| Title |
Hydrogen influence on fracture mechanics characteristics of zirconium alloy Zr-2.5 Nb at ambient and elevated temperatures / |
| Another Title |
Vandenilio įtaka cirkonio lydinio Zr-2.5 Nb irimo charakteristikoms aplinkos ir paaukštintose temperatūrose. |
| Authors |
Daunys, M ; Dundulis, R ; Krasauskas, P |
| Full Text |
|
| Is Part of |
Mechanika.. Kaunas : Technologija. 2007, Nr. 4, p. 5-11.. ISSN 1392-1207. eISSN 2029-6983 |
| Abstract [eng] |
The main objective of the work - investigation of aging process of Ignalina NPP fuel channel tubes manufactured from zirconium alloy Zr-2,5 NB, i.e. determination of the influence of hydrogen content and temperature on fracture toughness characteristics and critical integral JIC. The main factor initiating degradation of the fuel channel materials under operating conditions is hydrogen, which forms during corrosion process and is absed in zim alloy. In zirconium alloy containing with hydro-gen form hydrides, which cause brittleness of this alloy and decrease strength to brittle fracture. Fracture toughness characteristics KQ, K*C and JIC were investigated on compact specimens (B ≈ 4 mm) without hydrogen and containing with hydrogen and containing with hydrogen (52, 100 and 140 ppm) at 20, 170, 200 and 300 °C. The investigation showed that characteristics of fracture toughness depended a little on hydrogen saturation value and more on temperature. The critical integral JIC for containing with hydrogen specimens decreases at 20ºC, however at the increase of test temperature to 300ºC also increases. Analysis of K*C and JIC dependence on mechanical characteristics of zirconium alloy has shown, that modified plasticity Zmod = (Rp0,2/Rm)Z satisfactory approximated the influence of temperature and hydrogen concentration on this characteristics variation. |
| Published |
Kaunas : Technologija |
| Type |
Journal article |
| Language |
English |
| Publication date |
2007 |
| CC license |
|
