为了研究 40 Cr 钢表面纳米化对其耐磨性能的影响,对 40 Cr 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 40 Cr 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 40 Cr 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 frictional 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 40 Cr.