Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Effects of Galvannealing Temperatures on Iron-Zn Intermetallic Compounds and Friction Characteristic of Galvannealed Coatings

갈바어닐링온도변화가 합금화용융아연코팅의 합금상과 마찰특성에 미치는 영향

  • 이정민 (한국국제대 자동차공학부) ;
  • 김동환 (한국국제대 자동차공학부) ;
  • 이선봉 (계명대학교 자동차공학부) ;
  • 김동진 (포스코 자동차강재연구가공센터) ;
  • 김병민 (부산대학교 기계공학부)
  • Published : 2008.12.01
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Abstract

This paper is aimed to understand the effect of different galvannealing temperatures on the frictional properties and Fe-Zn intermetallic phases of the galvannealed (GA) coatings on steel sheets. Their galvannealing treatments were conducted at 465, 505, 515 and $540^{\circ}C$ for about 10s in the additional heating furnace of an industrial continuous hot-dip galvanizing line. The mechanical and the frictional properties of the coatings were estimated using nanoindentation, nanoscratch, micro vickers hardness tests and flat friction tests, which were performed at contact pressures of 4, 20 and 80MPa. Also, the correlation between the microstructure and the frictional properties of the GA coatings were investigated by SEM observation for the cross-section of the GA coating after and before flat friction tests. The results showed that the mechanical and the frictional properties of the coatings are strongly dependent on their phase distributions and microstructure. Especially, in low contact pressure of 4MPa the frictional properties of the coatings were dependent on the surface phases and morphology, while in high contact pressure of 80MPa it was influenced by their mechanical properties based on the dominant phase distributions.

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References

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