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Analysis of the Sliding Wear Mechanism of Pure Iron Tested Against Different Counterparts in Various Atmospheres

상대재와 분위기에 따른 순철의 미끄럼 마멸 기구 분석

  • 구본우 (국민대학교 신소재공학부) ;
  • 권혁우 (국민대학교 신소재공학부) ;
  • 김용석 (국민대학교 신소재공학부)
  • Received : 2017.10.10
  • Accepted : 2017.10.31
  • Published : 2017.12.01

Abstract

During sling wear of a ferrous metal, a surface layer is formed. Its microstructure, constituting phases, and mechanical property are different from those of the original wearing material. Since wear occurs at the layer, it is important to characterize the layer and understand how wear rate changes with different layers. Various layers are formed depending on external wear conditions such as load, sliding speed, counterpart material, and environmental conditions. In this research, sliding wear tests of pure iron were carried out against two different counterparts (AISI 52100 bearing steel and $Al_2O_3$) in the air and in an inert Ar gas atmosphere. Pure iron was employed to exclude other effects from secondary phases in steel on the wear. Wear tests were performed at room temperature. Worn surfaces, wear debris, and cross-sections were analyzed after the test. It was found that these two different counterparts and environments produced diverse layers, resulting in significant changes in wear rate. Against the bearing steel, pure iron showed higher wear rate in an Ar atmosphere due to severe adhesion than that in the air. On the contrary, the iron showed much higher wear rate in the air against $Al_2O_3$. Different layers and wear rates were analyzed and discussed by oxidation, severe plastic deformation, and adhesion at wearing surfaces.

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