Effect of thermal cycle of welding and reheating on structural-constitutional changes of low-alloyed Cr-Ni-Mo-V steel

Autor: Yuri V. Poletaev, Valery Yu Poletaev
Jazyk: ruština
Rok vydání: 2016
Předmět:
weldability
low-alloyed steel
heat affected zone (haz)
rate of heat input
thermal welding cycle
metallographic test
coarse-grained structure of haz
grain boundary precipitation
thermal treatment
dispersion hardening
reheat cracking
свариваемость
низколегированная сталь
зона термического влияния
погонная энергия сварки
термический цикл сварки
металлографическое исследование
крупнозернистая структура зтв
выпадение фаз по границам зерен
термическая обработка
дисперсионное твердение
трещины при термической обработке
Materials of engineering and construction. Mechanics of materials
TA401-492
Zdroj: Advanced Engineering Research, Vol 16, Iss 4, Pp 96-103 (2016)
Druh dokumentu: article
ISSN: 2687-1653
DOI: 10.12737/22166
Popis: The work objective is to study the impact of the thermal welding cycle (TWC) and reheating on the metal embrittlement kinetics of the heat affected zone (HAZ) of 15H2NMFA-VRV steel joint welds. The problem of the technological strength improvement of the welded joints of the nuclear power plant equipment is solved. A comprehensive study, in which various types of analysis - fluctuation, metallographic, electron-microscopic, X-ray and chemical - are used, is carried out for this. In addition, HAZ metal simulation is used, as well as non-destructive and destructive testing of welded joints. The effect of the basic parameters of TWC and heat treatment on the embrittlement kinetics of HAZ metal is determined. It is shown that the high heat input under the electroslag welding is the main cause of the direct borders softening of the coarse grains (0-1) through allocating sulfide film forms. Further development of the dispersion hardening under reheating (softening) stimulates the relative weakening and borders destruction.
Databáze: Directory of Open Access Journals
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