The effect of deep cryogenic treatment on mechanical properties of 80CrMo12 5 tool steel

Authors

  • A. Rezaeian Department of Materials Engineering , Isfahan University of Technology, Isfahan, Iran
  • A. Shafyei Department of Materials Engineering , Isfahan University of Technology, Isfahan, Iran
  • K. Amini Department of Materials Engineering, Science and Research Branch, Islamic Azad University (IAU), Tehran, Iran
  • S. Nategh Department of Materials Engineering, Science and Research Branch, Islamic Azad University (IAU), Tehran, Iran
Abstract:

Cryogenic treatment can be used as a supplemental treatment that is performed on some tool steels between quenching and tempering as an effective method for decreasing retained austenite and increasing wear resistance. In this research, the effect of deep cryogenic treatment (DCT) on dimensional stability and mechanical properties of 80CrMo12 5 tool steel was investigated. The martensitic transformation start and finish temperatures were also studied using dilatometry tests. The results show that the start and finish temperatures of the martensitic transformation are 254°C and - 87°C, respectively. The hardness increases (untempered) by 3 HRC after DCT. Thus, to decrease or eliminate the amount of retained austenite, cryogenic treatment is necessary. In DCT, impact energy and hardness at all tempering temperatures decreases and increases, respectively. Tempering transformations investigation using dilatometry tests, verified that the DCT increases dimensional stability. This is attributed to the transformation of retained austenite to martensite.

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Journal title

volume 7  issue 2

pages  12- 17

publication date 2010-12-01

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