Issues »  Volume 41, Issue 12

Structural-Phase State of Surface Layers of Cu–39Zn–1Pb Brass After High-Frequency Impact Treatment in Liquid Nitrogen

M. O. Vasylyev$^{1}$, B. M. Mordyuk$^{1}$, S. M. Voloshko$^{2}$, A. P. Burmak$^{2}$, D. V. Pefti$^{2}$

$^{1}$G. V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, 36 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine
$^{2}$National Technical University of Ukraine ‘Igor Sikorsky Kyiv Polytechnic Institute’, 37 Peremohy Ave., UA-03056 Kyiv, Ukraine

Received: 08.08.2019. Download: PDF

The structural-phase state and the $HV$ microhardness of the surface layer of two-phase Cu–39Zn–1Pb brass after various regimes of high-frequency impact treatment (UIT) in liquid nitrogen were studied. As shown, the change in the mechanical properties and the structural-phase state of the surface layer with increasing processing time has a two-stage character. The first stage of rapid hardening ($\sim$2 times) during $\sim$20 s supported by structural-phase rearrangements changes by the saturation stage of the appropriate characteristics. The main factors of hardening are the accumulation of dislocations in plane pile-ups, the formation of microtwins and shear bands with a high density of dislocations in them, which ensure the refinement of the grain structure and decrease the size of the coherent scattering areas by more than 10 times. The detected changes in the phase and chemical composition, as well as the formation of compression stresses and the grains’ reorientation, provide additional hardening of the surface layer after cryo-UIT.

Key words: brass, high-frequency impact processing, cryo-deformation, liquid nitrogen, structural-phase state, nanostructure, microhardness.

URL: http://mfint.imp.kiev.ua/en/abstract/v41/i12/1611.html

DOI: https://doi.org/10.15407/mfint.41.12.1611

PACS: 43.35.+d, 61.72.Ff, 81.40.Np, 81.65.-b, 83.10.Tv

Citation: M. O. Vasylyev, B. M. Mordyuk, S. M. Voloshko, A. P. Burmak, and D. V. Pefti, Structural-Phase State of Surface Layers of Cu–39Zn–1Pb Brass After High-Frequency Impact Treatment in Liquid Nitrogen, Metallofiz. Noveishie Tekhnol., 41, No. 12: 1611—1629 (2019) (in Ukrainian)

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