Paper Title:
Evaluation of the Life Limit of Standard Hardness Block HRC64 at Ambient Temperature
  Abstract

The life limit of the standard hardness block of HRC64 made from JIS-SUJ2 steel was evaluated. The HRC64 specimens were annealed at temperatures ranging from 55 to 200C for about 104 h in maximum. The micro-Vickeres hardness decreased with the annealing time at all temperatures after some incubation periods. Transmission electron microscopy (TEM) showed that the microstructure of the specimen before annealing was composed of primary cementite particles, carbide and martensite matrix. After annealing, fine cementite particles of about few tens of nanometers in size were observed. The decrease in hardness during annealing was caused by the precipitation of the cementite. The life limit keeping the standard hardness value at ambient temperature was estimated to be about 3.5-4 years based on extrapolation of the annealing curves at various temperatures.

  Info
Periodical
Solid State Phenomena (Volume 118)
Edited by
Jang Hyun Sung, Chan Gyu Lee, Yong Zoo You, Young Kook Lee and Jae Young Kim
Pages
21-26
DOI
10.4028/www.scientific.net/SSP.118.21
Citation
K. Inoue, B. Zhang, A. Yamamoto, H. Tsubakino, "Evaluation of the Life Limit of Standard Hardness Block HRC64 at Ambient Temperature ", Solid State Phenomena, Vol. 118, pp. 21-26, 2006
Online since
December 2006
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Price
$32.00
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