Evaluation of the Life Limit of Standard Hardness Block HRC64 at Ambient Temperature

Katsuhiko Inoue; Bin Zhang; Atsushi Yamamoto; Harushige Tsubakino

doi:10.4028/www.scientific.net/SSP.118.21

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HomeSolid State PhenomenaSolid State Phenomena Vol. 118Evaluation of the Life Limit of Standard Hardness...

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.

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Periodical:

Solid State Phenomena (Volume 118)

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21-26

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.118.21

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Online since:

December 2006

Authors:

Katsuhiko Inoue, Bin Zhang, Atsushi Yamamoto, Harushige Tsubakino

Keywords:

Annealing Treatment, Cementite, Life Limit, Standard Hardness Block, TEM

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