Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
권호 표지

Effects of Carbon, Tungsten, and Vanadium on the Microstructure, High-Temperature Wear Properties, and Surface Roughness of High Speed Steel Rolls

고속도강롤의 미세조직, 고온마모특성, 표면조도에 미치는 탄소, 텅스텐, 바나듐의 영향

  • Ha, Dae Jin (Center for Advanced Aerospace Materials, Pohang University of Science and Technology) ;
  • Sung, Hyo Kyung (Center for Advanced Aerospace Materials, Pohang University of Science and Technology) ;
  • Park, Joon Wook (Roll Production Dept. Hyundai Steel Co.) ;
  • Lee, Sunghak (Center for Advanced Aerospace Materials, Pohang University of Science and Technology)
  • 하대진 (포항공과대학교 항공재료연구센터) ;
  • 성효경 (포항공과대학교 항공재료연구센터) ;
  • 박준욱 (현대제철 롤제조부) ;
  • 이성학 (포항공과대학교 항공재료연구센터)
  • Received : 2009.04.24
  • Published : 2009.07.25
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Abstract

A study was conducted on the effects of carbon, tungsten, and vanadium on the wear properties and surface roughness of four High Speed Steel (HSS) rolls manufactured by the centrifugal casting method. Hot-rolling simulation tests were carried out using a high-temperature wear tester capable of controlling speed, load, and temperature. HSS rolls contained a large amount (up to 25 vol.%) of carbides such as MC, $M_{2}C$, $M_{7}C_{3}$, and $M_{6}C$ carbides formed in the tempered martensite matrix. The matrix consisted mainly of lath tempered martensite when the carbon content in the matrix was small, and contained a considerable amount of plate tempered martensite when the carbon content increased. The high-temperature wear test results indicated that the wear properties and surface roughness of the rolls improved when the amount of hard MC carbides formed inside solidification cells increased. The rolls distribution was also homogeneous. The best wear properties and surface roughness were obtained from a roll where a large amount of MC carbides was homogeneously distributed in the lath tempered martensite matrix. The proper contents of carbon equivalent, tungsten equivalent, and vanadium were 2.0~2.3%, 9~10%, and 5~6%, respectively.

Keywords

Acknowledgement

Supported by : 한국과학재단

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