摘要
氮化处理对W9轴承钢意义重大,能提升其表面硬度、耐磨性与抗氧化性。系统研究不同氮化时间(4 h、5 h、6 h、7 h、8 h)对W9轴承钢摩擦学行为、微观组织演变的影响。借助SEM-EDS分析表面形貌、磨损轨迹及元素分布,开展显微硬度测试与摩擦磨损实验,评估力学与摩擦学性能。结果显示:氮化时间对氮化层的形成与稳定性影响显著;7 h氮化样品性能最佳,硬度(HV)达950,摩擦系数低至0.53,磨损率低至1.2×10^(-6)mm^(3)/(N·m),x(O)低至1.6%,x(N)高至7.8%,这表明7 h氮化工艺能形成均匀致密、性能良好的氮化层,显著提升材料耐磨性与氧化稳定性;4 h、5 h氮化会使氮化层发育不足,耐磨性差;8 h氮化虽可增加层厚,但会产生过多脆性与过高氧化敏感性。经整体分析,7 h氮化是提升W9轴承钢耐磨性、降低摩擦、实现优异表面稳定性的最佳工艺,有望用于高性能摩擦学领域。
Nitriding treatment is of great significance for W9 bearing steel,as it can improve its surface hardness,wear resistance,and oxidation resistance.Systematically investigate the effects of different nitriding times(4 h,5 h,6 h,7 h,8 h)on the tribological behavior and microstructural evolution of W9 bearing steel.Using SEM-EDS to analyze surface morphology,wear trajectory,and element distribution,conduct microhardness testing and friction and wear experiments to evaluate mechanical and tribological properties.The results show that the nitriding time has a significant impact on the formation and stability of the nitride layer.The performance of the 7-hour nitrided sample is the best,with a hardness(HV)of 950,a friction coefficient as low as 0.53,a wear rate as low as 1.2×10^(-6) mm^(3)/(N·m),x(O)as low as 1.6%,and x(N)as high as 7.8%.This indicates that the 7-hour nitridation process can form a uniform,dense,and high-performance nitride layer,significantly improving the material's wear resistance and oxidation stability.Nitriding for 4 hours and 5 hours will result in insufficient development of the nitride layer and poor wear resistance.Although 8-hour nitridation can increase layer thickness,it will result in excessive brittleness and oxidation sensitivity.After overall analysis,7-hour nitriding is the best process to improve the wear resistance,reduce friction,and achieve excellent surface stability of W9 bearing steel,and is expected to be used in the field of high-performance tribology.
作者
赵有春
Zhao Youchun(Lanzhou Vocational Technical College,Lanzhou Gansu 730070,China)
出处
《山西冶金》
2025年第7期4-8,共5页
Shanxi Metallurgy
基金
2024年兰州职业技术学院课题“轴承钢表面渗氮处理的摩擦学性能研究”(2024XY-19)。
关键词
W9轴承钢
硬度
摩擦磨损
抗氧化性
W9 bearing steel
hardness
friction and wear
oxidation resistance
