J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (5): 865-874.DOI: 10.1016/j.jmst.2018.11.006

• Orginal Article • Previous Articles     Next Articles

Differences in dry sliding wear behavior between HVAF-sprayed amorphous steel and crystalline stainless steel coatings

Hui Guoab, Suode Zhanga, Wenhai Suna, Jianqiang Wanga?()   

  1. aShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China
    bUniversity of Chinese Academy of Sciences, Beijing, 100049, China
  • Received:2018-07-17 Accepted:2018-10-24 Online:2019-05-10 Published:2019-02-20
  • Contact: Wang Jianqiang
  • About author:

    1 These authors contribute equally to this paper.

Abstract:

Dry sliding wear behavior of amorphous steel coating (ASC) and crystalline stainless steel coating (SSC) manufactured by high-velocity-air-fuel-spraying was investigated. With increasing normal load, coefficient of friction (COF) of ASC decreases slightly from 0.78 to 0.69. COF of SSC presents a minor difference under various normal loads but increases with sliding time accompanied by relatively large fluctuation. Such a difference in friction behavior between such two coatings can be understood based upon the roles of shear stress and flash temperature. Wear rate of SSC is much higher than that of ASC, suggesting better wear resistance of ASC. The enhanced wear resistance is correlated with high hardness (H), reduced Young’s modulus (Er), and ratios of H/Er and H3/Er2. Detailed analyses on worn surfaces and sub-surfaces indicate that the wear mechanisms for ASC include delamination, abrasive and oxidation wear, whereas those for SSC are delamination and oxidation.

Key words: Amorphous steel coating, Nanoindentation, Shear stress, Flash temperature, Wear mechanism