316L不锈钢微动磨蚀过程力学化学交互作用的迁移行为

用球-平面接触微动设备研究了316L不锈钢微动损伤速率随微动时间的变化，解析了316L不锈钢不同微动阶段的损伤机制.316L不锈钢微动分三个阶段第一阶段为微突体接触机制，犁沟损伤严重；第二阶段缝隙腐蚀的发生发展成为影响微动的主导因素；第三阶段是腐蚀疲劳微断裂所致剥层机制为主的损伤过程.力学化学交互作用分量在稳定阶段占损伤的60％以上，对316L不锈钢微动损伤影响显著；力学分量随微动过程的进行线性下降，腐蚀分量线性增长，但力学因素是材料微动损伤的主要因素.

FRETTING CORROSION-WEAR TRANSFERABILITY OF 316L STAINLESS STEEL

A sphere plane contact device has been used to study the fretting corrosion wear transferability of 316L stainless steel in saline solution. The evolution of fretting damage rates such as the total weight loss rate ( K Tt ), mechanical damage rate ( K mt ), corrosion rate ( K ct ) and the damage induced by the synergistic effect between mechanical and chemical actions as a function of fretting cycle has been investigated. In the same time, the variation of the components of mechanical action, corrosion action and the synergistic effect in the total weight loss rate have also been studied. The variations of K Tt , K mt , K ct were equal to each other. In spite of the difference between the variation of K ct and the variations of K Tt , K mt , K ct ,the fretting of 316L stainless steel was characteristic of three stages. And each of these three stages was of the different mechanism. In the beginning of fretting the damage occurred in local areas, and the material suffered ploughing damage because of the hard debris formed by fabrication of passive film. In the second period, serious crevice corrosion occurred nearby the fretted region, which has taken a great important role in the fretting process. And in the final period, the damage mechanism could be defined as corrosive flaking process. The results showed there was a relationship between the of damage rates and mechanisms. The synergistic effect took an important role in fretting, and in stable stage, more than 60 percent of fretting damage was due to the conjoint action of mechanical and chemical effects. The result finds the inter relationship between the transitions of fretting damage rates and the synergistic effect and the variation of damage mechanisms in different fretting periods.