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Information × Registration Number 0215U000345, 0114U000815 , R & D reports Title Improving resource of products from zirconium alloys using gradient solid soluble strengthening subsurface layers of metal popup.stage_title Head Lukyanenko Alexander, Кандидат технічних наук Registration Date 18-02-2015 Organization Karpenko Physico-Mechanical Institute of the National Academy of Science of Ukraine popup.description2 The effect of oxygen partial pressure on the size of the hardening surface layers of Zr-1% Nb zirconium alloy samples by the micro hardness test was evaluated. It is shown that the change in the oxygen partial pressure in the range studied (PO2 = 2,66 • 10-4 ... 1,33 • 10-1 Pa) changes the hardness gradient, but little effect on the size of the hardening surface layer (l = 30 .. . 40 micron). It was established experimentally that the increase of 20 ... 30% of the fatigue life of Zr-1% Nb zirconium alloy with pure bending (?a = ± 0,9%) occurs at a relative increase in the level of surface hardness K = 140 ... 150% and of diffusion layers depth 30 ... 40 micron. Is ascertained features of the destruction of Zr-1% Nb after various treatments. In particular, it is shown that after vacuum annealing (T = 580 ° C, t = 3 h, PO2 = 0,266 • 10-3 Pa) when tested by pure bending alloys destruction occurs on the mixed type: observed of small size cleave facets and small deformation ridges that surround them, and at a distance of 15 ... 30 micron from the surface there is a transition to a continuous ductile fracture. On samples with solid-solution strengthening near surface layers, which recorded an increase of fatigue life, there is a ductile character of destruction of the surface layer in the presence of a small amount of fine cleave facets and a substantial increase in the size of ridges of the deformation. Product Description popup.authors Матичак Ярослав Степанович Проскурняк Роман Васильович Труш Василь Степанович popup.nrat_date 2020-04-02 Close