Microstructural characterisation of creep tested 9CR welds for MarBN steel
conference contribution
posted on 2016-09-19, 15:12 authored by Juntao Guo, Mark JepsonMark Jepson, Rachel ThomsonRachel ThomsonCreep properties of 9Cr heat resistant steels can be improved by the addition of boron and nitrogen to produce martensitic boron-nitrogen strengthened steels (MarBN). The joining of this material is a crucial consideration in the material design since welds can introduce relatively weak points in the structural material. In the present study, creep tests of a number of MarBN weld filler metals have been carried out to determine the effect of chemistry on the creep life of weld metal. The creep life of the weld metals was analysed, and the evolution of creep damage was investigated. Significant differences in the rupture life during creep have been observed as a function of boron, nitrogen and molybdenum concentrations in the weld consumable composition. Although the creep lives differed, the particle size and number in the failed creep tested specimens were similar, which indicates that there is a possible critical point for MarBN weld filler metal creep failure.
Funding
We would like to acknowledge the support of the Engineering and Physical Research Council (EPSRC) for their support for the project - Flexible and Efficient Power Plant: Flex-E-Plant (Grant number: EP/K021095/1). We also thank the following industrial partners for their the valuable contributions: GE energy, Doosan Babcock Limited, Centrica plc., EDF Energy (West Burton Power) Limited., Uniper Technology Limited, Goodwin Steel Castings Limited, NPL Management Limited, R-MC Power Recovery Limited., RWE Generation UK plc., Scottish and Southern Energy (SSE) plc., Siemens Industrial Turbomachinery, TWI Limited, Metrode Products Limited, NUI Galway and University of Limerick. We also acknowledge the support of the Loughborough Materials Characterisation Centre (LMCC).
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Materials
Published in
8th International Conference on Advances in Materials Technology for Fossil power PlantsCitation
GUO, J., JEPSON, M.A.E., and Thomson, R.C., 2016. Microstructural characterisation of creep tested 9CR welds for MarBN steel. IN: Parker, J., Shingledecker, J. and Siefert, J. (eds). Advances in Materials Technology for Fossil Power Plants, Proceedings from the Eight International Conference (EPRI 2016), Albufeira, Algarve, Portugal, 11-14 October 2016.Publisher
© Electric Power Research Institute (EPRI). Distributed by ASM InternationalVersion
- AM (Accepted Manuscript)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/Acceptance date
2016-07-22Publication date
2016Notes
This article is made available as an electronic reprint with the permission of ASM International for the Loughborough University Institutional Repository. Reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this article for a fee or for commercial purposes, or modification of the content of this article is prohibited.ISBN
978-1-62708-131-3Publisher version
Language
- en
