Structure-phase Transformations in Dispersive-hardening 47CrNiMo Alloy at High Temperature Deterioration

Authors

  • Mukazhanov Y.
  • Maltekbassov M.
  • Akzholov Y.
  • Telebaev Y.

Keywords:

high-temperature heating, hardening, morphology, alloy, decay

Abstract

Revealed peculiarities of changing of the structure of CrNiMo alloy depending on temperature and aging time.It is disclosed that discontinuous decay forming lamellas ofa-phase occurs during the deterioration of 47CrNiMo alloy in 800-900°C temperature interval. At the same time there is a change of dispersion patterns, increasing betweenlamellae distance increases the thickness of the slats. At the front there are initial stages of the reaction slat coagulation discontinuous precipitation, which leads to a drop in the strength properties of the alloy.It is ascertained that change of decay mechanism in γ–phase from discontinuous to continuous occurs after rising the deterioration temperature to 1000°C.Phase particles can be observed already after 5 minutes of aging. Further aging at this temperature increase the volume fraction of precipitates. Similar processes occur in the alloy at 1100°C. Raising the temperature as well as increasing aging time leads to coagulation of the particles isolated α-phase. Changing the decay mechanism with a continuous intermittent causes slumping that the strength properties and increased ductility.

 

References

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SOLONIN M, Kondratiev V, Votinov S. Alloy CrNiMo-1 as a promising material for structural elements of nuclear and thermonuclear reactors with water coolant // PAST Series Materials and new materials. - 1995. - Issue 1 (52). -13-20 p.

Mukazhanov Y, Skakov M, Petrov V, Akhmetzhanov B. Effect of different modes of quenching on the mechanical properties of the spring Cr-Ni alloy // Bulletin of the National Academy of Sciences Republic of Kazakhstan.- â„–4. Almaty, 2006, 65-68 p.

Skakov M, Mukazhanov Y, Akhmetzhanov B. Phase-structural changes in precipitation hardening alloys after quenching 47CrNiMo // Proceedings of the National Academy of Sciences of the Republic of Kazakhstan. Chemical series - â„–2 (356). Almaty, 2006, 75-78 p.

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How to Cite

Y., M., M., M., Y., A., & Y., T. (2016). Structure-phase Transformations in Dispersive-hardening 47CrNiMo Alloy at High Temperature Deterioration. Asian Journal of Applied Sciences, 4(1). Retrieved from https://www.ajouronline.com/index.php/AJAS/article/view/3673

Issue

Vol. 4 No. 1 (2016): February 2016

Section

Articles

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