Development of Creep Damage in Similar Weld Joints of P92 Steel Pipe

0484138 - ÚFM 2018 RIV CH eng C - Conference Paper (international conference)
Král, Petr - Sklenička, Václav - Kuchařová, Květa - Svobodová, M. - Kvapilová, Marie - Dvořák, Jiří
Development of Creep Damage in Similar Weld Joints of P92 Steel Pipe.
Contribution of Metallography to Production Problem Solutions II. Zürich: Trans Tech Publications Ltd, 2017 - (Kasl, J.), s. 162-167. Solid State Phenomena, 270. ISBN 978-3-0357-1241-4. ISSN 1662-9779.
[CCMPPS 2017 - Conference on Contribution of Metallography to Production Problem Solutions /14./. Mariánske Lázně (CZ), 06.06.2017-08.06.2017]
R&D Projects: GA ČR(CZ) GA16-09518S
Institutional support: RVO:68081723
Keywords : P92 steel * welding * creep damage * creep fracture * microstructure
OECD category: Materials engineering

The microstructure and creep behaviour of the welded joints of P92 steel pipe were
investigated in order to determine the influence of orbital heat welding technology on the creep
resistance. Creep specimens were machined from the welded joints. Tensile creep tests of welded
joints were performed at 873 K using different stresses. The microstructure of tested specimens was
investigated by scanning electron microscope Tescan equipped with an electron-back scatter
diffraction. The creep results showed that the creep fracture strain of the welded joints decreases
with decreasing value of applied stress. Microstructure investigation showed that fracture behaviour
of welded joints is influenced by an enhanced cavity formation at grain boundaries in the heataffected
zone causing lower fracture ductility.
Permanent Link: http://hdl.handle.net/11104/0279305