摘要
为了研究40Cr钢表面纳米化对其耐磨性能的影响,对40Cr钢表面进行高能喷丸处理,获得纳米结构表层,分析了材料表面高能喷丸前后的微观组织变化,测定了纳米化材料表层的残余应力及显微硬度,研究了纳米化表层的磨损性能。结果表明:高能喷丸使40Cr钢表层发生了严重塑性变形,显微硬度较基体提高了68%,并使材料表面分布了较高幅值残余压应力,最大可达-736 MPa,残余压应力层深度达0.9 mm;高能喷丸表面纳米化能在一定程度上降低40Cr钢表面的摩擦系数,且大大减小其磨损失重,显著改善了40Cr钢的耐磨性能。
High Energy Shot Peening （HESP） was used to treat the material surface in order to study the effects of nano-crystallization surface of 40Cr on wear behavior. The nano-crystalline layer was obtained on surface. Micro-structure after HESP was analyzed, residual stress and micro-hardness after nano-crystallization were measured. Wear behaviors of nano-crystalline surface were examined as well. The experiment results show that, HESP causes severe plastic＇ deformation on surface, and the micro-hardness increases by 68 % compared to matrix. There exits compressive residual stress with large magnitude on surface, and the maximum value is -736 MPa, meanwhile, the compressive residual stress layer come up to 0.9 mm. The fric-tional wear experiments show that, HESP nano-crystallization can apparently decrease friction factor, and the wear loss is less than 1/5 of untreated samples, HESP largely improved the wear-resisting property of 40Cr.
出处
《表面技术》
EI
CAS
CSCD
北大核心
2013年第5期52-54,共3页
Surface Technology
关键词
40CR钢
高能喷丸
表面纳米化
耐磨性能
40Cr steel
HESP
surface nano-crystallization
wear-resisting property
