Open AccessMicrostructure and properties degradation of P/T 91, 92 steels weldments in creep conditions
Author(s) -
Ladislav Falat,
Viera Homolová,
Ján Kepič,
Milan Svoboda,
A. Výrostková
Publication year - 2012
Publication title -
journal of mining and metallurgy. section b, metallurgy/journal of mining and metallurgy. section b, metallurgy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.42
H-Index - 20
eISSN - 2217-7175
pISSN - 1450-5339
DOI - 10.2298/jmmb120701057f
Subject(s) - materials science , creep , metallurgy , austenite , gas tungsten arc welding , welding , intermetallic , microstructure , tungsten , laves phase , martensite , precipitation , arc welding , physics , alloy , meteorology
The studies were performed on dissimilar ferritic/austenitic weldments between 9Cr tempered martensitic steels of the grades either P/T 91 or 92 and unstabilised AISI316H austenitic steel. The welded joints were fabricated using the fusion welding by tungsten inert gas (TIG) method with Ni-based filler metal. Microstructural analyses were performed using light and electron microscopy. Microstructural gradient in heat-affected zone (HAZ) of 9Cr steels remained preserved during creep exposure. All weldments fractured by the type IV failure within their intercritical HAZ (ICHAZ) regions. The most remarkable microstructural change during creep was the precipitation of intermetallic Laves phase. Experimentally determined phases of the samples after creep exposure are in good agreement with equilibrium thermodynamic calculations