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Combination of Experiments and Continuum Damage Mechanics Approach for Prediction of Creep Fracture in an Advanced 9%Cr Steel
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SYSNO ASEP 0470524 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Combination of Experiments and Continuum Damage Mechanics Approach for Prediction of Creep Fracture in an Advanced 9%Cr Steel Author(s) Sklenička, Václav (UFM-A) RID, ORCID
Kuchařová, Květa (UFM-A) RID, ORCID
Kvapilová, Marie (UFM-A) RID, ORCID
Král, Petr (UFM-A) RID, ORCID
Dvořák, Jiří (UFM-A) RID, ORCIDNumber of authors 5 Source Title Materials Structure & Micromechanics of Fracture VIII. - Zürrich : Trans Tech Publications, 2017 / Šandera P. - ISSN 1662-9779 - ISBN 978-3-03835-626-4 Pages s. 591-594 Number of pages 4 s. Publication form Print - P Action MSMF8. International Conference on Materials Structure and Micromechanics of Fracture /8./ Event date 27.06.2016 - 29.06.2016 VEvent location Brno Country CZ - Czech Republic Event type WRD Language eng - English Country CH - Switzerland Keywords steel P92 ; high-temperature fracture ; creep fracture mode ; creep cavitation ; creep damage tolerance factor Subject RIV JG - Metallurgy OECD category Materials engineering R&D Projects GA16-09518S GA ČR - Czech Science Foundation (CSF) Institutional support UFM-A - RVO:68081723 EID SCOPUS 85009814146 DOI 10.4028/www.scientific.net/SSP.258.591 Annotation As candidate materials for high-temperature components, most attention has been paid to improving tempered martensitic creep-resistant 9-12%Cr steels. In this work, creep damage and fracture behaviour of an advanced W-modified P92 steel (ASTM Grade P92) was investigated at 600 and 650°C. Tensile creep tests were followed by fractographic analysis of crept and broken specimens. Besides experimental investigations, the creep damage tolerance parameter lambda has been used to assess the creep fracture mode. In accordance with experiments the values of lambda indicate variety in the fracture mode and provide some evidence on accelerated degradation of the creep strength. The SEM investigations of creep fracture surface revealed substantial changes in microfractographic features of creep fracture. At high applied stress level, the fracture was frequently transgranular due to local loss of a stability of plastic deformation. The fracture ductility drops with decreasing applied stress, demonstrating ductile dimple (transgranular) to brittle (intergranular cavitation) transition of the fracture mode. It was suggested that both the creep deformation and fracture processes are controlled by the same processes and the rate controlling mechanism is most probably climb of intergranular mobile dislocations. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2018
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