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The development of a Vickers-type hardness tester for cryogenic temperatures down to 4.2 K.

Author(s) : IWABUCHI A., SHIMIZU T., YOSHINO Y., ABE T., KATAGIRI K., NITTA I., SADAMORI K.

Type of article: Article

Summary

The paper outlines the hardness tester and presents the results of hardness measurements. The hardnesses of JN1, JN2, SUS304, SUS316L, titanium alloy, and copper were measured. Hardness increased with decreasing temperature to 77 K for all metals. The hardness of steels at 77 K is more than 1.8 times higher than at 293 K, and JN2 shows the greatest increase with a factor of 3.3. However, the hardness at 4.2 K does not always increase from 77 K. SUS304 shows the greatest increase (1.4 times). On the other hand, JN2, SUS316L, copper, and copper-niobium soften between 77 and 4.2 K. Comparisons of hardness with yield stress and tensile strength are also made.

Details

  • Original title: The development of a Vickers-type hardness tester for cryogenic temperatures down to 4.2 K.
  • Record ID : 1996-3227
  • Languages: English
  • Source: Cryogenics - vol. 36 - n. 2
  • Publication date: 1996/02

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