Friction induced wear and martensite deformation behavior of 20CrNi2Mo steel
YIN Cun-hong1,2，LIANG Yi-long3，4，5
（1. School of Mechanical Engineering， Guizhou University， Guiyang 550025， Guizhou， China
2. Guizhou Jiaotong College， Guiyang 550025， Guizhou， China
3. School of Materials Science and Metallurgical Engineering， Guizhou University， Guiyang 550025， Guizhou， China
4. Guizhou Key Laboratory of High Performance Metal Structure Material and Manufacture Technology， Guiyang 550025， Guizhou， China
5. National Local Co-construction Engineering Laboratory for High Performance Metal Structure Material and Manufacturing Technology， Guizhou Uniuersity， Guiyang 550025， Guizhou， China）
Abstract：The ring-disk dry sliding friction and wear testing were performed under various normal loads （100， 120 and 150 N） at 0.13 m/s by using the MMU-10 machine. The surface and subsurface microstructures were characterized by scanning electron microscopy （SEM） and electron back-scattered diffraction （EBSD）. It is highlighted that the minimum friction coefficient and maximum wear rate are under load of 150 N. Friction hot leads to serious oxidation and weld on the worn surface. The wear mechanism is a combination of abrasive wear， adhesive wear and oxidation wear. The subsurface is divided into two layers： severe plastic deformation layer （SPDL） and martensite deformation layer （MDL）. The strain from surface to subsurface is reflected from the EBSD results. The pionts of the kikuchi pattern by EBSD increase from the sample surface to the inner. The terminal regions of the deformation layers are determined accurately by EBSD and BC-depth curve.
2017, Vol. 52 
