Nb will reduce the depth and hordness of the effective carburized layer.

关 键 词：20CrMo齿轮钢 NB微合金钢 表面渗碳 

分 类 号：TG142.1[一般工业技术—材料科学与工程]