Issues »  Volume 41, Issue 2

Influence of Heat Treatment in Gas Mediums on Mechanical Properties of Samples of Zr–1%Nb Alloy

V. S. Trush$^{1}$, O. H. Lukyanenko$^{1}$, V. M. Voyevodin$^{2}$, P. I. Stoyev$^{2}$

$^{1}$G. V. Karpenko Physico-Mechanical Institute, NAS of Ukraine, 5 Naukova Str., UA-79060 Lviv, Ukraine
$^{2}$National Science Center ‘Kharkiv Institute of Physics and Technology’, NAS of Ukraine, 1 Akademichna Str., UA-61108 Kharkiv, Ukraine

Received: 20.06.2018. Download: PDF

The effect of heat treatment in a gas medium at $T$ = 580°C during $\tau$ = 3 h with residual pressure $P$ = 1.33$\cdot10^{-3}$ Pa and in an oxygen-rich gas medium ($T$ = 580°C, $\tau$ = 0.5 h, $P$ = 1.33 Pa + $T$ = 580°C, $\tau$ = 2.5 h, $P$ = 1.33$\cdot10^{-2}$ Pa) on mechanical properties of a Zr–1%Nb alloy is studied experimentally. As shown, depending on the degree of rarefaction of the technological gas medium, a near-surface layer with a certain hardness gradient is formed. As experimentally revealed, the heat treatment of Zr–1%Nb alloy samples in an oxygen-rich gas medium has positive effects on their fatigue life capability at tests by means of pure bending and cyclic stretching. The features of fracture of Zr–1%Nb alloy samples depending on the treatment mode are given.

Key words: zirconium alloy, oxygen-rich gas medium, chemicothermal treatment, near-surface layer, microhardness, fatigue life.

URL: http://mfint.imp.kiev.ua/en/abstract/v41/i02/0227.html

DOI: https://doi.org/10.15407/mfint.41.02.0227

PACS: 46.50.+a, 62.20.me, 62.20.Qp, 68.47.Gh, 81.40.Np, 81.65.Mq, 81.70.Bt

Citation: V. S. Trush, O. H. Lukyanenko, V. M. Voyevodin, and P. I. Stoyev, Influence of Heat Treatment in Gas Mediums on Mechanical Properties of Samples of Zr–1%Nb Alloy, Metallofiz. Noveishie Tekhnol., 41, No. 2: 227—240 (2019) (in Ukrainian)

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