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Determining hardness at high temperatures

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Measurement Techniques Aims and scope

Conclusions

  1. 1.

    The measurement of hardness at high temperature is an approximate speedy method which in many instances may replace the more protracted toughness tests at high temperatures.

  2. 2.

    Hardness at high temperatures can be measured by means of ordinary hardness guages with attachments in the form of heating and protecting devices extension rods for fixing the tips and tips made of heat-resisting materials with a small temperature expansion coefficient. A diamond tip can be used in air with a loading of 20 kg-wt at temperatures not exceeding 700°C. Abrupt temperature variations are not permissible, since they produce cracks in the diamond.

  3. 3.

    The hardness numbers for high temperatures can be calculated from three formulas for Hht, HVd20 and HVdt. However, the values of these measurements and their errors are not comparable to each other.

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Literature cited

  1. D. Kunst “Relation between the hardness of metals and their temperature,” Metalen9, 2, 23–24, 1954.

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Authors
  1. N. P. Slavina
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  2. A. V. Smirnov
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Slavina, N.P., Smirnov, A.V. Determining hardness at high temperatures. Meas Tech 4, 275–277 (1961). https://doi.org/10.1007/BF00977346

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  • DOI: https://doi.org/10.1007/BF00977346

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