晶粒尺寸对高氮高锰奥氏体钢耐磨性的影响
Effect of grain size on wear resistance of high nitrogen high manganese austenitic steel
杨阳 1陈晨 2董旭 1廖普九 1张福成3
作者信息
- 1. 燕山大学亚稳材料制备技术与科学国家重点实验室,河北秦皇岛 066004
- 2. 燕山大学亚稳材料制备技术与科学国家重点实验室,河北秦皇岛 066004;燕山大学国家冷轧板带装备及工艺工程技术研究中心,河北秦皇岛 066004;燕山大学河北省金属产品工艺及性能优化控制重点实验室,河北秦皇岛 066004
- 3. 华北理工大学冶金与能源学院,河北唐山 063210
- 折叠
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98 μm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68～400 μm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98 μm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.
Abstract
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 98 μm,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 68-400 μm,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 98 μm.In addition,the higher wear load also leads to a mixed wear mechanism of abrasive wear and adhesive wear.
关键词
高氮高锰奥氏体钢/晶粒尺寸/力学性能/耐磨性Key words
high nitrogen high manganese austenitic steel/grain size/mechanical properties/wear resistance引用本文复制引用
基金项目
国家自然科学基金(52201143)
国家自然科学基金(52171049)
出版年
2024
NETL
NSTL
万方数据