摘要
对高氮高锰奥氏体钢60Mn18Cr7N进行干滑动摩擦磨损试验,通过场发射扫描电镜、透射电镜、电子背散射衍射技术等分析手段,对比了不同晶粒尺寸下高氮高锰奥氏体钢的微观组织、耐磨性以及磨损机制。结果表明,随着晶粒尺寸的减小,试样的屈服强度升高,冲击性能降低,耐磨性却先增加后减小。晶粒尺寸约为98μm的试样屈服强度为486 MPa,冲击吸收能量为236 J,在1000 N摩擦载荷下作用120 min后质量损失最小,约为43 mg,磨损表面硬度高达693 HV0.2。而在68~400μm晶粒尺寸范围内,细晶有利于提高屈服强度、加工硬化与抵抗表面塑变切削能力,而粗晶提升韧性有利于抑制材料磨损中裂纹的萌生与扩展,两者的综合作用是晶粒尺寸约为98μm试样获得最优耐磨性的主要原因。此外,较高的磨损载荷也导致高氮高锰奥氏体钢的磨损机理以磨粒磨损和黏着磨损混合磨损机制为主。
Dry sliding friction and wear test was carried out for high nitrogen high manganese austenitic steel 60Mn18Cr7N.The microstructure,wear resistance and wear mechanism of the tested steel with different grain sizes were comparatively studied by means of scanning electron microscope,transmission electron microscope and electron backscattered diffraction.The results show that with the decrease of grain size,the yield strength increases,the impact toughness decreases,but the wear resistance increases first and then decreases.For the specimen with grain size of about 98μm,the yield strength and impact absorbed energy are respectively 486 MPa and 236 J,the mass loss is the lowest as about 43 mg under 1000 N wear load for 120 min,and the surface hardness is 693 HV0.2.In the grain size range of 68⁃400μm,the fine grains are beneficial for improving the yield strength,work hardening and resistance to surface plastic cutting ability,while the coarse grains enhance toughness and help suppress the initiation and propagation of cracks in the wear process.The combined action of these two factors is the main reason for the optimum wear resistance of the specimen with grain size about 98μm.In addition,the higher wear load also leads to a mixed wear mechanism of abrasive wear and adhesive wear.
作者
杨阳
陈晨
董旭
廖普九
张福成
Yang Yang;Chen Chen;Dong Xu;Liao Pujiu;Zhang Fucheng(State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao Hebei 066004,China;National Engineering Research Center for Equipment and Technology of Cold Strip Rolling,Yanshan University,Qinhuangdao Hebei 066004,China;Hebei Key Laboratory for Optimizing Metal Product Technology and Performance,Yanshan University,Qinhuangdao Hebei 066004,China;College of Metallurgy and Energy,North China University of Science and Technology,Tangshan Hebei 063210,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2024年第6期169-176,共8页
Heat Treatment of Metals
基金
国家自然科学基金(52201143,52171049)。
关键词
高氮高锰奥氏体钢
晶粒尺寸
力学性能
耐磨性
high nitrogen high manganese austenitic steel
grain size
mechanical properties
wear resistanc
