Fretting wear and friction oxidation behavior of
0Cr20Ni32AlTi alloy at high temperature
0Cr20Ni32AlTi alloy at high temperature
(1. State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China;
2. Institute of Chemical Materials, Chinese Academy of Engineering and Physics, Mianyang 621900, China)
2. Institute of Chemical Materials, Chinese Academy of Engineering and Physics, Mianyang 621900, China)
Abstract: The fretting wear behavior of 0Cr20Ni32AlTi alloy was investigated with crossed cylinder contact under 80 N at 300 and 400 °C. Wear scar and debris were analyzed systematically by scanning electron microscopy and X-ray photoelectron spectroscopy. The results show that the friction logs are mixed fretting regime and gross slip regime with the magnitudes of displacement of 10 and 20 μm, respectively. Severe wear and friction oxidation occur on the material surface. A large number of granular debris produced in the fretting process can be easily congregated and adhered at the contact zone after repeated crushes. The resultant of friction oxidation is mainly composed of Fe3O4, Fe2O3, Cr2O3 and NiO. Temperature and friction are the major factors affecting the oxidation reaction rate. The fretting friction effect can enhance the oxidation reaction activity of surface atoms of 0Cr20Ni32AlTi alloy and reduce the oxidation activation energy. As result, the oxidation reaction rate is accelerated.
Key words: high temperature; nickel chrome-iron alloy; fretting wear; friction oxidation; activation energy