60Si2Mn钢复合微动磨损行为的研究

STUDY ON COMPOSITE FRETTING WEAR BEHAVIORS OF 60Si2Mn STEEL

采用球／平面接触,研究了60Si2Mn钢在两种倾斜角(45°和60°)、三种载荷(Fmax=200 N、400 N、800 N)和恒定加载速度(6 mm／min)下的复合微动磨损行为。在详细分析该微动接触条件下的动力学特性的基础上,结合光学显微镜和激光共焦扫描显微镜对磨痕的分析,探讨了不同阶段的微动过程和机制。根据F-D曲线的三种形状,60Si2Mn钢的复合微动运行过程划可划分为三个阶段。第1阶段的磨损以滑移为主,第Ⅱ、Ⅲ阶段的颗粒剥落均按剥层机制进行,但损伤程度明显不同。

The composite fretting tests with GCr15/60Si2Mn ball-on-flat contact are carried out under the oblique angles of45° and 60°. The maximum imposed loads are varied from 200 N to 800 N at a constant loading speed of 6 mm/min. The kinetic behaviours of composite fretting tests are analyzed in detail in combination with microscopic examinations through optical microscopy and confocual laser scanning microscope. Corresponding to the three types of F-D curve, the kinetic processes of composite fretting might be outlined as three stages. The main feature of wear in stage Ⅰ is slip, and the main wear mechanism is particles detachment by delamination in stage Ⅱ and Ⅲ with different extent of damages.