Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Analysis on the Results of the World Wide Rockwell Hardness Round Robin Test with Conical Indenters

로크웰 경도 국제비교교정 결과 분석

  • Bahng, G.W. (Div. of Chemical Metrology and Materials Evaluation, Korea Research Institute of Standards and Science) ;
  • Tak, N.H. (Div. of Chemical Metrology and Materials Evaluation, Korea Research Institute of Standards and Science) ;
  • Polzin, T. (Materialprufungsamt Nordrhein-Westfalen (MPA-NRW))
  • 방건웅 (한국표준과학연구원 물질량표준부) ;
  • 탁내형 (한국표준과학연구원 물질량표준부) ;
  • Received : 2001.06.14
  • Published : 2001.11.30
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Abstract

For the establishment of the world wide unified scales of the Rockwell hardness test with conical indenters, round robin test was carried from 1998 to 2000. The pilot laboratory was MPA-NRW and 12 laboratories from 11 countries participated In this RRT. Rockwell hardness of 74 specially prepared blocks was measured for the scales of C, A, D, 45N, 30N, and 15N and the results were compared. It was found that the geometric form of indenter affects on the results very significantly and standardization in the measurement and evaluation of indenter should be established in short time for the reliable hardness measurement. KRISS showed good results in general for all of the ranges except 15N scale which showed relatively large difference compare to the mean value. It was concluded that poor control in loading velocity of the dash pot was the major reason.

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