论文部分内容阅读
采用湿喷丸处理方法在Ti-6Al-4V合金表面制备了改性层。利用X射线衍射技术、纳米压痕技术、扫描电镜以及透射电镜对合金改性层的残余应力、硬度以及显微组织随深度的变化进行研究。结果表明,改性层的残余压应力和硬度均随深度增加而减小,影响深度分别为160和80μm。通过显微组织观察发现,在80μm深度范围以内,残余压应力和硬度的增加是由细晶强化和位错强化共同主导的;在80~160μm深度范围内,残余压应力由位错强化主导。通过对硬度与屈服关系的公式进行修正,深入研究了Ti-6Al-4V合金湿喷丸处理后的强化层。
The modified layer was prepared on the surface of Ti-6Al-4V alloy by wet shot peening. The residual stress, hardness and microstructure of alloy modified layer with depth were investigated by X-ray diffraction, nanoindentation, scanning electron microscopy and transmission electron microscopy. The results show that the residual compressive stress and hardness of the modified layer decrease with the increase of depth, and the influence depth is 160 and 80 μm respectively. Through the microstructure observation, it is found that the increase of residual compressive stress and hardness is dominated by fine grain strengthening and dislocation strengthening within the depth of 80 μm. The residual compressive stress is dominated by dislocation strengthening in the depth of 80 ~ 160 μm. Through the correction of the formula of the relation between hardness and yield, the strengthening layer after wet shot peening of Ti-6Al-4V alloy was deeply studied.