The Mechanism of Oxidational Wear of Some Steels

• Main Authors: YU DUNG-SHIAU, 余東曉
• Other Authors: H. So
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/00160632053666798181

碩士 === 國立臺灣大學 === 機械工程學研究所 === 89 === The Mechanism of Oxidational Wear of Some Steels Yu Dung-Shiau Abstract The Falex machine is used to perform the pin-on-disc tests. Several alloy steels were used, which included medium and high carbon steels, die steel and bearing steel. The experiment included two parts, the first part is focus on high carbon steel, SK4, and to study the wear mechanism and the growing mechanism of the oxide film. By using the four kinds of steel, the second part is to study the effect of different kinds of steel on the formation of oxides. In addition, the frictional heating controls the formation of oxides. The temperatures at the real contact surface as well as at subsurface underneath the contact surface are calculated by measuring the temperatures at two different positions on the pin and by measuring the yield stresses in compression at a wide range of temperatures. The results show that the thickness of oxide is not uniformly over the contact surfaces. The higher the load, the thicker is the oxide film. There is no evidence to prove that the oxide films spall at a critical thickness. On the other hand, they are spalled by fatigue.