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Abstract

The main objective of the project has been to make a detailed analysis of the fatigue behaviour of A515 G70 steel as used in thick plate pressure vessels (thermal power stations) at room and at high temperatures. A515 steel thick plate structural heterogeneities and influence of welding have been analysed. The level of prestraining in the plate material as defined by different curvatures of the shell, specimen orientation, microstructure and differences between base material, heat affected zone and weld metal have been considered. Fatigue behaviour has been analyzed for three different temperatures taking into account low amplitude fatigue concepts (fatigue threshold and Paris equation) and low cycle fatigue (cycle curve, Basquin and Coffin-Manson equations). The study has been completed with a fractographic analysis of tested specimens. Results show that specimen location and notch orientation do not have influence on fatigue crack propagation. Microstructure variation has not any influence on fatigue behaviour for the base material and the HAZ. On the contrary, on weldmetal particle presence (inclusions and carbides) helps the nucleation of static voids that contribute to crack propagation at room temperature.

Additional information

Authors: FUENTES PEREZ M, Centro de Estudios e Investigaciones Tecnicas de Guipuzcoa, San Sebastian (ES);RODRIGUEZ IBABE J, Centro de Estudios e Investigaciones Tecnicas de Guipuzcoa, San Sebastian (ES);LINAZA ABERASTURI M, Centro de Estudios e Investigaciones Tecnicas de Guipuzcoa, San Sebastian (ES)
Bibliographic Reference: EUR 15505 ES (1995) 134pp., FS, ECU 15
Availability: Available from the (2)
ISBN: ISBN 92-827-5637-8
Record Number: 199610002 / Last updated on: 1996-03-18
Category: PUBLICATION
Original language: es,en
Available languages: es,en
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